iOS学习-手势

//     手势 iOS系统支持七种手势类型//    UIGestureRecognizer 是手势类，他是一个抽象类，我们一般不用它来进行实例化和使用，二十用它的子类//     1、轻拍手势    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];    // 添加手势    [self.view addGestureRecognizer:tap];    [self.myLabel addGestureRecognizer:tap];        [tap release];    // 需要轻拍的次数    tap.numberOfTapsRequired = 2;    // 需要几个手指    tap.numberOfTouchesRequired = 2;        // 2、长按手势    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];    [self.myLabel addGestureRecognizer:longPress];    // 长按次数    longPress.minimumPressDuration = 2;    [longPress release];        // 3、旋转手势    UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];    [self.myLabel addGestureRecognizer:rotationGesture];    [rotationGesture release];        // 4、轻扫手势 默认是从左往右扫    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];    swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;    [self.myLabel addGestureRecognizer:swipeGesture];    [swipeGesture release];