视图的大小应该是随时可控的。今天我们就来实现对一个View的缩放动画。该动画的实现与位移动画，透明度动画稍有不同。

详细实现例如以下：

import UIKitclass ScaleViewController: UIViewController {            @IBOutlet weak var greenSquare: UIView!        override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        override func viewDidAppear(animated: Bool) {        super.viewDidAppear(animated)                func anim(){                    self.greenSquare.transform = CGAffineTransformMakeScale(0.5, 0.5)//缩小为原来的0.5倍。        }                        UIView.animateWithDuration(1, animations: anim)                            }}

（3）执行程序。发现View能够变为原来X。Y轴上的0.5倍。

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