IOS动画效果

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.view.addSubview(img)
}

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
//每个效果都需要开始、配置、提交 三步
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationTransition(UIViewAnimationTransition.FlipFromRight, forView: img, cache: true)        //cache是否缓存
UIView.setAnimationDuration(1.0)//时间
UIView.commitAnimations()   //提交
}