iOS---給視圖添加手勢

 初始化手勢同時添加手勢事件---把手勢添加到視圖上

 // 1.輕拍手勢類
    // 創建一個輕拍手勢 同時綁定了一個事件
    UITapGestureRecognizer *aTapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGRAction:)];
    // 設置輕拍次數
    aTapGR.numberOfTapsRequired = 1;
    
    // 設置手指觸摸的個數
    aTapGR.numberOfTouchesRequired = 2;
    
    // 添加手勢
    [self.rootView addGestureRecognizer:aTapGR];
    [aTapGR release];
   
    
    // 2.長按手勢
  UILongPressGestureRecognizer *longPressGR = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
    
    [self.rootView addGestureRecognizer:longPressGR];
    [longPressGR release];
 
    // 3.旋轉手勢
    UIRotationGestureRecognizer *rotationGR = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
    [self.rootView.testImageView addGestureRecognizer:rotationGR];
    [rotationGR release];
   
    // 4.捏合手勢
 UIPinchGestureRecognizer *pinchRG = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
    [self.rootView addGestureRecognizer:pinchRG];
    [pinchRG release];
  
    // 5.平移手勢
    
UIPanGestureRecognizer *panGR = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGRAction:)];
    [self.rootView.testImageView addGestureRecognizer:panGR];
    [panGR release];

    // 6.輕掃手勢
UISwipeGestureRecognizer *swipeGR = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGRAction:)];
    
    // 設置滑動方向 默認是從左往右
    swipeGR.direction = UISwipeGestureRecognizerDirectionLeft; // 設置向左滑動
    
    [self.rootView.testImageView addGestureRecognizer:swipeGR];
    [swipeGR release];

    // 7.屏幕邊緣輕掃識別器

    UIScreenEdgePanGestureRecognizer *screenPGR = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenEdgeGRAction:)];
    [self.rootView addGestureRecognizer:screenPGR];
    [screenPGR release];