iOS UIScrollView cancel UIButton touch on scroll

Question

I have some UIButtons within a UIScrollView, but I do not want to delay the button touches. However, as soon as the scroll view detects a drag/scroll, I want to cancel the UIButton touch and proceed with the scrolling of the UIScrollView.

I have included the following...

_scrollView.delaysContentTouches = NO;

...but (obviously) the button touch does not cancel when dragged. Does anyone have any suggestions as to how I can implement this functionality?

Answer 1

You can override this method of UIScrollView.

-(BOOL)touchesShouldCancelInContentView:(UIView *)view
{   
    return YES;
}

And in your UIButton, you should add different method for different control events.

1. show highlight effect for UIControlEventTouchDown.
2. trigger button for UIControlEventTouchUpInside | UIControlEventTouchUpOutside;
3. clear highlight effect for UIControlEventTouchCancel.

Answer 2

You could use scrollViewWillBeginDragging to fire off a notification and handle the button canceling by listening for it in your buttons' code. I think this is what you are trying to do, but I'm not sure if I have understood your question correctly.