Detect Double tap in UIScrollView

Question

How can I detect double tap in UIScrollview?

I tried:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ 
    UITouch *touch = [touches anyObject];

    if (touch.tapCount == 2) {
        // some operations here
    }
}   

But this is not detecting double tap in UIScrollView, is there any other way to detect double tap?

Regards

Answer 1

If you're targeting 3.2+ you could try using a UITapGestureRecognizer

UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:yourViewController action:@selector(tapGesture:)];
tap.numberOfTapsRequired = 2;
tap.numberOfTouchesRequired = 1;
[scrollView addGestureRecognizer:tap];
[tap release];

Then you handle the tap in your viewcontroller:

- (void)tapGesture:(UIGestureRecognizer*)gesture {
    // Do something
}

Answer 2

Use the below code for double tap.

-(void) viewDidLoad{
    // other necessary operations
    UITapGestureRecognizer* dTap = [[UITapGestureRecognizer alloc] initWithTarget : self  action : @selector (doubleTap:)];

    [doubleTap setDelaysTouchesBegan : YES];
    dTap.numberOfTapsRequired = 2;
    dTap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer : dTap];
    [dTap release];
}

- (void) doubleTap : (UIGestureRecognizer*) sender
{
    NSLog (@"Double tap Do operations here...");
}

Answer 3

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSUInteger numTaps = [[touches anyObject] tapCount];
    if (numTaps== 2) {
         //some operations here
    }
}

Use this Code