ios开发——实用技术OC－Swift篇&触摸与手势识别

 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")
     }
     

• state——手势状态view——手势发生视图

 - (void)viewDidLoad
 {
     [super viewDidLoad];
// 根据实例化方法，我们知道：
     // 1.有一个处理消息的对象，应该是self
     // 2.我们需要定义一个方法，当手势识别检测到的时候，运行
     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
     // setNumberOfTapsRequired 点按次数
     [tap setNumberOfTapsRequired:];
     // setNumberOfTouchesRequired 点按的手指数量
     [tap setNumberOfTouchesRequired:];
     // 把手势识别增加到视图上
     [self.demoView addGestureRecognizer:tap];
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchAction:)];
     [self.demoView addGestureRecognizer:pinch];
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationAction:)];
     [self.demoView addGestureRecognizer:rotation];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
     [self.demoView addGestureRecognizer:pan];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
     [self.demoView addGestureRecognizer:longPress];
// 向左扫
     UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
     [swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
     [self.view addGestureRecognizer:swipeLeft];
     // 向右扫
     UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
     [swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
     [self.view addGestureRecognizer:swipeRight];
     // 向上扫
     UISwipeGestureRecognizer *swipeTop = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
     [swipeTop setDirection:UISwipeGestureRecognizerDirectionUp];
     [self.view addGestureRecognizer:swipeTop];
     // 向下扫
     UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
     [swipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
     [self.view addGestureRecognizer:swipeDown];
 }
- (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (void)swipeAction:(UISwipeGestureRecognizer *)sender
 {
     NSLog(@"%d", sender.direction);
     switch (sender.direction) {
         case UISwipeGestureRecognizerDirectionLeft:
             NSLog(@"向左扫");
             break;
         case UISwipeGestureRecognizerDirectionRight:
             NSLog(@"向右扫");
             break;
         case UISwipeGestureRecognizerDirectionUp:
             NSLog(@"向上扫");
             break;
         case UISwipeGestureRecognizerDirectionDown:
             NSLog(@"向下扫");
             break;
         default:
             break;
     }
 }

 - (void)longPressAction:(UILongPressGestureRecognizer *)sender
 {
     // 我们可以利用demoView的Tag属性，默认时tag=0
     // 如果tag=0，我们放大一倍，否则，我们缩小一半
     CGFloat scale;
     ) {
         scale = 2.0;
         _demoView.tag = ;
     } else {
         scale = 0.5;
         _demoView.tag = ;
     }
sender.view.transform = CGAffineTransformScale(sender.view.transform, scale, scale);
 }
  

 - (void)panAction:(UIPanGestureRecognizer *)sender
 {
     // 在拖放手势中是需要考虑手指的状态的UIGestureRecognizerState
     // 在拖放手势中使用的状态是UIGestureRecognizerStateChanged
     // 通常在使用拖放手势的时候，当手指离开的时候，应该做一个很小的动作，提醒用户拖放完成
     if (sender.state == UIGestureRecognizerStateChanged) {
         // locationInView
         [_demoView setCenter:[sender locationInView:self.view]];
     } else if (sender.state == UIGestureRecognizerStateEnded) {
         [_demoView setBackgroundColor:[UIColor yellowColor]];
     }
 }

 - (void)rotationAction:(UIRotationGestureRecognizer *)sender
 {
     sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);
// 和捏合操作类似，旋转角度同样需要方福伟
     sender.rotation = 0.0f;
 }
#pragma mark - 捏合手势
 - (void)pinchAction:(UIPinchGestureRecognizer *)sender
 {
     // 有关转换的内容，我们在后续动画部分再继续
     sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.scale, sender.scale);
// 缩放功能很简单，但是不要忘记将比例复位
     sender.scale = 1.0f;
     NSLog(@"捏我了");
 }
#pragma mark - 点按手势
 - (void)tapAction:(UITapGestureRecognizer *)sender
 {
NSLog(@"点我了 %@", sender);
 }
#pragma mark - 手势触摸事件
 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
     NSLog(@"触摸事件！");
     // 1. 先取出UITouch对象
     // 2. 判断响应点击的UIView是不是我们需要的
     UITouch *touch = [touches anyObject];
     if ([touch view] == _imageView) {
         NSLog(@"点到图像了!");
     }
 }

Swift：

添加手势

         //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
     }

实现

     //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")
     }

 . 新建摇晃监听视图ShakeListenerView，并且设置canBecomeFirstResponder返回YES
 - (BOOL)canBecomeFirstResponder
 {
     return YES;
 }
 . 在Storyboard中将ViewController的View的Class设置为：ShakeListenerView
 . 在ViewController.m文件中增加：viewDidAppear和viewDidDisappear在视图出现和消失时成为/撤销第一响应者身份
 . 在视图控制器中增加手势监听方法：
 - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
 {
     if (event.subtype == UIEventSubtypeMotionShake) {
         NSLog(@"shake phone");
     }
 }
  #pragma mark - 要让ViewController支持摇晃，需要写三个方法
 // 1. 成为第一响应者，视图一出现时，就应该成为第一响应者
 - (void)viewDidAppear:(BOOL)animated
 {
     [self.view becomeFirstResponder];
     // 不要忘记去实现父类方法
     [super viewDidAppear:animated];
 }
// 2. 注销第一响应者，视图要关闭的时候，注销
 - (void)viewDidDisappear:(BOOL)animated
 {
     [self.view resignFirstResponder];
     // 不要忘记去实现父类方法
     [super viewDidDisappear:animated];
 }
// 3. 监听并处理移动事件，判断是否摇晃了手机
 - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
 {
     if (motion == UIEventSubtypeMotionShake) {
         NSLog(@"摇啊摇，摇到外婆桥！！！");
     }
 }