iOS手勢UIGestureRecognizer

UIGestureRecognizer是一個抽象類，定義了所有手勢的基本行爲，它有6個子類處理具體的手勢：

1.UITapGestureRecognizer （任意手指任意次數的點擊）

// 點擊次數

numberOfTapsRequired

// 手指個數

numberOfTouchesRequired   

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];
[tapGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[tapGestureRecognizer setNumberOfTapsRequired:2];
[tapGestureRecognizer setNumberOfTouchesRequired:2];
[self.view addGestureRecognizer:tapGestureRecognizer];
[tapGestureRecognizer release];

2.UIPinchGestureRecognizer （兩個手指捏合動作）

// 手指捏合，大於1表示兩個手指之間的距離變大，小於1表示兩個手指之間的距離變小

scale

// 手指捏合動作時的速率（加速度）

velocity

UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] init];
[pinchGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[self.view addGestureRecognizer:pinchGestureRecognizer];
[pinchGestureRecognizer release];

3.UIPanGestureRecognizer (搖動或者拖拽)

// 最少手指個數

minimumNumberOfTouches

// 最多手指個數

maximumNumberOfTouches

UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];
[panGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[panGestureRecognizer setMinimumNumberOfTouches:1];
[panGestureRecognizer setMaximumNumberOfTouches:5];
[self.view addGestureRecognizer:panGestureRecognizer];
[panGestureRecognizer release];

4.UISwipeGestureRecognizer (手指在屏幕上滑動操作手勢)

// 滑動手指的個數

numberOfTouchesRequired

// 手指滑動的方向 （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];
[swipeGestureRecognizer release];

5.UIRotationGestureRecognizer (手指在屏幕上旋轉操作)

// 旋轉方向，小於0爲逆時針旋轉手勢，大於0爲順時針手勢

rotation

// 旋轉速率

velocity

UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] init];
[rotationGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[self.view addGestureRecognizer:rotationGestureRecognizer];
[rotationGestureRecognizer release];

6.UILongPressGestureRecognizer (長按手勢)

// Default is 0. The number of full taps required before the press for gesture to be recognized

numberOfTapsRequired

// 需要長按的手指的個數

numberOfTouchesRequired

// 需要長按的時間，最小爲0.5s

minimumPressDuration

// 手指按住允許移動的距離

allowableMovement

UILongPressGestureRecognizer *longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] init];
[longPressGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];
[longPressGestureRecognizer setMinimumPressDuration:1.0f];
[longPressGestureRecognizer setAllowableMovement:50.0];
[self.view addGestureRecognizer:longPressGestureRecognizer];
[longPressGestureRecognizer release];