[ios] add UndoToast class

Signed-off-by: Kiryl Kaveryn <kirylkaveryn@gmail.com>

iphone/Maps/Classes/CustomAlert/Toast/Toast.swift

@@ -38,6 +38,7 @@ extension Toast {
   }
 
   @objc func show() {
+    Self.hideAll()
     show(in: UIApplication.shared.keyWindow, alignment: .bottom, duration: Toast.duration)
   }
 
@@ -100,6 +101,11 @@ extension Toast {
   @objc static func undoToast(withText text: String, undoAction: @escaping () -> Void) -> Toast {
     UndoToast(text, undoAction: undoAction)
   }
+
+  @objc static func undoToast(deletedObject: String, undoAction: @escaping () -> Void) -> Toast {
+    // TODO: localize text
+    undoToast(withText: "The \(deletedObject) was deleted", undoAction: undoAction)
+  }
 }
 
 private final class DefaultToast: Toast {
@@ -134,3 +140,63 @@ private final class DefaultToast: Toast {
     ])
   }
 }
+
+private final class UndoToast: Toast {
+
+  private let messageLabel = UILabel()
+  private let undoButton = UIButton()
+  private var undoAction: (() -> Void)?
+
+  fileprivate convenience init(_ text: String, undoAction: @escaping () -> Void) {
+    self.init()
+    self.undoAction = undoAction
+    setupMessageLabel(text)
+    setupUndoButton()
+    layoutViews()
+  }
+
+  private func setupMessageLabel(_ text: String) {
+    messageLabel.text = text
+    messageLabel.textAlignment = .center
+    messageLabel.numberOfLines = 0
+    messageLabel.font = .regular14()
+    messageLabel.textColor = .white
+    messageLabel.isUserInteractionEnabled = false
+  }
+
+  private func setupUndoButton() {
+    undoButton.setTitle(L("undo"), for: .normal)
+    undoButton.setTitleColor(.white, for: .normal)
+    undoButton.setTitleColor(.lightGray, for: .highlighted)
+    undoButton.titleLabel?.font = .bold17()
+    undoButton.backgroundColor = .clear
+    undoButton.addTarget(self, action: #selector(undoButtonDidTap), for: .touchUpInside)
+  }
+
+  @objc private func undoButtonDidTap() {
+    undoAction?()
+    self.hide()
+  }
+
+  private func layoutViews() {
+    contentView.addSubview(messageLabel)
+    contentView.addSubview(undoButton)
+
+    messageLabel.translatesAutoresizingMaskIntoConstraints = false
+    undoButton.translatesAutoresizingMaskIntoConstraints = false
+
+    messageLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
+    NSLayoutConstraint.activate([
+      contentView.heightAnchor.constraint(greaterThanOrEqualToConstant: 40),
+
+      messageLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 12),
+      messageLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 8),
+      messageLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -8),
+
+      undoButton.leadingAnchor.constraint(equalTo: messageLabel.trailingAnchor, constant: 20),
+      undoButton.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -25),
+      undoButton.centerYAnchor.constraint(equalTo: messageLabel.centerYAnchor),
+      undoButton.heightAnchor.constraint(equalToConstant: 30),
+    ])
+  }
+}