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