UITapGestureRecognizer

@property(nonatomic) NSUInteger numberOfTapsRequired
@property(nonatomic) NSUInteger numberOfTouchesRequired

    // 单击的 Recognizer
    UITapGestureRecognizer* singleRecognizer;
    singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(SingleTap：)];
    //点击的次数
    singleRecognizer.numberOfTapsRequired = 1; // 单击
    [self.view addGestureRecognizer:singleRecognizer];
    
    // 双击的 Recognizer
    UITapGestureRecognizer* doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(DoubleTap：)];
    doubleRecognizer.numberOfTapsRequired = 2; // 双击
    //关键语句，给self.view添加一个手势监测；
    [self.view addGestureRecognizer:doubleRecognizer];
    
    // 关键在这一行，双击手势确定监测失败才会触发单击手势的相应操作
    [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];
    [singleRecognizer release];
    [doubleRecognizer release];