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）

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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

2

//表示监听滑动的方向为向上 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

18

19

20

21

22

23

24

25

26

27

swipeUp = swipeUp.direction = .view.addGestureRecognizer(swipeUp) swipeDown = )) swipeDown.direction = Down .view.addGestureRecognizer(swipeDown) } ){ if recognizer.direction == Up { "向上滑动" ) } else Down { "向下滑动" ) } .view) //这个点是滑动的起点 (point.x) (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

27

28

29

//单击监听 tapSingle= UITapGestureRecognizer ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,action: "tapSingleDid" ) tapSingle.numberOfTapsrequired=1 tapSingle.numberOftouchesrequired=1 //双击监听 tapDouble= "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); .view.addGestureRecognizer(tapSingle) .view.addGestureRecognizer(tapDouble) } tapSingleDid(){ "单击了" ) } tapDoubleDid(sender: ){ sender.view == .view{ "双击了" ) } } }

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

17

//设置监听方法为pinchDid方法 pinch= UIPinchGestureRecognizer "pinchDid:" .view.addGestureRecognizer(pinch) } pinchDid(recognizer: { //在监听方法中可以实时获得捏合的比例 (recognizer.scale); } }

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

14

rotation= UIRotationGestureRecognizer "rotationDid:" ) .view.addGestureRecognizer(rotation) } rotationDid(recognizer: ){ //旋转的弧度转换为角度 (recognizer.rotation*(180/ CGFloat ( M_PI ))) }

5，UIPanGestureRecognizer：拖动手势

23

rect: UIView ! viewDidLoad() { .viewDidLoad() rect= (frame: CGRectMake (0,100,100)) rect.center= .view.center rect.backgroundColor= UIColor .redColor() .view.addSubview(rect) pan = UIPanGestureRecognizer "panDid:" ) pan.maximumNumberOftouches=1 rect.addGestureRecognizer(pan) panDid(recognizer: ){ .view) //设置矩形的位置 rect.center=point }

6，UILongPressGestureRecognizer：长按