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）123456789101112131415161718class ViewController``: ``UIViewController {`` ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``let swipe = ``UISwipeGestureRecognizer``(target:``self``, action:``Selector``(``"swipe:"``))`` ``swipe.direction = ``UISwipeGestureRecognizerDirection``.``Up`` ``self``.view.addGestureRecognizer(swipe)`` ``}`` ``func swipe(recognizer:``UISwipeGestureRecognizer``){`` ``print``(``"swipe ok"``)`` ``var point=recognizer.locationInView(``self``.view)`` ``//这个点是滑动的起点`` ``print``(point.x)`` ``print``(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12//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123456789101112131415161718192021222324252627class ViewController``: ``UIViewController {`` ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``let swipeUp = ``UISwipeGestureRecognizer``(target:``self``, action:``Selector``(``"swipe:"``))`` ``swipeUp.direction = ``UISwipeGestureRecognizerDirection``.``Up`` ``self``.view.addGestureRecognizer(swipeUp)`` ``let swipeDown = ``UISwipeGestureRecognizer``(target:``self``, action:``Selector``(``"swipe:"``))`` ``swipeDown.direction = ``UISwipeGestureRecognizerDirection``.``Down`` ``self``.view.addGestureRecognizer(swipeDown)`` ``}`` ``func swipe(recognizer:``UISwipeGestureRecognizer``){`` ``if recognizer.direction == ``UISwipeGestureRecognizerDirection``.``Up``{`` ``print``(``"向上滑动"``)`` ``}``else if recognizer.direction == ``UISwipeGestureRecognizerDirection``.``Down``{`` ``print``(``"向下滑动"``)`` ``}`` ``let point=recognizer.locationInView(``self``.view)`` ``//这个点是滑动的起点`` ``print``(point.x)`` ``print``(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
1234567891011121314151617181920212223242526272829class ViewController``: ``UIViewController {`` ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``//单击监听`` ``let tapSingle=``UITapGestureRecognizer``(target:``self``,action:``"tapSingleDid"``)`` ``tapSingle.numberOfTapsRequired=1`` ``tapSingle.numberOfTouchesRequired=1`` ``//双击监听`` ``let 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(){`` ``print``(``"单击了"``)`` ``}`` ``func tapDoubleDid(sender:``UITapGestureRecognizer``){`` ``if sender.view == ``self``.view{`` ``print``(``"双击了"``)`` ``}`` ``} ``}
3，UIPinchGestureRecognizer：捏合手势（两个手指进行放大缩小）1234567891011121314151617class ViewController``: ``UIViewController { `` ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``//设置监听方法为pinchDid方法`` ``let 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 print(recognizer.scale);``}}4，UIRotationGestureRecognizer：旋转手势（两个手指进行旋转）1234567891011121314class`ViewController``: ``UIViewController { ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``let rotation=``UIRotationGestureRecognizer``(target:``self``,action:``"rotationDid:"``)`` ``self``.view.addGestureRecognizer(rotation)`` ``}`` ``func rotationDid(recognizer:``UIRotationGestureRecognizer``){`` ``//旋转的弧度转换为角度`` ``print``(recognizer.rotation*(180/``CGFloat``(``M_PI``)))`` ``}``}
5，UIPanGestureRecognizer：拖动手势1234567891011121314151617181920212223class 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)`` ``let pan = ``UIPanGestureRecognizer``(target:``self``,action:``"panDid:"``)`` ``pan.maximumNumberOfTouches=1`` ``rect.addGestureRecognizer(pan)`` ``}`` ``func panDid(recognizer:``UISwipeGestureRecognizer``){`` ``let point=recognizer.locationInView(``self``.view)`` ``//设置矩形的位置`` ``rect.center=point`` ``}``}
6，UILongPressGestureRecognizer：长按1234567891011121314151617181920import UIKit class ViewController``: ``UIViewController {`` ``override func viewDidLoad() {`` ``super``.viewDidLoad()`` ``//长按监听`` ``let longPress=``UILongPressGestureRecognizer``(target:``self``,action:``"longPressDid:"``)`` ``self``.view.addGestureRecognizer(longPress)`` ``}`` ``func longPressDid(sender: ``UILongPressGestureRecognizer``){`` ``if sender.state == .``Began {`` ``print``(``"长按响应开始"``)`` ``} ``else {`` ``print``(``"长按响应结束"``)`` ``}`` ``}``}
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