iphone - single tap gesture conflicts with double one

29
votes

I have a view. I wish to define to kinds of tap gestures for it.

So if a user single tap on the view, view will do A; and if a user double tap on the view, it will do B without doing A.

I added two UITapGestureRecognizer to the view. the single tap is with numberOfTapsRequired = 1; and the double tap is with numberOfTapsRequired = 2;

Also I set return NO for

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
     return NO;
}

However, I found that they conflict with each other. I mean, even if I double tap on the view, both A and B will be invoked.

How can I solve this problem?

Thanks

1
iphoneuigesturerecognizertap

1 Answers

65
votes

You can work around this by adding the following line of code. This will make sure that the single tap recognizer only fires when the double tap recognizer failed:

    [singleTapRecognizer requireGestureRecognizerToFail:doubleTapRecognizer];