添加手势

/ 1.轻拍手势类
    // 创建一个轻拍手势 同时绑定了一个事件
    UITapGestureRecognizer *aTapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGRAction:)];
    // 设置轻拍次数
    aTapGR.numberOfTapsRequired = 1;
    
    // 设置手指触摸的个数
    aTapGR.numberOfTouchesRequired = 2;
    
    // 添加手势
    [self.rootView addGestureRecognizer:aTapGR];
    [aTapGR release];