IOS UIPinchGestureRecognizer 捏合手势

//缩小放大图片
 1 override func viewDidLoad() {
 2 super.viewDidLoad()
 3 // Do any additional setup after loading the view,
 typically from a nib.
 4 let rect = CGRect(x：0, y：80, width：320, height：
 
 5 let imageView = UIImageView(frame：rect)
 6
 7 let image = UIImage(named：“Hand”)
 8 imageView.image = image
 9
 10 imageView.isUserInteractionEnabled = true
 11 self.view.addSubview(imageView)
 12
 13 let guesture = UIPinchGestureRecognizer(target：self,
 action：#selector(ViewController.pinchImage(：)))
 14 imageView.addGestureRecognizer(guesture)}
 15 func pinchImage( recognizer：
 UIPinchGestureRecognizer)
 16 {
 17 recognizer.view？.transform =
 (recognizer.view？.transform.scaledBy(x：recognizer.scale,
 y： recognizer.scale))！
 18 recognizer.scale = 1;
 19 }