Forwarding Touches From UIScrollView - UIButton Issues - ios

Question

I have been trying to figure out how to forward the touches from a UIScrollView to its superview. The reason is for sort of a cursor to follow the touch. Anyway, the scrollview is populated with UIButtons. My code for forwarding the touch is to use delegation in a scrollview subclass:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesBegan:touches withEvent:event];
if ([[self tfDelegate]respondsToSelector:#selector(tfDelegateBegan:)]) {
[[self tfDelegate]tfDelegateBegan:[touches anyObject]];
}
NSLog(#"touches began");
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesMoved:touches withEvent:event];
if ([[self tfDelegate]respondsToSelector:#selector(tfDelegateMoved:)]) {
[[self tfDelegate]tfDelegateMoved:[touches anyObject]];
}
NSLog(#"touches moved");
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesEnded:touches withEvent:event];
if ([[self tfDelegate]respondsToSelector:#selector(tfDelegateEnded:)]) {
[[self tfDelegate]tfDelegateEnded:[touches anyObject]];
}
NSLog(#"touches ended");
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesCancelled:touches withEvent:event];
if ([[self tfDelegate]respondsToSelector:#selector(tfDelegateCancelled:)]) {
[[self tfDelegate]tfDelegateCancelled:[touches anyObject]];
}
NSLog(#"touches cancelled");
}
However, I have learned that UIScrollviews operate via UIGestureRecognizers, so these methods aren't even called by default. I realize that the gesture recognizers are exposed in iOS 5 but I need to support 4.0 as well. I did this instead:
NSArray *a = [[theScrollview gestureRecognizers]retain];
for (UIGestureRecognizer *rec in a) {
if ([rec isKindOfClass:[UIPanGestureRecognizer class]]) {
NSLog(#"this is the pan gesture");
rec.cancelsTouchesInView = NO;
}
}
This allows the gesture to work and the touches methods to be called simultaneously. The issue is, now if you try to scroll while touching a button, the button can be pressed while scrolling. Normally, the scroll cancels the button and the only time a button can be pressed is if the scrollview is not scrolling.
This is the desired functionality. Any suggestions on how I might achieve this?

Answer 1

Maybe try controlling the button action using a flag that would prevent the event from firing if the scroll view is scrolling.
BOOL isScrolling = NO;
- (void) scrollViewWillBeginDragging:(UIScrollView *)scrollView {
isScrolling = YES;
}
- (void) scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
isScrolling = NO;
}
- (void) didTapButton {
if(isScrolling)
return;
//Do Button Stuff
}