init

+//
+//  Fonts + Extension.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 02.06.2022.
+//
+
+import UIKit
+
+enum SkModernistFontType: String {
+    case bold = "Sk-Modernist-Bold"
+    case mono = "Sk-Modernist-Mono"
+    case regular = "Sk-Modernist-Regular"
+}
+
+extension UIFont {
+    static func roboto(type: SkModernistFontType, ofSize: CGFloat) -> UIFont {
+        if let font = UIFont(name: type.rawValue, size: ofSize) {
+            return font
+        } else {
+            fatalError("Font '\(type.rawValue)' does not exist.❌")
+        }
+    }
+}

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+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 17CF9ED52844ED8F000D8077 /* Project object */;
+}

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>InterQR-Internship.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>2</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:InterQR-Internship.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   uuid = "A8BBD599-A0D6-48C1-A109-6E95E235F42B"
+   type = "0"
+   version = "2.0">
+</Bucket>

+//
+//  AppDelegate.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 30.05.2022.
+//
+
+import UIKit
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+

+{
+  "images" : [
+    {
+      "filename" : "AUS.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

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+      "scale" : "2x",
+      "size" : "20x20"
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+      "scale" : "3x",
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+      "size" : "29x29"
+    },
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+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
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+      "idiom" : "iphone",
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+    },
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+    },
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+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
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+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
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+      "size" : "40x40"
+    },
+    {
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+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
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+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
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+    }
+  ],
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+}

+{
+  "images" : [
+    {
+      "filename" : "BackPointer.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Arrow - Left 2@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Arrow - Left 2@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "FlagPointer.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Stroke 1@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Stroke 1@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "GB.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "icons8-великобритания-48.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "icons8-великобритания-96.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "InterQR.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Group 33497-2.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Group 33497-3.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "Lock.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Lock@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Lock@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "OffIndicator.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Ellipse 1@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Ellipse 1@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "OnIndicator.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Group 1@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Group 1@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "Pointer.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Arrow - Right Circle@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "Arrow - Right Circle@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

+{
+  "images" : [
+    {
+      "filename" : "8D57D412-3800-4D7C-922A-FF392EC0594E_4_5005_c.jpeg",
+      "idiom" : "universal",
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+  ],
+  "info" : {
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+  }
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+{
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+      "filename" : "RectangleWithShadow.png",
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+    {
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+  }
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+{
+  "images" : [
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+      "filename" : "Shield.png",
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+    },
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+    {
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+  ],
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+{
+  "images" : [
+    {
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+  ],
+  "info" : {
+    "author" : "xcode",
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+  }
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+{
+  "images" : [
+    {
+      "filename" : "USA.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "Icons@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
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+      "filename" : "Icons@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

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+    </dependencies>
+    <scenes>
+        <!--View Controller-->
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+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

+//
+//  CodeVerificationViewController.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 03.06.2022.
+//
+
+import UIKit
+
+class CodeVerificationViewController: UIViewController {
+    
+    private let codeView = CodeVerificationView()
+    
+    override func loadView() {
+        view = codeView
+    }
+    
+    override func viewDidLoad() {
+        initViewController()
+    }
+    
+    private func initViewController() {
+        codeView.firstTextField.delegate = self
+        codeView.backButton.addTarget(self, action: #selector(didDismissVC), for: .touchUpInside)
+        codeView.verifyButton.addTarget(self, action: #selector(didVerifyCode), for: .touchUpInside)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
+    }
+    
+//    deinit {
+//        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
+//        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
+//    }
+}
+
+extension CodeVerificationViewController {
+    
+    @objc func didDismissVC() {
+        dismiss(animated: true, completion: nil)
+    }
+    
+    @objc func didVerifyCode() {
+        codeView.firstTextField.backgroundColor = UIColor(red: 255/255, green: 237/255, blue: 240/255, alpha: 1)
+        codeView.secondTextField.backgroundColor = UIColor(red: 255/255, green: 237/255, blue: 240/255, alpha: 1)
+        codeView.thirdTextField.backgroundColor = UIColor(red: 255/255, green: 237/255, blue: 240/255, alpha: 1)
+        codeView.fourthTextField.backgroundColor = UIColor(red: 255/255, green: 237/255, blue: 240/255, alpha: 1)
+        
+        codeView.firstTextField.textColor = UIColor(red: 255/255, green: 0/255, blue: 46/255, alpha: 1)
+        codeView.secondTextField.textColor = UIColor(red: 255/255, green: 0/255, blue: 46/255, alpha: 1)
+        codeView.thirdTextField.textColor = UIColor(red: 255/255, green: 0/255, blue: 46/255, alpha: 1)
+        codeView.fourthTextField.textColor = UIColor(red: 255/255, green: 0/255, blue: 46/255, alpha: 1)
+        
+        codeView.errorAlertLabel.isHidden = false
+    }
+    
+    @objc func keyboardWillShow(notification: NSNotification) {
+//        if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
+//            let keyboardHeight = keyboardFrame.cgRectValue.height
+//            //            let bottomSpace =
+//            if self.view.frame.origin.y == 0 {
+//                self.view.frame.origin.y -= keyboardFrame.height
+//            }
+        if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
+                if self.view.frame.origin.y == 0 {
+//                    self.view.frame.origin.y -= keyboardSize.height - 150
+                    codeView.containerView.frame.origin.y -= keyboardSize.height - 150
+                    codeView.shieldImage.frame.origin.x += view.frame.origin.x + 100
+                }
+        }
+    }
+    
+    @objc func keyboardWillHide() {
+        if self.view.frame.origin.y != 0 {
+                self.view.frame.origin.y = 0
+            }
+    }
+    
+}
+
+extension CodeVerificationViewController: UITextFieldDelegate {
+    
+    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
+
+        true
+    }
+}

+//
+//  ViewController.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 30.05.2022.
+//
+
+import UIKit
+
+class VerificationViewController: UIViewController {
+    
+    var isKeyboardAppear = false
+    private let mainView = VerificationView()
+    
+    lazy var phonePickerModels: [PhonePickerModel] = {
+        var models: [PhonePickerModel] = []
+        
+        for (code, value) in PhoneService.phones
+        {
+            models.append(.init(code: code, countryCode: value.1, title: value.0, icon: value.2))
+        }
+        return models
+    }()
+    
+    override func loadView() {
+        view = mainView
+    }
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        initViewController()
+    }
+    
+    
+    private func initViewController() {
+        mainView.phonePickerView.phoneNumberPicker.delegate = self
+        mainView.phonePickerView.phoneNumberPicker.dataSource = self
+        mainView.showPickerButton.addTarget(self, action: #selector(didshowPickerButtonTapped(_:)), for: .touchUpInside)
+        mainView.phonePickerView.selectButton.addTarget(self, action: #selector(didshowPickerButtonTapped(_:)), for: .touchUpInside)
+        mainView.phonePickerView.titleButton.addTarget(self, action: #selector(didshowPickerButtonTapped(_:)), for: .touchDragInside)
+        mainView.continueButton.addTarget(self, action: #selector(didShowCodeVerificationVC), for: .touchUpInside)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
+    }
+    
+}
+
+//MARK: targets
+extension VerificationViewController {
+    //    @objc private func didRadioButtonTapped(_ sender: UIButton) {
+    //        switch sender {
+    //        case mainView.phoneNumberButton :
+    //            mainView.emailButton.isSelected = false
+    //            mainView.phoneNumberButton.isSelected = true
+    ////            mainView.phonymberTextField.isHidden = false
+    ////            mainView.emailTextField.isHidden = true
+    //        case mainView.emailButton:
+    //            mainView.emailButton.isSelected = true
+    //            mainView.phoneNumberButton.isSelected = false
+    //        default:
+    //            return
+    //        }
+    //    }
+    
+    @objc private func didshowPickerButtonTapped(_ sender: UIButton) {
+        mainView.isShow ? mainView.showPickerView() : mainView.hidePicerView()
+        mainView.isShow.toggle()
+    }
+    
+    @objc private func didShowCodeVerificationVC() {
+        let vc = CodeVerificationViewController()
+        vc.modalPresentationStyle = .fullScreen
+        present(vc, animated: true)
+    }
+    
+    @objc func keyboardWillShow(notification: NSNotification) {
+        //        if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
+        //            let keyboardHeight = keyboardFrame.cgRectValue.height
+        //            //            let bottomSpace =
+        //            if self.view.frame.origin.y == 0 {
+        //                self.view.frame.origin.y -= keyboardFrame.height
+        //            }
+        //        if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
+        //            if self.view.frame.origin.y == 0 {
+        //                    self.view.frame.origin.y -= keyboardSize.height - 150
+        //                mainView.phoneTextField.frame.origin.y -= 60
+        //                mainView.enterChosenAuthenticatorLabel.frame.origin.y -= 60
+        //                    codeView.shieldImage.frame.origin.x += view.frame.origin.x + 100
+        if !isKeyboardAppear {
+            
+            if mainView.phoneTextField.frame.origin.y == mainView.phoneTextField.frame.origin.y && mainView.enterChosenAuthenticatorLabel.frame.origin.y == mainView.enterChosenAuthenticatorLabel.frame.origin.y{
+                mainView.phoneTextField.frame.origin.y -= 100
+                mainView.emailTextField.frame.origin.y -= 100
+                mainView.enterChosenAuthenticatorLabel.frame.origin.y -= 100
+                mainView.chooseLabel.frame.origin.y -= 80
+                mainView.emailButton.frame.origin.y -= 80
+                mainView.phoneNumberButton.frame.origin.y -= 80
+                mainView.dividingLineView.frame.origin.y -= 80
+            }
+            
+            isKeyboardAppear = true
+        }
+        //            }
+        //        }
+    }
+    
+    @objc func keyboardWillHide(notification: NSNotification) {
+        
+        if isKeyboardAppear {
+            
+            if mainView.phoneTextField.frame.origin.y != 0 && mainView.enterChosenAuthenticatorLabel.frame.origin.y != 0{
+                mainView.phoneTextField.frame.origin.y += 100
+                mainView.emailTextField.frame.origin.y += 100
+                mainView.enterChosenAuthenticatorLabel.frame.origin.y += 100
+                mainView.chooseLabel.frame.origin.y += 80
+                mainView.emailButton.frame.origin.y += 80
+                mainView.phoneNumberButton.frame.origin.y += 80
+                mainView.dividingLineView.frame.origin.y += 80
+            }
+            
+            
+            isKeyboardAppear = false
+        }
+        //        mainView.phoneTextField.frame.origin.y += 60
+        //        mainView.enterChosenAuthenticatorLabel.frame.origin.y += 60
+        
+    }
+}
+
+//MARK: table view delegate and datasource
+extension VerificationViewController {
+    
+}
+
+extension VerificationViewController: UIPickerViewDataSource, UIPickerViewDelegate {
+    
+    func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 }
+    
+    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
+        return phonePickerModels.count
+        
+    }
+    
+    func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
+        60
+    }
+    
+    //    func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
+    //        return 130.0
+    //    }
+    
+    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
+        let model = phonePickerModels[row]
+        return PickerView.create(icon: model.icon, title: model.title, code: model.countryCode)
+    }
+    
+    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
+        pickerView.subviews[1].backgroundColor = .clear
+        let model = phonePickerModels[row]
+        mainView.phoneTextField.text = "\(model.countryCode)"
+        mainView.flagPickerView.image = model.icon
+    }
+}
+

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIAppFonts</key>
+	<array>
+		<string>Sk-Modernist-Bold.otf</string>
+		<string>Sk-Modernist-Mono.otf</string>
+		<string>Sk-Modernist-Regular.otf</string>
+	</array>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+</dict>
+</plist>

+//
+//  PhonePickerModel.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 31.05.2022.
+//
+
+import Foundation
+import UIKit
+
+struct PhonePickerModel {
+    
+    let code: String
+    let countryCode: String
+    let title: String
+    let icon: UIImage
+}

+//
+//  PhoneService.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 31.05.2022.
+//
+
+import Foundation
+import UIKit
+
+class PhoneService {
+    static var phones: [String: (String, String, UIImage)] = {
+        var codes = [String: (String, String, UIImage)] ()
+        codes["USA"] = ("United States", "+1", UIImage(named: "USA") ?? UIImage())
+        codes["GB"] = ("Great Britain", "+123", UIImage(named: "GB") ?? UIImage())
+        codes["AUS"] = ("Australia", "+12", UIImage(named: "AUS") ?? UIImage())
+       return codes
+    }()
+}

+//
+//  SceneDelegate.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 30.05.2022.
+//
+
+import UIKit
+import SnapKit
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+    
+    var window: UIWindow?
+    
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+        
+        guard let windowScene = (scene as? UIWindowScene) else { return }
+        window = UIWindow(windowScene: windowScene)
+        let viewController = VerificationViewController()
+        let navigation = UINavigationController(rootViewController: viewController)
+        window?.rootViewController = navigation
+        window?.makeKeyAndVisible()
+    }
+}
+

+//
+//  CodeVerificationView.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 03.06.2022.
+//
+
+import UIKit
+
+class CodeVerificationView: UIView {
+    
+    var containerView: UIView = {
+        var obj = UIView()
+        return obj
+    }()
+    var backButton: UIButton = {
+        var obj = UIButton()
+        obj.setImage(UIImage(named: "BackPointer"), for: .normal)
+        obj.backgroundColor = .white
+        obj.layer.borderColor = UIColor(red: 224/255, green: 231/255, blue: 232/255, alpha: 1).cgColor
+        obj.layer.cornerRadius = 13
+        obj.layer.borderWidth = 1
+        return obj
+    }()
+    var logoImage: UIImageView = {
+        var obj = UIImageView()
+        obj.image = UIImage(named: "InterQR")
+        return obj
+    }()
+    var shieldImage: UIImageView = {
+        var obj = UIImageView()
+        obj.image = UIImage(named: "Lock")
+        return obj
+    }()
+    var descriptionLabel: UILabel = {
+        var obj = UILabel()
+        obj.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 35)
+        obj.text = "Enter your\nverification code"
+        obj.numberOfLines = 2
+        return obj
+    }()
+    var firstTextField: UITextField = {
+        var obj = UITextField()
+        obj.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        obj.layer.cornerRadius = 15
+        obj.keyboardType = .numberPad
+        obj.textAlignment = .center
+        obj.textContentType = .oneTimeCode
+        obj.becomeFirstResponder()
+        return obj
+    }()
+    var secondTextField: UITextField = {
+        var obj = UITextField()
+        obj.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        obj.layer.cornerRadius = 15
+        obj.keyboardType = .numberPad
+        obj.textAlignment = .center
+        obj.textContentType = .oneTimeCode
+        obj.isEnabled = false
+        return obj
+    }()
+    var thirdTextField: UITextField = {
+        var obj = UITextField()
+        obj.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        obj.layer.cornerRadius = 15
+        obj.keyboardType = .numberPad
+        obj.textAlignment = .center
+        obj.textContentType = .oneTimeCode
+        obj.isEnabled = false
+        return obj
+    }()
+    var fourthTextField: UITextField = {
+        var obj = UITextField()
+        obj.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        obj.layer.cornerRadius = 15
+        obj.keyboardType = .numberPad
+        obj.textAlignment = .center
+        obj.textContentType = .oneTimeCode
+        obj.isEnabled = false
+        return obj
+    }()
+    var errorAlertLabel: UILabel = {
+        var obj = UILabel()
+        obj.text = "Please, enter valid verification code"
+        obj.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 14)
+        obj.textColor = UIColor(red: 255/255, green: 0/255, blue: 46/255, alpha: 1)
+        obj.isHidden = true
+        return obj
+    }()
+    var verifyButton: UIButton = {
+        var obj = UIButton()
+        obj.setImage(UIImage(named: "RectangleWithShadow"), for: .normal)
+        return obj
+    }()
+    var verifyLabel: UILabel = {
+        var obj = UILabel()
+        obj.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 16)
+        obj.textColor = .white
+        obj.text = "Verify"
+        return obj
+    }()
+    var tickImage: UIImageView = {
+        var obj = UIImageView()
+        obj.image = UIImage(named: "Tick")
+        return obj
+    }()
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        layout()
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func layout() {
+        backgroundColor = .white
+        addSubview(backButton)
+        addSubview(logoImage)
+        addSubview(shieldImage)
+        addSubview(containerView)
+        containerView.addSubview(descriptionLabel)
+        containerView.addSubview(firstTextField)
+        containerView.addSubview(secondTextField)
+        containerView.addSubview(thirdTextField)
+        containerView.addSubview(fourthTextField)
+        containerView.addSubview(errorAlertLabel)
+        containerView.addSubview(verifyButton)
+        verifyButton.addSubview(verifyLabel)
+        verifyButton.addSubview(tickImage)
+        
+        backButton.snp.makeConstraints {
+            $0.top.equalTo(snp.top).offset(66)
+            $0.leading.equalTo(snp.leading).offset(22)
+            $0.height.width.equalTo(45)
+        }
+        logoImage.snp.makeConstraints {
+            $0.leading.equalTo(backButton.snp.trailing).offset(20)
+            $0.centerY.equalTo(backButton)
+        }
+        shieldImage.snp.makeConstraints {
+            $0.top.equalTo(backButton.snp.bottom).offset(25)
+            $0.centerX.equalTo(snp.centerX)
+        }
+        containerView.snp.makeConstraints {
+            $0.top.equalTo(shieldImage.snp.bottom).offset(41)
+            $0.leading.trailing.equalToSuperview()
+            $0.height.equalTo(300)
+        }
+        descriptionLabel.snp.makeConstraints {
+            $0.leading.equalTo(containerView.snp.leading).offset(20)
+            $0.top.equalTo(containerView.snp.top)
+        }
+        firstTextField.snp.makeConstraints {
+            $0.leading.equalTo(containerView.snp.leading).offset(25)
+            $0.top.equalTo(descriptionLabel.snp.bottom).offset(28)
+            $0.height.equalTo(55)
+        }
+        secondTextField.snp.makeConstraints {
+            $0.leading.equalTo(firstTextField.snp.trailing).offset(12)
+            $0.centerY.equalTo(firstTextField)
+            $0.width.equalTo(firstTextField.snp.width)
+            $0.height.equalTo(55)
+        }
+        thirdTextField.snp.makeConstraints {
+            $0.leading.equalTo(secondTextField.snp.trailing).offset(12)
+            $0.centerY.equalTo(firstTextField)
+            $0.width.equalTo(firstTextField.snp.width)
+            $0.height.equalTo(55)
+        }
+        fourthTextField.snp.makeConstraints {
+            $0.leading.equalTo(thirdTextField.snp.trailing).offset(12)
+            $0.centerY.equalTo(firstTextField)
+            $0.trailing.equalTo(containerView.snp.trailing).offset(-25)
+            $0.width.equalTo(firstTextField.snp.width)
+            $0.height.equalTo(55)
+        }
+        errorAlertLabel.snp.makeConstraints {
+            $0.top.equalTo(firstTextField.snp.bottom).offset(8)
+            $0.leading.equalTo(firstTextField.snp.leading)
+        }
+        verifyButton.snp.makeConstraints {
+            $0.top.equalTo(firstTextField.snp.bottom).offset(67)
+            $0.left.right.equalToSuperview()
+        }
+        verifyLabel.snp.makeConstraints {
+            $0.left.equalToSuperview().offset(49)
+            $0.top.equalToSuperview().offset(22)
+        }
+        tickImage.snp.makeConstraints {
+            $0.right.equalToSuperview().offset(-47)
+            $0.centerY.equalTo(verifyLabel)
+        }
+    }
+}

+//
+//  PhoneNumberView.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 31.05.2022.
+//
+
+import UIKit
+import CoreTelephony
+
+class PhoneNumberView: UIView {
+    
+    var containerPickerView: UIView = {
+        var view = UIView()
+        view.backgroundColor = .systemRed
+        return view
+    }()
+    
+    var titleButton: UIButton = {
+        var obj = UIButton()
+        obj.setTitle("Select your country", for: .normal)
+        obj.setTitleColor(UIColor(red: 50/255, green: 55/255, blue: 85/255, alpha: 1), for: .normal)
+        obj.titleLabel?.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 18)
+        obj.titleLabel?.textAlignment = .center
+        return obj
+    }()
+    
+    var dividingLineView: UIView = {
+        var view = UIView()
+        view.backgroundColor = UIColor(red: 246/255, green: 246/255, blue: 246/255, alpha: 1)
+        return view
+    }()
+    
+    var phoneNumberPicker: UIPickerView = {
+        var picker = UIPickerView()
+        return picker
+    }()
+    
+    var selectButton: UIButton = {
+        var button = UIButton()
+        
+        button.backgroundColor = UIColor(red: 2/255, green: 115/255, blue: 185/255, alpha: 1)
+        button.clipsToBounds = true
+        
+        return button
+    }()
+    
+    var selectLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Select"
+        label.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 16)
+        label.textColor = .white
+        return label
+    }()
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        layout()
+        setup()
+        backgroundColor = .white
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func layout() {
+        self.backgroundColor  = .white
+        addSubview(titleButton)
+        addSubview(dividingLineView)
+        addSubview(phoneNumberPicker)
+        addSubview(selectButton)
+        
+        selectButton.addSubview(selectLabel)
+        
+        titleButton.snp.makeConstraints { make in
+            make.top.equalToSuperview().offset(20)
+            make.leading.trailing.equalToSuperview()
+        }
+        
+        dividingLineView.snp.makeConstraints {
+            $0.left.right.equalToSuperview()
+            $0.height.equalTo(1)
+            $0.top.equalTo(titleButton.snp.bottom).offset(22)
+        }
+        phoneNumberPicker.snp.makeConstraints {
+            $0.left.right.equalToSuperview().inset(5)
+            $0.top.equalTo(dividingLineView.snp.bottom).offset(20)
+        }
+        selectButton.snp.makeConstraints {
+            $0.right.equalToSuperview()
+            $0.left.equalToSuperview()
+            $0.bottom.equalToSuperview()
+            $0.height.equalTo(70)
+            $0.top.equalTo(phoneNumberPicker.snp.bottom).offset(20)
+        }
+        selectLabel.snp.makeConstraints {
+            $0.centerX.equalTo(selectButton.snp.centerX)
+            $0.top.equalTo(selectButton.snp.top).offset(20)
+        }
+    }
+}
+
+extension PhoneNumberView {
+    
+    func setup() {
+        
+        let countryCode: String
+        if let carrier = CTTelephonyNetworkInfo().serviceSubscriberCellularProviders?.first?.value,
+           let code = carrier.isoCountryCode?.uppercased() {
+            countryCode = code
+        } else {
+            countryCode = "USA"
+        }
+        
+        phoneNumberPicker.selectRow(0, inComponent: 0, animated: true)
+        
+        phoneNumberPicker.subviews[1].backgroundColor = .clear
+        
+    }
+}
+

+//
+//  PickerView.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 01.06.2022.
+//
+
+import UIKit
+
+final class PickerView: UIView {
+    
+    private let iconView: UIImageView = {
+        var obj = UIImageView()
+        obj.contentMode = .scaleAspectFill
+        obj.layer.cornerRadius = 10
+        return obj
+    }()
+    private let label: UILabel = {
+        var obj = UILabel()
+        obj.textColor = UIColor(red: 50/255, green: 55/255, blue: 85/255, alpha: 1)
+        obj.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 15)
+        return obj
+    }()
+    private let countryCode: UILabel = {
+        var obj = UILabel()
+        obj.textColor = UIColor(red: 50/255, green: 55/255, blue: 85/255, alpha: 1)
+        obj.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 15)
+        return obj
+    }()
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        layout()
+    }
+    
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+        layout()
+    }
+    
+    private func layout() {
+        addSubview(iconView)
+        addSubview(label)
+        addSubview(countryCode)
+        
+        iconView.snp.makeConstraints { make in
+            make.leading.equalToSuperview().offset(25)
+            make.centerY.equalTo(snp.centerY)
+//            make.top.bottom.equalToSuperview()
+            make.height.width.equalTo(20)
+        }
+        
+        label.snp.makeConstraints { make in
+            make.leading.equalTo(iconView.snp.trailing).offset(20)
+            make.top.bottom.equalToSuperview()
+        }
+        
+        countryCode.snp.makeConstraints { make in
+            make.trailing.equalToSuperview().offset(-25)
+            make.top.bottom.equalToSuperview()
+        }
+    }
+    
+    static func create(icon: UIImage, title: String, code: String) -> PickerView {
+        let numberView = PickerView()
+        numberView.iconView.image = icon
+        numberView.label.text = title
+        numberView.countryCode.text = code
+        return numberView
+    }
+}

+//
+//  TextFieldWithPadding.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 01.06.2022.
+//
+
+import UIKit
+
+class TextFieldWithPadding: UITextField {
+    
+    var textPaddingForEmail = UIEdgeInsets(
+        top: 0,
+        left: 22,
+        bottom: 0,
+        right: 22
+    )
+    var textPaddingForPhone = UIEdgeInsets(
+        top: 0,
+        left: 78,
+        bottom: 0,
+        right: 22
+    )
+    
+    override func textRect(forBounds bounds: CGRect) -> CGRect {
+        let rect = super.textRect(forBounds: bounds)
+        return rect.inset(by: textPaddingForPhone)
+    }
+
+    override func editingRect(forBounds bounds: CGRect) -> CGRect {
+        let rect = super.editingRect(forBounds: bounds)
+        return rect.inset(by: textPaddingForPhone)
+    }
+}

+//
+//  VerificationView.swift
+//  InterQR-Internship
+//
+//  Created by Дмитрий Тимофеев on 30.05.2022.
+//
+
+import Foundation
+import UIKit
+
+class VerificationView: UIView {
+    
+    var isShow: Bool = false
+    
+    var logoImage: UIImageView = {
+        var view = UIImageView()
+        view.image = UIImage(named: "InterQR")
+        return view
+    }()
+    var greetingsLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Hello"
+        label.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 35)
+        return label
+    }()
+    var verifyLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Lets verify your \naccount"
+        label.numberOfLines = 2
+        label.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 28)
+        return label
+    }()
+    var shieldImage: UIImageView = {
+        var view = UIImageView()
+        view.image = UIImage(named: "Shield")
+        return view
+    }()
+    var chooseLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Choose what to start with"
+        label.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 16)
+        label.font = .systemFont(ofSize: 16, weight: .bold)
+        return label
+    }()
+    var emailButton: UIButton = {
+        var button = UIButton()
+        button.setTitle("Email", for: .normal)
+        button.setTitleColor(UIColor(red: 50/255, green: 55/255, blue: 85/255, alpha: 1), for: .normal)
+        button.setTitleColor(UIColor(red: 185/255, green: 185/255, blue: 185/255, alpha: 1), for: .disabled)
+        button.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 14)
+        button.titleEdgeInsets = UIEdgeInsets(top: 0, left: 14, bottom: 0, right: 0)
+        button.setImage(UIImage(named: "OnIndicator"), for: .normal)
+        button.setImage(UIImage(named: "OffIndicator"), for: .selected)
+        button.contentMode = .left
+        return button
+    }()
+//    var emailIndicatorImage: UIImageView = {
+//        var image = UIImageView()
+//        image.image = UIImage(named: "OnIndicator")
+//        return image
+//    }()
+    var phoneNumberButton: UIButton = {
+        var button = UIButton()
+        button.setTitle("Phone Number", for: .normal)
+        button.setTitleColor(UIColor(red: 50/255, green: 55/255, blue: 85/255, alpha: 1), for: .normal)
+        button.setTitleColor(UIColor(red: 185/255, green: 185/255, blue: 185/255, alpha: 1), for: .disabled)
+        button.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 14)
+        button.titleEdgeInsets = UIEdgeInsets(top: 0, left: 14, bottom: 0, right: 10)
+        button.setImage(UIImage(named: "OnIndicator"), for: .selected)
+        button.setImage(UIImage(named: "OffIndicator"), for: .normal)
+        return button
+    }()
+//    var phoneNumberIndicatorImage: UIImageView = {
+//        var image = UIImageView()
+//        image.image = UIImage(named: "OffIndicator")
+//        return image
+//    }()
+//    var pickEmailLabel: UILabel = {
+//        var label = UILabel()
+//        label.text = "Email"
+//        label.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 15)
+//        return label
+//    }()
+//    var pickPhoneLabel: UILabel = {
+//        var label = UILabel()
+//        label.text = "Phone Number"
+//        label.textColor = UIColor(red: 185/255, green: 185/255, blue: 185/255, alpha: 1)
+//        label.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 15)
+//        return label
+//    }()
+    var dividingLineView: UIView = {
+        var view = UIView()
+        view.backgroundColor = UIColor(red: 246/255, green: 246/255, blue: 246/255, alpha: 1)
+        return view
+    }()
+    var enterChosenAuthenticatorLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Enter your email address"
+        label.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 16)
+        return label
+    }()
+    var emailTextField: UITextField = {
+        var textField = UITextField()
+        textField.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        textField.textAlignment = .left
+        textField.layer.cornerRadius = 15
+        textField.keyboardType = .emailAddress
+        textField.placeholder = "Example: john.doe@gmail.com"
+        textField.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 15)
+        textField.layer.masksToBounds = true
+        textField.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 22, height: textField.frame.height))
+        textField.leftViewMode = .always
+        return textField
+    }()
+    var phoneTextField: TextFieldWithPadding = {
+        var textField = TextFieldWithPadding()
+        textField.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)
+        textField.textAlignment = .left
+        textField.layer.cornerRadius = 15
+        textField.keyboardType = .numberPad
+        textField.text = "+1"
+        textField.font = UIFont(name: SkModernistFontType.regular.rawValue, size: 15)
+        textField.layer.masksToBounds = true
+        textField.isHidden = true
+        return textField
+    }()
+    var verificationDescriptionLabel: UILabel = {
+        var label = UILabel()
+        label.numberOfLines = 0
+        label.text = "Verification code will be sent to your e-mail"
+        label.font = UIFont(name: "Sk-Modernist", size: 14)
+        label.font = .systemFont(ofSize: 14, weight: .regular)
+        return label
+    }()
+    var continueButton: UIButton = {
+        var button = UIButton()
+        button.setImage(UIImage(named: "RectangleWithShadow"), for: .normal)
+        button.clipsToBounds = true
+        button.contentMode = .scaleAspectFit
+        button.layer.cornerRadius = 15
+        return button
+    }()
+    var continueLabel: UILabel = {
+        var label = UILabel()
+        label.text = "Continue"
+        label.font = UIFont(name: SkModernistFontType.bold.rawValue, size: 16)
+        label.textColor = .white
+        return label
+    }()
+    var pointerImage: UIImageView = {
+        var image = UIImageView()
+        image.image = UIImage(named: "Pointer")
+        return image
+    }()
+    var phonePickerView: PhoneNumberView = {
+        var view = PhoneNumberView()
+        view.isUserInteractionEnabled = true
+        return view
+    }()
+    var showPickerButton: UIButton = {
+        var button = UIButton()
+        button.isHidden = true
+        return button
+    }()
+    var flagPickerView: UIImageView = {
+        var image = UIImageView()
+        image.image = UIImage(named: "USA")
+        image.layer.cornerRadius = 11
+        image.contentMode = .scaleAspectFit
+        return image
+    }()
+    var flagPointerView: UIImageView = {
+        var image = UIImageView()
+        image.image = UIImage(named: "FlagPointer")
+        return image
+    }()
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        backgroundColor = .white
+        layout()
+        phoneNumberButton.addTarget(self, action: #selector(choosePhoneCode), for: .touchUpInside)
+        emailButton.addTarget(self, action: #selector(chooseEmail), for: .touchUpInside)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func layout() {
+        
+        addSubview(logoImage)
+        addSubview(greetingsLabel)
+        addSubview(verifyLabel)
+        addSubview(shieldImage)
+        
+        addSubview(chooseLabel)
+        addSubview(emailButton)
+        addSubview(phoneNumberButton)
+//        phoneNumberButton.addSubview(pickPhoneLabel)
+//        phoneNumberButton.addSubview(phoneNumberIndicatorImage)
+        addSubview(dividingLineView)
+        
+        addSubview(enterChosenAuthenticatorLabel)
+        addSubview(emailTextField)
+        addSubview(phoneTextField)
+        addSubview(verificationDescriptionLabel)
+        phoneTextField.addSubview(showPickerButton)
+        
+        showPickerButton.addSubview(flagPickerView)
+        showPickerButton.addSubview(flagPointerView)
+        
+        addSubview(continueButton)
+        continueButton.addSubview(continueLabel)
+        continueButton.addSubview(pointerImage)
+        
+        addSubview(phonePickerView)
+        
+        logoImage.snp.makeConstraints {
+            $0.top.equalTo(snp.top).offset(80)
+            $0.left.equalTo(snp.left).offset(27)
+        }
+        greetingsLabel.snp.makeConstraints {
+            $0.top.equalTo(logoImage.snp.bottom).offset(42)
+            $0.left.equalTo(snp.left).offset(24)
+        }
+        shieldImage.snp.makeConstraints {
+            $0.right.equalToSuperview()
+            $0.top.equalTo(logoImage.snp.bottom).offset(27)
+        }
+        verifyLabel.snp.makeConstraints {
+            $0.left.equalTo(27)
+            $0.top.equalTo(greetingsLabel.snp.bottom).offset(10)
+        }
+        chooseLabel.snp.makeConstraints {
+            $0.top.equalTo(shieldImage.snp.bottom).offset(52)
+            $0.left.equalTo(snp.left).offset(27)
+        }
+        emailButton.snp.makeConstraints {
+            $0.left.equalTo(snp.left).offset(27)
+            $0.top.equalTo(chooseLabel.snp.bottom).offset(29)
+            $0.height.equalTo(20)
+        }
+        phoneNumberButton.snp.makeConstraints {
+            $0.top.equalTo(emailButton.snp.top)
+            $0.height.equalTo(20)
+            $0.left.equalTo(snp.left).offset(144)
+        }
+        dividingLineView.snp.makeConstraints {
+            $0.left.right.equalToSuperview()
+            $0.top.equalTo(emailButton.snp.bottom).offset(41)
+            $0.height.equalTo(1)
+        }
+        enterChosenAuthenticatorLabel.snp.makeConstraints {
+            $0.top.equalTo(dividingLineView.snp.bottom).offset(39)
+            $0.left.equalTo(logoImage.snp.left)
+        }
+        emailTextField.snp.makeConstraints {
+            $0.left.equalTo(logoImage.snp.left)
+            $0.right.equalTo(snp.right).offset(-27)
+            $0.top.equalTo(enterChosenAuthenticatorLabel.snp.bottom).offset(23)
+            $0.height.equalTo(57)
+        }
+        phoneTextField.snp.makeConstraints {
+            $0.left.equalTo(logoImage.snp.left)
+            $0.right.equalTo(snp.right).offset(-27)
+            $0.top.equalTo(enterChosenAuthenticatorLabel.snp.bottom).offset(23)
+            $0.height.equalTo(57)
+        }
+        verificationDescriptionLabel.snp.makeConstraints {
+            $0.top.equalTo(emailTextField.snp.bottom).offset(8)
+            $0.left.equalTo(snp.left).offset(46)
+            $0.right.equalTo(snp.right).offset(-22)
+        }
+        continueButton.snp.makeConstraints {
+            $0.left.equalTo(snp.left)
+            $0.right.equalTo(snp.right)
+            $0.top.equalTo(emailTextField.snp.bottom).offset(90)
+            $0.height.equalTo(125)
+        }
+        continueLabel.snp.makeConstraints {
+            $0.left.equalTo(snp.left).offset(48)
+            $0.top.equalTo(continueButton.snp.top).offset(33)
+        }
+        pointerImage.snp.makeConstraints {
+            $0.top.equalTo(continueButton.snp.top).offset(31)
+            $0.right.equalTo(snp.right).offset(-51.5)
+        }
+        phonePickerView.snp.makeConstraints { make in
+            make.leading.trailing.equalToSuperview()
+            make.height.equalTo(390)
+            make.top.equalTo(self.snp.bottom)
+        }
+        showPickerButton.snp.makeConstraints {
+            $0.height.equalTo(22)
+            $0.width.equalTo(50)
+            $0.left.equalTo(emailTextField.snp.left).offset(22)
+            $0.top.equalTo(emailTextField.snp.top).offset(18)
+        }
+        flagPickerView.snp.makeConstraints {
+            $0.left.equalToSuperview()
+            $0.top.equalToSuperview()
+            $0.height.width.equalTo(20)
+            $0.centerY.equalTo(showPickerButton.snp.centerY)
+        }
+        flagPointerView.snp.makeConstraints {
+            $0.left.equalTo(flagPickerView.snp.right).offset(10)
+            $0.centerYWithinMargins.equalTo(flagPickerView.snp.centerYWithinMargins)
+        }
+    }
+    
+    @objc func choosePhoneCode() {
+        emailTextField.isHidden = true
+        phoneTextField.isHidden = false
+        phoneNumberButton.isSelected = true
+        emailButton.isSelected = true
+//        phoneNumberButton.setImage(UIImage(named: "OnIndicator"), for: .normal)
+//        emailButton.setImage(UIImage(named: "OffIndicator"), for: .normal)
+        phoneNumberButton.image(for: .normal)
+        verificationDescriptionLabel.text = "Verification code will be sent to\nyour phone number"
+        enterChosenAuthenticatorLabel.text = "Enter your phone number"
+        emailTextField.text = "+1"
+        showPickerButton.isHidden = false
+        emailTextField.keyboardType = .numberPad
+    }
+    
+    @objc func chooseEmail() {
+        emailTextField.isHidden = false
+        phoneTextField.isHidden = true
+        phoneNumberButton.isSelected = false
+        emailButton.isSelected = false
+        verificationDescriptionLabel.text = "Verification code will be sent to your e-mail"
+        enterChosenAuthenticatorLabel.text = "Enter your email address"
+        emailTextField.text = ""
+        emailTextField.placeholder = "Example: john.doe@gmail.com"
+        showPickerButton.isHidden = true
+    }
+    
+    func showPickerView() {
+        UIView.animate(withDuration: 0.3) {
+            self.phonePickerView.snp.updateConstraints { make in
+                make.top.equalTo(self.snp.bottom).offset(-390)
+                
+            }
+            self.layoutIfNeeded()
+        }
+        
+    }
+    
+    func hidePicerView() {
+        UIView.animate(withDuration: 0.3) {
+            self.phonePickerView.snp.updateConstraints { make in
+                make.top.equalTo(self.snp.bottom).offset(0)
+            }
+            self.layoutIfNeeded()
+        }
+    }
+}

+# Uncomment the next line to define a global platform for your project
+# platform :ios, '9.0'
+
+target 'InterQR-Internship' do
+  # Comment the next line if you don't want to use dynamic frameworks
+  use_frameworks!
+
+  # Pods for InterQR-Internship
+pod 'SnapKit'
+end

+PODS:
+  - SnapKit (5.0.1)
+
+DEPENDENCIES:
+  - SnapKit
+
+SPEC REPOS:
+  trunk:
+    - SnapKit
+
+SPEC CHECKSUMS:
+  SnapKit: 97b92857e3df3a0c71833cce143274bf6ef8e5eb
+
+PODFILE CHECKSUM: 643937202fe849949514cc29f57e4f525190f02e
+
+COCOAPODS: 1.11.2

+PODS:
+  - SnapKit (5.0.1)
+
+DEPENDENCIES:
+  - SnapKit
+
+SPEC REPOS:
+  trunk:
+    - SnapKit
+
+SPEC CHECKSUMS:
+  SnapKit: 97b92857e3df3a0c71833cce143274bf6ef8e5eb
+
+PODFILE CHECKSUM: 643937202fe849949514cc29f57e4f525190f02e
+
+COCOAPODS: 1.11.2

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+Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

+<img src="http://snapkit.io/images/banner.jpg" alt="" />
+
+SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
+
+[![Build Status](https://travis-ci.org/SnapKit/SnapKit.svg)](https://travis-ci.org/SnapKit/SnapKit)
+[![Platform](https://img.shields.io/cocoapods/p/SnapKit.svg?style=flat)](https://github.com/SnapKit/SnapKit)
+[![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+
+#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️ 
+#### ⚠️ **To use with Swift 5.x please ensure you are using >= 5.0.0** ⚠️ 
+
+## Contents
+
+- [Requirements](#requirements)
+- [Migration Guides](#migration-guides)
+- [Communication](#communication)
+- [Installation](#installation)
+- [Usage](#usage)
+- [Credits](#credits)
+- [License](#license)
+
+## Requirements
+
+- iOS 10.0+ / Mac OS X 10.12+ / tvOS 10.0+
+- Xcode 10.0+
+- Swift 4.0+
+
+## Communication
+
+- If you **need help**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/snapkit). (Tag 'snapkit')
+- If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/snapkit).
+- If you **found a bug**, open an issue.
+- If you **have a feature request**, open an issue.
+- If you **want to contribute**, submit a pull request.
+
+
+## Installation
+
+### CocoaPods
+
+[CocoaPods](http://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:
+
+```bash
+$ gem install cocoapods
+```
+
+> CocoaPods 1.1.0+ is required to build SnapKit 4.0.0+.
+
+To integrate SnapKit into your Xcode project using CocoaPods, specify it in your `Podfile`:
+
+```ruby
+source 'https://github.com/CocoaPods/Specs.git'
+platform :ios, '10.0'
+use_frameworks!
+
+target '<Your Target Name>' do
+    pod 'SnapKit', '~> 5.0.0'
+end
+```
+
+Then, run the following command:
+
+```bash
+$ pod install
+```
+
+### Carthage
+
+[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.
+
+You can install Carthage with [Homebrew](http://brew.sh/) using the following command:
+
+```bash
+$ brew update
+$ brew install carthage
+```
+
+To integrate SnapKit into your Xcode project using Carthage, specify it in your `Cartfile`:
+
+```ogdl
+github "SnapKit/SnapKit" ~> 5.0.0
+```
+
+Run `carthage update` to build the framework and drag the built `SnapKit.framework` into your Xcode project.
+
+### Manually
+
+If you prefer not to use either of the aforementioned dependency managers, you can integrate SnapKit into your project manually.
+
+---
+
+## Usage
+
+### Quick Start
+
+```swift
+import SnapKit
+
+class MyViewController: UIViewController {
+
+    lazy var box = UIView()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        self.view.addSubview(box)
+        box.snp.makeConstraints { (make) -> Void in
+           make.width.height.equalTo(50)
+           make.center.equalTo(self.view)
+        }
+    }
+
+}
+```
+
+### Playground
+You can try SnapKit in Playground.
+
+**Note:**
+
+> To try SnapKit in playground, open `SnapKit.xcworkspace` and build SnapKit.framework for any simulator first.
+
+### Resources
+
+- [Documentation](http://snapkit.io/docs/)
+- [F.A.Q.](http://snapkit.io/faq/)
+
+## Credits
+
+- Robert Payne ([@robertjpayne](https://twitter.com/robertjpayne))
+- Many other contributors
+
+## License
+
+SnapKit is released under the MIT license. See LICENSE for details.

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+public final class Constraint {
+
+    internal let sourceLocation: (String, UInt)
+    internal let label: String?
+
+    private let from: ConstraintItem
+    private let to: ConstraintItem
+    private let relation: ConstraintRelation
+    private let multiplier: ConstraintMultiplierTarget
+    private var constant: ConstraintConstantTarget {
+        didSet {
+            self.updateConstantAndPriorityIfNeeded()
+        }
+    }
+    private var priority: ConstraintPriorityTarget {
+        didSet {
+          self.updateConstantAndPriorityIfNeeded()
+        }
+    }
+    public var layoutConstraints: [LayoutConstraint]
+    
+    public var isActive: Bool {
+        set {
+            if newValue {
+                activate()
+            }
+            else {
+                deactivate()
+            }
+        }
+        
+        get {
+            for layoutConstraint in self.layoutConstraints {
+                if layoutConstraint.isActive {
+                    return true
+                }
+            }
+            return false
+        }
+    }
+    
+    // MARK: Initialization
+
+    internal init(from: ConstraintItem,
+                  to: ConstraintItem,
+                  relation: ConstraintRelation,
+                  sourceLocation: (String, UInt),
+                  label: String?,
+                  multiplier: ConstraintMultiplierTarget,
+                  constant: ConstraintConstantTarget,
+                  priority: ConstraintPriorityTarget) {
+        self.from = from
+        self.to = to
+        self.relation = relation
+        self.sourceLocation = sourceLocation
+        self.label = label
+        self.multiplier = multiplier
+        self.constant = constant
+        self.priority = priority
+        self.layoutConstraints = []
+
+        // get attributes
+        let layoutFromAttributes = self.from.attributes.layoutAttributes
+        let layoutToAttributes = self.to.attributes.layoutAttributes
+
+        // get layout from
+        let layoutFrom = self.from.layoutConstraintItem!
+
+        // get relation
+        let layoutRelation = self.relation.layoutRelation
+
+        for layoutFromAttribute in layoutFromAttributes {
+            // get layout to attribute
+            let layoutToAttribute: LayoutAttribute
+            #if os(iOS) || os(tvOS)
+                if layoutToAttributes.count > 0 {
+                    if self.from.attributes == .edges && self.to.attributes == .margins {
+                        switch layoutFromAttribute {
+                        case .left:
+                            layoutToAttribute = .leftMargin
+                        case .right:
+                            layoutToAttribute = .rightMargin
+                        case .top:
+                            layoutToAttribute = .topMargin
+                        case .bottom:
+                            layoutToAttribute = .bottomMargin
+                        default:
+                            fatalError()
+                        }
+                    } else if self.from.attributes == .margins && self.to.attributes == .edges {
+                        switch layoutFromAttribute {
+                        case .leftMargin:
+                            layoutToAttribute = .left
+                        case .rightMargin:
+                            layoutToAttribute = .right
+                        case .topMargin:
+                            layoutToAttribute = .top
+                        case .bottomMargin:
+                            layoutToAttribute = .bottom
+                        default:
+                            fatalError()
+                        }
+                    } else if self.from.attributes == .directionalEdges && self.to.attributes == .directionalMargins {
+                      switch layoutFromAttribute {
+                      case .leading:
+                        layoutToAttribute = .leadingMargin
+                      case .trailing:
+                        layoutToAttribute = .trailingMargin
+                      case .top:
+                        layoutToAttribute = .topMargin
+                      case .bottom:
+                        layoutToAttribute = .bottomMargin
+                      default:
+                        fatalError()
+                      }
+                    } else if self.from.attributes == .directionalMargins && self.to.attributes == .directionalEdges {
+                      switch layoutFromAttribute {
+                      case .leadingMargin:
+                        layoutToAttribute = .leading
+                      case .trailingMargin:
+                        layoutToAttribute = .trailing
+                      case .topMargin:
+                        layoutToAttribute = .top
+                      case .bottomMargin:
+                        layoutToAttribute = .bottom
+                      default:
+                        fatalError()
+                      }
+                    } else if self.from.attributes == self.to.attributes {
+                        layoutToAttribute = layoutFromAttribute
+                    } else {
+                        layoutToAttribute = layoutToAttributes[0]
+                    }
+                } else {
+                    if self.to.target == nil && (layoutFromAttribute == .centerX || layoutFromAttribute == .centerY) {
+                        layoutToAttribute = layoutFromAttribute == .centerX ? .left : .top
+                    } else {
+                        layoutToAttribute = layoutFromAttribute
+                    }
+                }
+            #else
+                if self.from.attributes == self.to.attributes {
+                    layoutToAttribute = layoutFromAttribute
+                } else if layoutToAttributes.count > 0 {
+                    layoutToAttribute = layoutToAttributes[0]
+                } else {
+                    layoutToAttribute = layoutFromAttribute
+                }
+            #endif
+
+            // get layout constant
+            let layoutConstant: CGFloat = self.constant.constraintConstantTargetValueFor(layoutAttribute: layoutToAttribute)
+
+            // get layout to
+            var layoutTo: AnyObject? = self.to.target
+
+            // use superview if possible
+            if layoutTo == nil && layoutToAttribute != .width && layoutToAttribute != .height {
+                layoutTo = layoutFrom.superview
+            }
+
+            // create layout constraint
+            let layoutConstraint = LayoutConstraint(
+                item: layoutFrom,
+                attribute: layoutFromAttribute,
+                relatedBy: layoutRelation,
+                toItem: layoutTo,
+                attribute: layoutToAttribute,
+                multiplier: self.multiplier.constraintMultiplierTargetValue,
+                constant: layoutConstant
+            )
+
+            // set label
+            layoutConstraint.label = self.label
+
+            // set priority
+            layoutConstraint.priority = LayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
+
+            // set constraint
+            layoutConstraint.constraint = self
+
+            // append
+            self.layoutConstraints.append(layoutConstraint)
+        }
+    }
+
+    // MARK: Public
+
+    @available(*, deprecated, message:"Use activate().")
+    public func install() {
+        self.activate()
+    }
+
+    @available(*, deprecated, message:"Use deactivate().")
+    public func uninstall() {
+        self.deactivate()
+    }
+
+    public func activate() {
+        self.activateIfNeeded()
+    }
+
+    public func deactivate() {
+        self.deactivateIfNeeded()
+    }
+
+    @discardableResult
+    public func update(offset: ConstraintOffsetTarget) -> Constraint {
+        self.constant = offset.constraintOffsetTargetValue
+        return self
+    }
+
+    @discardableResult
+    public func update(inset: ConstraintInsetTarget) -> Constraint {
+        self.constant = inset.constraintInsetTargetValue
+        return self
+    }
+
+    #if os(iOS) || os(tvOS)
+    @discardableResult
+    @available(iOS 11.0, tvOS 11.0, *)
+    public func update(inset: ConstraintDirectionalInsetTarget) -> Constraint {
+      self.constant = inset.constraintDirectionalInsetTargetValue
+      return self
+    }
+    #endif
+
+    @discardableResult
+    public func update(priority: ConstraintPriorityTarget) -> Constraint {
+        self.priority = priority.constraintPriorityTargetValue
+        return self
+    }
+
+    @discardableResult
+    public func update(priority: ConstraintPriority) -> Constraint {
+        self.priority = priority.value
+        return self
+    }
+
+    @available(*, deprecated, message:"Use update(offset: ConstraintOffsetTarget) instead.")
+    public func updateOffset(amount: ConstraintOffsetTarget) -> Void { self.update(offset: amount) }
+
+    @available(*, deprecated, message:"Use update(inset: ConstraintInsetTarget) instead.")
+    public func updateInsets(amount: ConstraintInsetTarget) -> Void { self.update(inset: amount) }
+
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    public func updatePriority(amount: ConstraintPriorityTarget) -> Void { self.update(priority: amount) }
+
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    public func updatePriorityRequired() -> Void {}
+
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    public func updatePriorityHigh() -> Void { fatalError("Must be implemented by Concrete subclass.") }
+
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
+
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
+
+    // MARK: Internal
+
+    internal func updateConstantAndPriorityIfNeeded() {
+        for layoutConstraint in self.layoutConstraints {
+            let attribute = (layoutConstraint.secondAttribute == .notAnAttribute) ? layoutConstraint.firstAttribute : layoutConstraint.secondAttribute
+            layoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: attribute)
+
+            let requiredPriority = ConstraintPriority.required.value
+            if (layoutConstraint.priority.rawValue < requiredPriority), (self.priority.constraintPriorityTargetValue != requiredPriority) {
+                layoutConstraint.priority = LayoutPriority(rawValue: self.priority.constraintPriorityTargetValue)
+            }
+        }
+    }
+
+    internal func activateIfNeeded(updatingExisting: Bool = false) {
+        guard let item = self.from.layoutConstraintItem else {
+            print("WARNING: SnapKit failed to get from item from constraint. Activate will be a no-op.")
+            return
+        }
+        let layoutConstraints = self.layoutConstraints
+
+        if updatingExisting {
+            var existingLayoutConstraints: [LayoutConstraint] = []
+            for constraint in item.constraints {
+                existingLayoutConstraints += constraint.layoutConstraints
+            }
+
+            for layoutConstraint in layoutConstraints {
+                let existingLayoutConstraint = existingLayoutConstraints.first { $0 == layoutConstraint }
+                guard let updateLayoutConstraint = existingLayoutConstraint else {
+                    fatalError("Updated constraint could not find existing matching constraint to update: \(layoutConstraint)")
+                }
+
+                let updateLayoutAttribute = (updateLayoutConstraint.secondAttribute == .notAnAttribute) ? updateLayoutConstraint.firstAttribute : updateLayoutConstraint.secondAttribute
+                updateLayoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: updateLayoutAttribute)
+            }
+        } else {
+            NSLayoutConstraint.activate(layoutConstraints)
+            item.add(constraints: [self])
+        }
+    }
+
+    internal func deactivateIfNeeded() {
+        guard let item = self.from.layoutConstraintItem else {
+            print("WARNING: SnapKit failed to get from item from constraint. Deactivate will be a no-op.")
+            return
+        }
+        let layoutConstraints = self.layoutConstraints
+        NSLayoutConstraint.deactivate(layoutConstraints)
+        item.remove(constraints: [self])
+    }
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+internal struct ConstraintAttributes : OptionSet, ExpressibleByIntegerLiteral {
+    
+    typealias IntegerLiteralType = UInt
+    
+    internal init(rawValue: UInt) {
+        self.rawValue = rawValue
+    }
+    internal init(_ rawValue: UInt) {
+        self.init(rawValue: rawValue)
+    }
+    internal init(nilLiteral: ()) {
+        self.rawValue = 0
+    }
+    internal init(integerLiteral rawValue: IntegerLiteralType) {
+        self.init(rawValue: rawValue)
+    }
+    
+    internal private(set) var rawValue: UInt
+    internal static var allZeros: ConstraintAttributes { return 0 }
+    internal static func convertFromNilLiteral() -> ConstraintAttributes { return 0 }
+    internal var boolValue: Bool { return self.rawValue != 0 }
+    
+    internal func toRaw() -> UInt { return self.rawValue }
+    internal static func fromRaw(_ raw: UInt) -> ConstraintAttributes? { return self.init(raw) }
+    internal static func fromMask(_ raw: UInt) -> ConstraintAttributes { return self.init(raw) }
+    
+    // normal
+    
+    internal static var none: ConstraintAttributes { return 0 }
+    internal static var left: ConstraintAttributes { return 1 }
+    internal static var top: ConstraintAttributes {  return 2 }
+    internal static var right: ConstraintAttributes { return 4 }
+    internal static var bottom: ConstraintAttributes { return 8 }
+    internal static var leading: ConstraintAttributes { return 16 }
+    internal static var trailing: ConstraintAttributes { return 32 }
+    internal static var width: ConstraintAttributes { return 64 }
+    internal static var height: ConstraintAttributes { return 128 }
+    internal static var centerX: ConstraintAttributes { return 256 }
+    internal static var centerY: ConstraintAttributes { return 512 }
+    internal static var lastBaseline: ConstraintAttributes { return 1024 }
+    
+    @available(iOS 8.0, OSX 10.11, *)
+    internal static var firstBaseline: ConstraintAttributes { return 2048 }
+    
+    @available(iOS 8.0, *)
+    internal static var leftMargin: ConstraintAttributes { return 4096 }
+    
+    @available(iOS 8.0, *)
+    internal static var rightMargin: ConstraintAttributes { return 8192 }
+    
+    @available(iOS 8.0, *)
+    internal static var topMargin: ConstraintAttributes { return 16384 }
+    
+    @available(iOS 8.0, *)
+    internal static var bottomMargin: ConstraintAttributes { return 32768 }
+    
+    @available(iOS 8.0, *)
+    internal static var leadingMargin: ConstraintAttributes { return 65536 }
+    
+    @available(iOS 8.0, *)
+    internal static var trailingMargin: ConstraintAttributes { return 131072 }
+    
+    @available(iOS 8.0, *)
+    internal static var centerXWithinMargins: ConstraintAttributes { return 262144 }
+    
+    @available(iOS 8.0, *)
+    internal static var centerYWithinMargins: ConstraintAttributes { return 524288 }
+    
+    // aggregates
+    
+    internal static var edges: ConstraintAttributes { return 15 }
+    internal static var directionalEdges: ConstraintAttributes { return 58 }
+    internal static var size: ConstraintAttributes { return 192 }
+    internal static var center: ConstraintAttributes { return 768 }
+    
+    @available(iOS 8.0, *)
+    internal static var margins: ConstraintAttributes { return 61440 }
+    
+    @available(iOS 8.0, *)
+    internal static var directionalMargins: ConstraintAttributes { return 245760 }
+
+    @available(iOS 8.0, *)
+    internal static var centerWithinMargins: ConstraintAttributes { return 786432 }
+    
+    internal var layoutAttributes:[LayoutAttribute] {
+        var attrs = [LayoutAttribute]()
+        if (self.contains(ConstraintAttributes.left)) {
+            attrs.append(.left)
+        }
+        if (self.contains(ConstraintAttributes.top)) {
+            attrs.append(.top)
+        }
+        if (self.contains(ConstraintAttributes.right)) {
+            attrs.append(.right)
+        }
+        if (self.contains(ConstraintAttributes.bottom)) {
+            attrs.append(.bottom)
+        }
+        if (self.contains(ConstraintAttributes.leading)) {
+            attrs.append(.leading)
+        }
+        if (self.contains(ConstraintAttributes.trailing)) {
+            attrs.append(.trailing)
+        }
+        if (self.contains(ConstraintAttributes.width)) {
+            attrs.append(.width)
+        }
+        if (self.contains(ConstraintAttributes.height)) {
+            attrs.append(.height)
+        }
+        if (self.contains(ConstraintAttributes.centerX)) {
+            attrs.append(.centerX)
+        }
+        if (self.contains(ConstraintAttributes.centerY)) {
+            attrs.append(.centerY)
+        }
+        if (self.contains(ConstraintAttributes.lastBaseline)) {
+            attrs.append(.lastBaseline)
+        }
+        
+        #if os(iOS) || os(tvOS)
+            if (self.contains(ConstraintAttributes.firstBaseline)) {
+                attrs.append(.firstBaseline)
+            }
+            if (self.contains(ConstraintAttributes.leftMargin)) {
+                attrs.append(.leftMargin)
+            }
+            if (self.contains(ConstraintAttributes.rightMargin)) {
+                attrs.append(.rightMargin)
+            }
+            if (self.contains(ConstraintAttributes.topMargin)) {
+                attrs.append(.topMargin)
+            }
+            if (self.contains(ConstraintAttributes.bottomMargin)) {
+                attrs.append(.bottomMargin)
+            }
+            if (self.contains(ConstraintAttributes.leadingMargin)) {
+                attrs.append(.leadingMargin)
+            }
+            if (self.contains(ConstraintAttributes.trailingMargin)) {
+                attrs.append(.trailingMargin)
+            }
+            if (self.contains(ConstraintAttributes.centerXWithinMargins)) {
+                attrs.append(.centerXWithinMargins)
+            }
+            if (self.contains(ConstraintAttributes.centerYWithinMargins)) {
+                attrs.append(.centerYWithinMargins)
+            }
+        #endif
+        
+        return attrs
+    }
+}
+
+internal func + (left: ConstraintAttributes, right: ConstraintAttributes) -> ConstraintAttributes {
+    return left.union(right)
+}
+
+internal func +=(left: inout ConstraintAttributes, right: ConstraintAttributes) {
+    left.formUnion(right)
+}
+
+internal func -=(left: inout ConstraintAttributes, right: ConstraintAttributes) {
+    left.subtract(right)
+}
+
+internal func ==(left: ConstraintAttributes, right: ConstraintAttributes) -> Bool {
+    return left.rawValue == right.rawValue
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+    public typealias ConstraintInterfaceLayoutDirection = UIUserInterfaceLayoutDirection
+#else
+    import AppKit
+    public typealias ConstraintInterfaceLayoutDirection = NSUserInterfaceLayoutDirection
+#endif
+
+
+public struct ConstraintConfig {
+    
+    public static var interfaceLayoutDirection: ConstraintInterfaceLayoutDirection = .leftToRight
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public protocol ConstraintConstantTarget {
+}
+
+extension CGPoint: ConstraintConstantTarget {
+}
+
+extension CGSize: ConstraintConstantTarget {    
+}
+
+extension ConstraintInsets: ConstraintConstantTarget {
+}
+
+#if os(iOS) || os(tvOS)
+@available(iOS 11.0, tvOS 11.0, *)
+extension ConstraintDirectionalInsets: ConstraintConstantTarget {
+}
+#endif
+
+extension ConstraintConstantTarget {
+    
+    internal func constraintConstantTargetValueFor(layoutAttribute: LayoutAttribute) -> CGFloat {
+        if let value = self as? CGFloat {
+            return value
+        }
+        
+        if let value = self as? Float {
+            return CGFloat(value)
+        }
+        
+        if let value = self as? Double {
+            return CGFloat(value)
+        }
+        
+        if let value = self as? Int {
+            return CGFloat(value)
+        }
+        
+        if let value = self as? UInt {
+            return CGFloat(value)
+        }
+        
+        if let value = self as? CGSize {
+            if layoutAttribute == .width {
+                return value.width
+            } else if layoutAttribute == .height {
+                return value.height
+            } else {
+                return 0.0
+            }
+        }
+        
+        if let value = self as? CGPoint {
+            #if os(iOS) || os(tvOS)
+                switch layoutAttribute {
+                case .left, .right, .leading, .trailing, .centerX, .leftMargin, .rightMargin, .leadingMargin, .trailingMargin, .centerXWithinMargins:
+                    return value.x
+                case .top, .bottom, .centerY, .topMargin, .bottomMargin, .centerYWithinMargins, .lastBaseline, .firstBaseline:
+                    return value.y
+                case .width, .height, .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
+            #else
+                switch layoutAttribute {
+                case .left, .right, .leading, .trailing, .centerX:
+                    return value.x
+                case .top, .bottom, .centerY, .lastBaseline, .firstBaseline:
+                    return value.y
+                case .width, .height, .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
+            #endif
+        }
+        
+        if let value = self as? ConstraintInsets {
+            #if os(iOS) || os(tvOS)
+                switch layoutAttribute {
+                case .left, .leftMargin:
+                    return value.left
+                case .top, .topMargin, .firstBaseline:
+                    return value.top
+                case .right, .rightMargin:
+                    return -value.right
+                case .bottom, .bottomMargin, .lastBaseline:
+                    return -value.bottom
+                case .leading, .leadingMargin:
+                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
+                case .trailing, .trailingMargin:
+                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
+                case .centerX, .centerXWithinMargins:
+                    return (value.left - value.right) / 2
+                case .centerY, .centerYWithinMargins:
+                    return (value.top - value.bottom) / 2
+                case .width:
+                    return -(value.left + value.right)
+                case .height:
+                    return -(value.top + value.bottom)
+                case .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
+            #else
+                switch layoutAttribute {
+                case .left:
+                    return value.left
+                case .top, .firstBaseline:
+                    return value.top
+                case .right:
+                    return -value.right
+                case .bottom, .lastBaseline:
+                    return -value.bottom
+                case .leading:
+                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
+                case .trailing:
+                    return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
+                case .centerX:
+                    return (value.left - value.right) / 2
+                case .centerY:
+                    return (value.top - value.bottom) / 2
+                case .width:
+                    return -(value.left + value.right)
+                case .height:
+                    return -(value.top + value.bottom)
+                case .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
+            #endif
+        }
+        
+        #if os(iOS) || os(tvOS)
+            if #available(iOS 11.0, tvOS 11.0, *), let value = self as? ConstraintDirectionalInsets {
+                switch layoutAttribute {
+                case .left, .leftMargin:
+                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.leading : value.trailing
+                case .top, .topMargin, .firstBaseline:
+                    return value.top
+                case .right, .rightMargin:
+                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.trailing : -value.leading
+                case .bottom, .bottomMargin, .lastBaseline:
+                    return -value.bottom
+                case .leading, .leadingMargin:
+                    return value.leading
+                case .trailing, .trailingMargin:
+                    return -value.trailing
+                case .centerX, .centerXWithinMargins:
+                    return (value.leading - value.trailing) / 2
+                case .centerY, .centerYWithinMargins:
+                    return (value.top - value.bottom) / 2
+                case .width:
+                    return -(value.leading + value.trailing)
+                case .height:
+                    return -(value.top + value.bottom)
+                case .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #else
+                default:
+                    return 0.0
+                #endif
+                }
+            }
+        #endif
+
+        return 0.0
+    }
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public protocol ConstraintDSL {
+    
+    var target: AnyObject? { get }
+    
+    func setLabel(_ value: String?)
+    func label() -> String?
+    
+}
+extension ConstraintDSL {
+    
+    public func setLabel(_ value: String?) {
+        objc_setAssociatedObject(self.target as Any, &labelKey, value, .OBJC_ASSOCIATION_COPY_NONATOMIC)
+    }
+    public func label() -> String? {
+        return objc_getAssociatedObject(self.target as Any, &labelKey) as? String
+    }
+    
+}
+private var labelKey: UInt8 = 0
+
+
+public protocol ConstraintBasicAttributesDSL : ConstraintDSL {
+}
+extension ConstraintBasicAttributesDSL {
+    
+    // MARK: Basics
+    
+    public var left: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.left)
+    }
+    
+    public var top: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.top)
+    }
+    
+    public var right: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.right)
+    }
+    
+    public var bottom: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.bottom)
+    }
+    
+    public var leading: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.leading)
+    }
+    
+    public var trailing: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.trailing)
+    }
+    
+    public var width: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.width)
+    }
+    
+    public var height: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.height)
+    }
+    
+    public var centerX: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerX)
+    }
+    
+    public var centerY: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerY)
+    }
+    
+    public var edges: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.edges)
+    }
+    
+    public var directionalEdges: ConstraintItem {
+      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalEdges)
+    }
+
+    public var size: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.size)
+    }
+    
+    public var center: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.center)
+    }
+    
+}
+
+public protocol ConstraintAttributesDSL : ConstraintBasicAttributesDSL {
+}
+extension ConstraintAttributesDSL {
+    
+    // MARK: Baselines
+    
+    @available(*, deprecated, message:"Use .lastBaseline instead")
+    public var baseline: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.lastBaseline)
+    }
+    
+    @available(iOS 8.0, OSX 10.11, *)
+    public var lastBaseline: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.lastBaseline)
+    }
+    
+    @available(iOS 8.0, OSX 10.11, *)
+    public var firstBaseline: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.firstBaseline)
+    }
+    
+    // MARK: Margins
+    
+    @available(iOS 8.0, *)
+    public var leftMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.leftMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var topMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.topMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var rightMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.rightMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var bottomMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.bottomMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var leadingMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.leadingMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var trailingMargin: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.trailingMargin)
+    }
+    
+    @available(iOS 8.0, *)
+    public var centerXWithinMargins: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerXWithinMargins)
+    }
+    
+    @available(iOS 8.0, *)
+    public var centerYWithinMargins: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerYWithinMargins)
+    }
+    
+    @available(iOS 8.0, *)
+    public var margins: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.margins)
+    }
+    
+    @available(iOS 8.0, *)
+    public var directionalMargins: ConstraintItem {
+      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalMargins)
+    }
+
+    @available(iOS 8.0, *)
+    public var centerWithinMargins: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerWithinMargins)
+    }
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public class ConstraintDescription {
+    
+    internal let item: LayoutConstraintItem
+    internal var attributes: ConstraintAttributes
+    internal var relation: ConstraintRelation? = nil
+    internal var sourceLocation: (String, UInt)? = nil
+    internal var label: String? = nil
+    internal var related: ConstraintItem? = nil
+    internal var multiplier: ConstraintMultiplierTarget = 1.0
+    internal var constant: ConstraintConstantTarget = 0.0
+    internal var priority: ConstraintPriorityTarget = 1000.0
+    internal lazy var constraint: Constraint? = {
+        guard let relation = self.relation,
+              let related = self.related,
+              let sourceLocation = self.sourceLocation else {
+            return nil
+        }
+        let from = ConstraintItem(target: self.item, attributes: self.attributes)
+        
+        return Constraint(
+            from: from,
+            to: related,
+            relation: relation,
+            sourceLocation: sourceLocation,
+            label: self.label,
+            multiplier: self.multiplier,
+            constant: self.constant,
+            priority: self.priority
+        )
+    }()
+    
+    // MARK: Initialization
+    
+    internal init(item: LayoutConstraintItem, attributes: ConstraintAttributes) {
+        self.item = item
+        self.attributes = attributes
+    }
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+import UIKit
+#else
+import AppKit
+#endif
+
+#if os(iOS) || os(tvOS)
+public protocol ConstraintDirectionalInsetTarget: ConstraintConstantTarget {
+}
+
+@available(iOS 11.0, tvOS 11.0, *)
+extension ConstraintDirectionalInsets: ConstraintDirectionalInsetTarget {
+}
+
+extension ConstraintDirectionalInsetTarget {
+
+  @available(iOS 11.0, tvOS 11.0, *)
+  internal var constraintDirectionalInsetTargetValue: ConstraintDirectionalInsets {
+    if let amount = self as? ConstraintDirectionalInsets {
+      return amount
+    } else {
+      return ConstraintDirectionalInsets(top: 0, leading: 0, bottom: 0, trailing: 0)
+    }
+  }
+}
+#endif

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+#if os(iOS) || os(tvOS)
+    @available(iOS 11.0, tvOS 11.0, *)
+    public typealias ConstraintDirectionalInsets = NSDirectionalEdgeInsets
+#endif

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public protocol ConstraintInsetTarget: ConstraintConstantTarget {
+}
+
+extension Int: ConstraintInsetTarget {
+}
+
+extension UInt: ConstraintInsetTarget {
+}
+
+extension Float: ConstraintInsetTarget {
+}
+
+extension Double: ConstraintInsetTarget {
+}
+
+extension CGFloat: ConstraintInsetTarget {
+}
+
+extension ConstraintInsets: ConstraintInsetTarget {
+}
+
+extension ConstraintInsetTarget {
+
+    internal var constraintInsetTargetValue: ConstraintInsets {
+        if let amount = self as? ConstraintInsets {
+            return amount
+        } else if let amount = self as? Float {
+            return ConstraintInsets(top: CGFloat(amount), left: CGFloat(amount), bottom: CGFloat(amount), right: CGFloat(amount))
+        } else if let amount = self as? Double {
+            return ConstraintInsets(top: CGFloat(amount), left: CGFloat(amount), bottom: CGFloat(amount), right: CGFloat(amount))
+        } else if let amount = self as? CGFloat {
+            return ConstraintInsets(top: amount, left: amount, bottom: amount, right: amount)
+        } else if let amount = self as? Int {
+            return ConstraintInsets(top: CGFloat(amount), left: CGFloat(amount), bottom: CGFloat(amount), right: CGFloat(amount))
+        } else if let amount = self as? UInt {
+            return ConstraintInsets(top: CGFloat(amount), left: CGFloat(amount), bottom: CGFloat(amount), right: CGFloat(amount))
+        } else {
+            return ConstraintInsets(top: 0, left: 0, bottom: 0, right: 0)
+        }
+    }
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+#if os(iOS) || os(tvOS)
+    public typealias ConstraintInsets = UIEdgeInsets
+#else
+    public typealias ConstraintInsets = NSEdgeInsets
+#endif

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public final class ConstraintItem {
+    
+    internal weak var target: AnyObject?
+    internal let attributes: ConstraintAttributes
+    
+    internal init(target: AnyObject?, attributes: ConstraintAttributes) {
+        self.target = target
+        self.attributes = attributes
+    }
+    
+    internal var layoutConstraintItem: LayoutConstraintItem? {
+        return self.target as? LayoutConstraintItem
+    }
+    
+}
+
+public func ==(lhs: ConstraintItem, rhs: ConstraintItem) -> Bool {
+    // pointer equality
+    guard lhs !== rhs else {
+        return true
+    }
+    
+    // must both have valid targets and identical attributes
+    guard let target1 = lhs.target,
+          let target2 = rhs.target,
+          target1 === target2 && lhs.attributes == rhs.attributes else {
+            return false
+    }
+    
+    return true
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#endif
+    
+    
+@available(iOS 9.0, OSX 10.11, *)
+public extension ConstraintLayoutGuide {
+    
+    var snp: ConstraintLayoutGuideDSL {
+        return ConstraintLayoutGuideDSL(guide: self)
+    }
+    
+}

+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+#if os(iOS) || os(tvOS)
+    @available(iOS 9.0, *)
+    public typealias ConstraintLayoutGuide = UILayoutGuide
+#else
+    @available(OSX 10.11, *)
+    public typealias ConstraintLayoutGuide = NSLayoutGuide
+#endif