How to cancel scrolling when subview is touched - iphone

Question

I have a scrollview with some subviews as tiles. The scrollview has its "Delays content touches" and "Cancellable Content Touches" set to YES.
I capture touches in each subview with touchesBegan, touchesEnded and touchesMoved.
When you tap a button and almost immediatly start to scroll, the button highlights and the scrollview do not scroll, without any code needed.
When I do exactly the same thing without changing anything, touching the view but outside the button, these touch methods are triggered, but the scrollview scrolls.
What may I do in those touch methods to cancel the scrolling when a touch is done outside the button to have the same behaviour that prevent the scrollview to scroll ?

Answer 1

I solved this adding this code in touchesBegan and touchesEnded when touch is catched by the subview.
UIView* superView = self.view.superview;
while (superView != nil) {
if ([superView isKindOfClass:[UIScrollView class]]) {
UIScrollView* superScroll = (UIScrollView*)superView;
superScroll.scrollEnabled = YES/NO; // put the right value depending on the touch method you are in
}
superView = superView.superview;
}

Answer 2

If you want to detect touches inside any of the subviews of the UIScrollView, you will have to subclass UIScrollView and override the touchesShouldBegin and touchesShouldCancelInContentView methods which are specifically created for this purpose.
Other than this, there is no way you can identify touches in the subviews as UIScrollView tends to handle all touches itself and doesn't pass them to its subviews.
Courtesy:-https://stackoverflow.com/a/392562/1865424
If you have any further issue regarding this.Happy to help you.

Answer 3

Depending on what you are trying to do, maybe you can add:
UILongPressGestureRecognizer *longPressDetect = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(disableScrolling:)];
[subView addGestureRecognizer:longPressDetect];
and then add a method that disable and re-enable the scrollView from scrolling such as:
-(void)disableScrolling:(UILongPressGestureRecognizer*)longPress {
if (gesture.state == UIGestureRecognizerStateBegan) {
scrollView.scrollEnabled = NO;
}
if (gesture.state == UIGestureRecognizerStateEnded) {
scrollView.scrollEnabled = YES;
}
}