手势识别 ios

/**
 UIKit中包含了UIGestureRecognizer类，用于检测发生在设备中手势。
 UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，他有下面一些子类用于处理具体的手势：
 1.拍击UITapGestureRecognizer(任意次数的拍击)
 2.向里或向外捏 UIPinchGestureRecognizer(用于缩放)
 3.摇动或者拖拽 UIPanGestureRecognizer
 4.滑动 UISwipeGestureRecoginzer(以任意方向)
 5.旋转 UIRotationGestureRecoginzer (手指朝相反方向移动)
 6.长按 UILongPressGestureRecoginzer
 
 对于不同类型的手势识别器，具有不同的配置属性。比如UITapGestureRecognizer，可以配置拍击次数。界面接收到手势之后，可以发送一 个消息，用于处理响应手势动作后的任务。当然，不同的手势识别器，发送的消息方法也会有所不同。下面列举几个具体示例代码：
 */


#pragma mark 一个手指，拍击两次手势
-(void)test1{
    UITapGestureRecognizer *oneFingerTwoTaps =  [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(oneFingerTwoTaps)];
    // Set required taps and number of touches
    //敲击次数 随意设，不过一般情况都是不多于2此
    [oneFingerTwoTaps setNumberOfTapsRequired:2];
    //敲击手指数 随意设，不过要考虑用户使用
    [oneFingerTwoTaps setNumberOfTouchesRequired:1];
    
    // Add the gesture to the view
    //添加到View
    [self.view addGestureRecognizer:oneFingerTwoTaps];
}
//消息方法
-(void)oneFingerTwoTaps
{
    NSLog(@"敲击了。。。");
}

#pragma mark 一个手指滑动手势
-(void)test2
{
    UISwipeGestureRecognizer *oneFingerSwipeUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(oneFingerSwipeUp:)];
    
    
    //滑动方向<#(UISwipeGestureRecognizerDirection)#>枚举类型
    /*
     UISwipeGestureRecognizerDirectionRight = 1 << 0,
     UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
     UISwipeGestureRecognizerDirectionUp    = 1 << 2,
     UISwipeGestureRecognizerDirectionDown  = 1 << 3
     */
    [oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp ];
    [self.view addGestureRecognizer:oneFingerSwipeUp];
}
//消息方法
-(void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
{
    CGPoint point = [recognizer locationInView:self.view];
   NSLog(@"上滑 - start location: %f,%f", point.x, point.y);
}

#pragma mark 旋转手势
-(void)test3
{
    UIRotationGestureRecognizer *twoFingersRoatate = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(twoFingersRotate:)];
    [self.view addGestureRecognizer:twoFingersRoatate];
    
}
-(void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
{
    NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
}