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
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//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