iphone开发中的手势操作：Multiple Taps

用Automatic Gesture Recognition实现： 

在viewDidLoad中

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UITapGestureRecognizer *singleTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(tap1)];
    singleTap.numberOfTapsRequired = 1;
    singleTap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:singleTap];
    
    UITapGestureRecognizer *doubleTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(tap2)];
    doubleTap.numberOfTapsRequired = 2;
    doubleTap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:doubleTap];
    [singleTap requireGestureRecognizerToFail:doubleTap];
    
    UITapGestureRecognizer *tripleTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(tap3)];
    tripleTap.numberOfTapsRequired = 3;
    tripleTap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:tripleTap];
    [doubleTap requireGestureRecognizerToFail:tripleTap];
    
    UITapGestureRecognizer *quadrupleTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(tap4)];
    quadrupleTap.numberOfTapsRequired = 4;
    quadrupleTap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:quadrupleTap];
    [tripleTap requireGestureRecognizerToFail:quadrupleTap];
}

添加自定义响应方法：

- (void)tap1 {
    singleLabel.text = @"Single Tap Detected";
    [self performSelector:@selector(eraseMe:)
               withObject:singleLabel afterDelay:1.6f];
}

- (void)tap2 {
    doubleLabel.text = @"Double Tap Detected";
    [self performSelector:@selector(eraseMe:)
               withObject:doubleLabel afterDelay:1.6f];
}

- (void)tap3 {
    tripleLabel.text = @"Triple Tap Detected";
    [self performSelector:@selector(eraseMe:)
               withObject:tripleLabel afterDelay:1.6f];
}

- (void)tap4 {
    quadrupleLabel.text = @"Quadruple Tap Detected";
    [self performSelector:@selector(eraseMe:)
               withObject:quadrupleLabel afterDelay:1.6f];
}

- (void)eraseMe:(UILabel *)label {
    label.text = @"";
}

其实也可以直接在touchesBegan中自己实现功能：

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    NSUInteger tapCout = [touch tapCount];
    
    switch (tapCout) {
        case 1:
            [self performSelector:@selector(tap1) withObject:nil afterDelay:.4];//延迟执行
            break;
        case 2:
            [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tap1) object:nil];//取消tap1
            [self performSelector:@selector(tap2) withObject:nil afterDelay:.4];
            break;
        case 3:
            [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tap2) object:nil];//取消tap2
            [self performSelector:@selector(tap3) withObject:nil afterDelay:.4];
            break;
        case 4:
            [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tap3) object:nil];//取消tap3
            [self tap4];
            break;
        default:
            break;
    }
}

that‘s all.