Repo created

iphone/Maps/Classes/Components/Checkmark.swift

@@ -0,0 +1,112 @@
+class Checkmark: UIControl {
+  
+  private let imageView = UIImageView(frame: .zero)
+  
+  @IBInspectable
+  var offImage: UIImage? {
+    didSet {
+      updateImage(animated: false)
+    }
+  }
+  
+  @IBInspectable
+  var onImage: UIImage? {
+    didSet {
+      updateImage(animated: false)
+    }
+  }
+  
+  @IBInspectable
+  var offTintColor: UIColor? {
+    didSet {
+      updateTintColor()
+    }
+  }
+  
+  @IBInspectable
+  var onTintColor: UIColor? {
+    didSet {
+      updateTintColor()
+    }
+  }
+  
+  @IBInspectable
+  var isChecked: Bool = false {
+    didSet {
+      updateImage(animated: true)
+      updateTintColor()
+    }
+  }
+  
+  override var isHighlighted: Bool {
+    didSet {
+      imageView.tintColor = isHighlighted ? tintColor.blending(with: UIColor(white: 0, alpha: 0.5)) : nil
+    }
+  }
+  
+  override init(frame: CGRect) {
+    super.init(frame: frame)
+    initViews()
+  }
+  
+  required init?(coder aDecoder: NSCoder) {
+    super.init(coder: aDecoder)
+    initViews()
+  }
+  
+  private func initViews() {
+    addSubview(imageView)
+    addTarget(self, action: #selector(onTouch), for: .touchUpInside)
+  }
+  
+  override func layoutSubviews() {
+    super.layoutSubviews()
+    
+    imageView.sizeToFit()
+    
+    var left: CGFloat = 0;
+    var top: CGFloat = 0;
+    var width: CGFloat = imageView.width;
+    var height: CGFloat = imageView.height;
+    
+    switch contentHorizontalAlignment {
+    case .right: fallthrough
+    case .trailing:
+      left = floor(bounds.width - imageView.width)
+    case .center:
+      left = floor((bounds.width - width) / 2)
+    case .fill:
+      width = bounds.width
+    default:
+      left = 0
+    }
+    
+    switch contentVerticalAlignment {
+    case .top:
+      top = 0
+    case .bottom:
+      top = floor(bounds.height - height)
+    case .center:
+      top = floor((bounds.height - height) / 2)
+    case .fill:
+      height = bounds.height
+    @unknown default:
+      fatalError("Unexpected case in contentVerticalAlignment switch")
+    }
+    
+    imageView.frame = CGRect(x: left, y: top, width: width, height: height)
+  }
+  
+  @objc func onTouch() {
+    isChecked = !isChecked
+    sendActions(for: .valueChanged)
+  }
+  
+  private func updateImage(animated: Bool) {
+    self.imageView.image = self.isChecked ? self.onImage : self.offImage
+  }
+  
+  private func updateTintColor() {
+    tintColor = isChecked ? onTintColor : offTintColor
+  }
+}