Swift - 各种手势检测大全（UIGestureRecognizer及其子类）

UIGestureRecognizer有许多子类，用于监听一些常见的手势事件，这些子类主要有：

1，UISwipeGestureRecognizer：滑动（快速移动）

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class ViewController: UIViewController {           override func viewDidLoad() {         super.viewDidLoad()                   var swipe = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))         swipe.direction = UISwipeGestureRecognizerDirection.Up         self.view.addGestureRecognizer(swipe)     }           func swipe(recognizer:UISwipeGestureRecognizer){         println("swipe ok")         var point=recognizer.locationInView(self.view)         //这个点是滑动的起点         println(point.x)         println(point.y)     } }

注意1：如果UISwipeGestureRecognizer在不指定方向的时候，默认向右滑动才会触发事件。如果要指定方向，需要设置direction属性

1 2	//表示监听滑动的方向为向上 swipe.direction = UISwipeGestureRecognizerDirection.Up

注意2：有网友问如果各个方向都要响应怎么办，只要多定义几个UISwipeGestureRecognizer就可以了

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class ViewController: UIViewController {           override func viewDidLoad() {         super.viewDidLoad()                   var swipeUp = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))         swipeUp.direction = UISwipeGestureRecognizerDirection.Up         self.view.addGestureRecognizer(swipeUp)                   var swipeDown = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))         swipeDown.direction = UISwipeGestureRecognizerDirection.Down         self.view.addGestureRecognizer(swipeDown)     }           func swipe(recognizer:UISwipeGestureRecognizer){         if recognizer.direction == UISwipeGestureRecognizerDirection.Up{             println("向上滑动")         }else if recognizer.direction == UISwipeGestureRecognizerDirection.Down{             println("向下滑动")         }                   var point=recognizer.locationInView(self.view)         //这个点是滑动的起点         println(point.x)         println(point.y)     } }

2，UITapGestureRecognizer：轻点手势（点击）
（1）可以通过numberOfTouchesRequired属性设置触摸点数，比如设置2表示必须两个手指触摸时才会触发
（2）通过numberOfTapsRequired属性设置点击次数，单击设置为1，双击设置为2
（3）如果一个控件既监听了单击事件也监听了双击事件，默认当双击事件触发的时候也同时会触发单击事件。如果想双击时不触发单击，需要通过requireGestureRecognizerToFail进行设置

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class ViewController: UIViewController {               override func viewDidLoad() {         super.viewDidLoad()                   //单击监听         var tapSingle=UITapGestureRecognizer(target:self,action:"tapSingleDid")         tapSingle.numberOfTapsRequired=1         tapSingle.numberOfTouchesRequired=1         //双击监听         var tapDouble=UITapGestureRecognizer(target:self,action:"tapDoubleDid:")         tapDouble.numberOfTapsRequired=2         tapDouble.numberOfTouchesRequired=1         //声明点击事件需要双击事件检测失败后才会执行         tapSingle.requireGestureRecognizerToFail(tapDouble);         self.view.addGestureRecognizer(tapSingle)         self.view.addGestureRecognizer(tapDouble)     }             func tapSingleDid(){         println("单击了")     }           func tapDoubleDid(sender:UITapGestureRecognizer){         if sender.view == self.view{                 println("双击了")         }     }    }

3，UIPinchGestureRecognizer：捏合手势（两个手指进行放大缩小）

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class ViewController: UIViewController {                  override func viewDidLoad() {         super.viewDidLoad()                   //设置监听方法为pinchDid方法         var pinch=UIPinchGestureRecognizer(target:self,action:"pinchDid:")         self.view.addGestureRecognizer(pinch)                         }     func pinchDid(recognizer:UIPinchGestureRecognizer)     {         //在监听方法中可以实时获得捏合的比例         println(recognizer.scale);     } }

4，UIRotationGestureRecognizer：旋转手势（两个手指进行旋转）

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class ViewController: UIViewController {       override func viewDidLoad() {         super.viewDidLoad()                 var rotation=UIRotationGestureRecognizer(target:self,action:"rotationDid:")         self.view.addGestureRecognizer(rotation)     }         func rotationDid(recognizer:UIRotationGestureRecognizer){         //旋转的弧度转换为角度         println(recognizer.rotation*(180/CGFloat(M_PI)))     } }

5，UIPanGestureRecognizer：拖动手势

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class ViewController: UIViewController {           var rect:UIView!           override func viewDidLoad() {         super.viewDidLoad()                   rect=UIView(frame:CGRectMake(0, 0, 100, 100))         rect.center=self.view.center         rect.backgroundColor=UIColor.redColor()         self.view.addSubview(rect)                   var pan = UIPanGestureRecognizer(target:self,action:"panDid:")         pan.maximumNumberOfTouches=1         rect.addGestureRecognizer(pan)     }              func panDid(recognizer:UISwipeGestureRecognizer){         var point=recognizer.locationInView(self.view)         //设置矩形的位置         rect.center=point     } }

6，UILongPressGestureRecognizer：长按