ios开发——实用技术篇Swift篇&多点触摸与手势识别

多点触摸与手势识别

         //点击事件
         var atap = UITapGestureRecognizer(target: self, action: "tapDo:")
         self.view.addGestureRecognizer(atap)
         atap.numberOfTapsRequired =  //单击次数
         atap.numberOfTouchesRequired =  //手指个数

         //拖动事件
         var aPan = UIPanGestureRecognizer(target: self, action: "handlenPan:")
         self.view.addGestureRecognizer(aPan)
         aPan.minimumNumberOfTouches =  //最少手指个数
         aPan.maximumNumberOfTouches =  //最多手指个数

         //长按事件
         var aLongPress = UILongPressGestureRecognizer(target: self, action: "longPress:")
         self.view.addGestureRecognizer(aLongPress)
         aLongPress.minimumPressDuration =  //需要长按的时间，最小0.5s

         //捏合事件
         var aPinch = UIPinchGestureRecognizer(target: self, action: "pinchDo:")
         self.view.addGestureRecognizer(aPinch)

         //旋转事件
         var aRotation = UIRotationGestureRecognizer(target: self, action: "rotatePiece:")
         self.view.addGestureRecognizer(aRotation)

         //轻扫事件--左轻扫
         var leftSwipe = UISwipeGestureRecognizer(target: self, action: "leftSwipe:")
         self.view.addGestureRecognizer(leftSwipe)
         leftSwipe.direction =  UISwipeGestureRecognizerDirection.Left

         //轻扫事件--右轻扫
         var rightSwipe = UISwipeGestureRecognizer(target: self, action: "rightSwipe:")
         self.view.addGestureRecognizer(rightSwipe)
         rightSwipe.direction =  UISwipeGestureRecognizerDirection.Right

         //轻扫事件--上轻扫
         var upSwipe = UISwipeGestureRecognizer(target: self, action: "upSwipe:")
         self.view.addGestureRecognizer(upSwipe)
         upSwipe.direction =  UISwipeGestureRecognizerDirection.Up

         //轻扫事件--下轻扫
         var downSwipe = UISwipeGestureRecognizer(target: self, action: "downSwipe:")
         self.view.addGestureRecognizer(downSwipe)
         downSwipe.direction =  UISwipeGestureRecognizerDirection.Down
     }

     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
     }

     /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
         // Get the new view controller using segue.destinationViewController.
         // Pass the selected object to the new view controller.
     }
     */

     //触摸事件

     //手指首次触摸到屏幕

 //    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {

         //2015年5月2后修改,另外：touches --》(touches as NSSet)
     override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
         println("touchesBegan")

         //获取touches数量
         let numTouches = touches.count

         //获取点击屏幕的次数
         let tapTouches = (touches as NSSet).anyObject()?.tapCount

         //获取事件发生时间
         let timestamp = event.timestamp

         //获取当前相对于self.view的坐标
         let locationPoint = (touches as NSSet).anyObject()?.locationInView(self.view)

         //获取上一次相对于self.view的坐标
         let previousPoint = (touches as NSSet).anyObject()?.previousLocationInView(self.view)

         //允许使用手势
         self.view.userInteractionEnabled = true

         //支持多点触摸
         self.view.multipleTouchEnabled = true

         println("\(tapTouches)")

         //判断如果有两个触摸点

         {
             //获取触摸集合
             let twoTouches = (touches as NSSet).allObjects

             //获取触摸数组
             let first:UITouch = twoTouches[] as! UITouch //第1个触摸点
             let second:UITouch = twoTouches[]as! UITouch //第2个触摸点

             //获取第1个点相对于self.view的坐标
             let firstPoint:CGPoint = first.locationInView(self.view)

             //获取第1个点相对于self.view的坐标
             let secondPoint:CGPoint = second.locationInView(self.view)

             //计算两点之间的距离
             let deltaX = secondPoint.x - firstPoint.x;
             let deltaY = secondPoint.y - firstPoint.y;
             let initialDistance = sqrt(deltaX*deltaX + deltaY*deltaY )

             println("两点间距离是：\(initialDistance)")
         }
     }

     //手指在移动
 //    override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {

     //2015年5月2后修改
     override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {

         println("touchesMoved")
     }

     //触摸结束
 //    override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {

     //2015年5月2后修改
     override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {

         println("touchesEnded")
     }

     //触摸意外终止
     //模拟器演示：鼠标拖动的同时，按键盘command+shift+h 相当于点击手机home键，退出应用，触发touchesCancelled事件，在打电话、等情况下也会触发
 //    override func touchesCancelled(touches: NSSet!, withEvent event: UIEvent!) {

     //2015年5月2后修改
     override func touchesCancelled(touches: Set<NSObject>!, withEvent event: UIEvent!) {

         println("touchesCancelled")
     }

     //手势

     //点击事件
     func tapDo(sender:UITapGestureRecognizer)
     {

         println("点击事件")
     }

     //拖动事件
     func handlenPan(sender:UIPanGestureRecognizer)
     {
         println("拖动事件")

         if sender.state == .Began
         {
             //拖动开始
         }
         else if sender.state == .Changed
         {
             //拖动过程
         }
         else if sender.state == .Ended
         {
             //拖动结束
         }
     }

     //长摁事件
     func longPress(sender:UILongPressGestureRecognizer)
     {
         println("长摁事件")

     }

     //捏合事件
     func pinchDo(sender:UIPinchGestureRecognizer)
     {
         println("捏合")
     }

     //旋转事件
     func rotatePiece(sender:UIRotationGestureRecognizer)
     {
         println("旋转")
     }

     //轻扫事件--左轻扫
     func leftSwipe(sender:UISwipeGestureRecognizer)
     {
         println("左轻扫")
     }

     //轻扫事件--右轻扫
     func rightSwipe(sender:UISwipeGestureRecognizer)
     {
         println("右轻扫")
     }

     //轻扫事件--上轻扫
     func upSwipe(sender:UISwipeGestureRecognizer)
     {
         println("上轻扫")
     }

     //轻扫事件--下轻扫
     func downSwipe(sender:UISwipeGestureRecognizer)
     {
         println("下轻扫")
     }