Switcher with animation

Switcher.swift

@@ -0,0 +1,115 @@
+//
+//  Switcher.swift
+//  SwitcherExample
+//
+//  Created by Khoi Nguyen Nguyen on 11/2/15.
+//  Copyright © 2015 Khoi Nguyen Nguyen. All rights reserved.
+//
+
+import UIKit
+
+protocol SwitcherChangeValueDelegate {
+    func switcherDidChangeValue(value:Bool)
+}
+
+class Switcher: UIView {
+
+    @IBOutlet weak var button: UIButton!
+    @IBOutlet weak var leftSpace: NSLayoutConstraint!
+
+    var delegate: SwitcherChangeValueDelegate?
+
+    private var status:Bool = false
+
+    private var originPosition:CGFloat = 0.0
+    private var finalPosition:CGFloat = 0.0
+
+    override func awakeFromNib() {
+        setUpUI()
+    }
+
+    func setUpUI() {
+        button.setImage(UIImage(named: "Delete"), forState: UIControlState.Normal)
+    }
+
+    override func layoutSubviews() {
+
+    }
+
+    override func drawRect(rect: CGRect) {
+        super.drawRect(rect)
+        self.layer.cornerRadius = self.frame.height / 2
+        self.clipsToBounds = true
+
+        button.layer.cornerRadius = button.frame.height / 2
+        originPosition = (self.frame.height - button.frame.height) / 2;
+        finalPosition = self.frame.width - originPosition - self.button.frame.width;
+        leftSpace.constant = originPosition
+    }
+
+    @IBAction func switcherButtonDidTouch(sender: AnyObject) {
+        if status {
+
+            animationSwitcherButton(status)
+        } else {
+
+            animationSwitcherButton(status)
+        }
+        status = !status;
+        delegate?.switcherDidChangeValue(status)
+    }
+
+    func animationSwitcherButton(status:Bool) {
+        if status {
+
+            // Clear Shadow
+            self.button.layer.shadowOffset = CGSizeZero
+            self.button.layer.shadowOpacity = 0
+            self.button.layer.shadowRadius = self.button.frame.height / 2
+            self.button.layer.cornerRadius = self.button.frame.height / 2
+            self.button.layer.shadowPath = nil
+
+            // Rotate animation
+            let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
+            rotateAnimation.fromValue = 0.0
+            rotateAnimation.toValue = CGFloat(M_PI)
+            rotateAnimation.duration = 0.5
+            rotateAnimation.cumulative = false;
+            self.button.layer.addAnimation(rotateAnimation, forKey: "rotate")
+
+            UIView.animateWithDuration(0.5, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: { () -> Void in
+                self.button.setImage(UIImage(named: "Delete"), forState: UIControlState.Normal)
+                self.leftSpace.constant = self.originPosition
+                self.layoutIfNeeded()
+                self.button.backgroundColor = UIColor(red: 243/255.0, green: 229/255.0, blue: 211/255.0, alpha: 1)
+                }, completion: { (finish:Bool) -> Void in
+
+            })
+
+        } else {
+
+            // Rotate animation
+            let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
+            rotateAnimation.fromValue = CGFloat(M_PI)
+            rotateAnimation.toValue = 0.0
+            rotateAnimation.duration = 0.5
+            rotateAnimation.cumulative = false;
+            self.button.layer.addAnimation(rotateAnimation, forKey: "rotate")
+
+            // Translation animation
+            UIView.animateWithDuration(0.5, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: { () -> Void in
+                self.button.setImage(UIImage(named: "Checkmark"), forState: UIControlState.Normal)
+                self.leftSpace.constant = self.finalPosition
+                self.layoutIfNeeded()
+                self.button.backgroundColor = UIColor(red: 126/255.0, green: 134/255.0, blue: 249/255.0, alpha: 1)
+                }, completion: { (finish:Bool) -> Void in
+                    self.button.layer.shadowOffset = CGSizeMake(0, 0.2)
+                    self.button.layer.shadowOpacity = 0.3
+                    self.button.layer.shadowRadius = 5.0
+                    self.button.layer.cornerRadius = self.button.frame.height / 2
+                    self.button.layer.shadowPath = UIBezierPath(roundedRect: self.button.layer.bounds, cornerRadius: self.button.frame.height / 2).CGPath
+            })
+
+        }
+    }
+}