UIGestureRecognizer是一個(gè)抽象類，定義了所有手勢的基本行為，它有6個(gè)子類處理具體的手勢：
1.UITapGestureRecognizer （任意手指任意次數(shù)的點(diǎn)擊）
// 點(diǎn)擊次數(shù)
numberOfTapsRequired
// 手指個(gè)數(shù)
numberOfTouchesRequired
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];
[tapGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[tapGestureRecognizer setNumberOfTapsRequired:2];
[tapGestureRecognizer setNumberOfTouchesRequired:2];
[self.view addGestureRecognizer:tapGestureRecognizer];
2.UIPinchGestureRecognizer （兩個(gè)手指捏合動(dòng)作）
// 手指捏合，大于1表示兩個(gè)手指之間的距離變大，小于1表示兩個(gè)手指之間的距離變小
scale
// 手指捏合動(dòng)作時(shí)的速率（加速度）
velocity
UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] init];
[pinchGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[self.view addGestureRecognizer:pinchGestureRecognizer];
3.UIPanGestureRecognizer (搖動(dòng)或者拖拽)
// 最少手指個(gè)數(shù)
minimumNumberOfTouches
// 最多手指個(gè)數(shù)
maximumNumberOfTouches
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];
[panGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[panGestureRecognizer setMinimumNumberOfTouches:1];
[panGestureRecognizer setMaximumNumberOfTouches:5];
[self.view addGestureRecognizer:panGestureRecognizer];
4.UISwipeGestureRecognizer (手指在屏幕上滑動(dòng)操作手勢)
// 滑動(dòng)手指的個(gè)數(shù)
numberOfTouchesRequired
// 手指滑動(dòng)的方向 （Up,Down,Left,Right）
direction
UISwipeGestureRecognizer *swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] init];
[swipeGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[swipeGestureRecognizer setNumberOfTouchesRequired:2];
[swipeGestureRecognizer setDirection:UISwipeGestureRecognizerDirectionRight];
[self.view addGestureRecognizer:swipeGestureRecognizer];
5.UIRotationGestureRecognizer (手指在屏幕上旋轉(zhuǎn)操作)
// 旋轉(zhuǎn)方向，小于0為逆時(shí)針旋轉(zhuǎn)手勢，大于0為順時(shí)針手勢
rotation
// 旋轉(zhuǎn)速率
velocity
UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] init];
[rotationGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[self.view addGestureRecognizer:rotationGestureRecognizer];
6.UILongPressGestureRecognizer (長按手勢)
numberOfTapsRequired
// 需要長按的手指的個(gè)數(shù)
numberOfTouchesRequired
// 需要長按的時(shí)間，最小為0.5s
minimumPressDuration
// 手指按住允許移動(dòng)的距離
allowableMovement
UILongPressGestureRecognizer *longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] init];
[longPressGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[longPressGestureRecognizer setMinimumPressDuration:1.0f];
[longPressGestureRecognizer setAllowableMovement:50.0];
[self.view addGestureRecognizer:longPressGestureRecognizer];
