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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）

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

//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

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

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）

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）

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

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
    } 
}