IOS 动画 动态变换背景色和大小

 1 import UIKit
 2
 3 class ViewController：UIViewController {
 4
 5 override func viewDidLoad() {
 6 super.viewDidLoad()
 7 // Do any additional setup after loading the view,
 typically from a nib.
 8 let rect = CGRect(x：40, y：80, width：240, height：
 
 9 let view = UIView(frame：rect)
 10 view.backgroundColor = UIColor.red
 11 view.tag = 1
 12 self.view.addSubview(view)
 13
 14 let button = UIButton(type：UIButtonType.System)
 15 button.frame = CGRect(x：50, y：400, width：220,
 height：44)
 16 button.backgroundColor = UIColor.black
 17 button.setTitle(“Play”, for：UIControlState())
 18 button.addTarget(self, action：
selector(ViewController.playAnimation), for：
UIControlEvents.touchUpInside)
 19 self.view.addSubview(button)
 20 }
 21
 22 func playAnimation()
 23 {
 24 UIView.beginAnimations(nil, context：nil)
 25 UIView.setAnimationCurve(.easeOut)
 26 UIView.setAnimationDuration(5)
 27 UIView.setAnimationBeginsFromCurrentState(true)
 28
 29 let view = self.view.viewWithTag(1)
 30 view？.frame = CGRect(x：40, y：40, width：0,
 height：0)
 31 view？.backgroundColor = UIColor.blue
 32 view？.alpha = 0
 33
 34 UIView.setAnimationDelegate(self)
 35
 UIView.setAnimationDidStop(#selector(ViewController.animationStop))
 36 UIView.commitAnimations()
 37 }
 38
 39 func animationStop()
 40 {
 41 print(“Animaton stop.”)
 42 self.view.viewWithTag(1)？.removeFromSuperview()
 43 }
 44
 45 override func didReceiveMemoryWarning() {
 46 super.didReceiveMemoryWarning()
 47 // Dispose of any resources that can be recreated.
 48 }
 49 }
//动画类型：速度类型