Dragging an UIView inside UIScrollView with gesture recognizers enabled for sibling views

Question

I have a following view hierarchy in my app:

-- UIScrollView (canCancelContentTouches is NO)
   -- UIView #1 (UISwipeGestureRecognizer is bound to it to track horizontal swipes)
      -- UIView #2 (touchesBegan/touchesMoved/touchesEnded are implemented here to allow
                    dragging this view inside its parent; implementation is very
                    straightforward and I'm NOT calling supermethods here).

When I start dragging view #2, it sometimes triggers the swipe gesture recognizer. I can't really see the pattern, but this happens quite often.

Is there any way to suppress the touches processing while dragging?

Answer 1

Use a UIPanGestureRecognizer on view #2 instead of handling the touches directly. In the delegate for both recognizers, return NO from gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:.

OR

In the UISwipeGestureRecognizer's delegate, implement this:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    return gestureRecognizer.view == touch.view;
}