How to cancel/reset an UIGestureRecognizer

I got it! :-)

Maybe someone else runs in this problem, here is the solution:

if (waitForSomething) {
    recognizer.enabled = NO;
    recognizer.enabled = YES;
    return;
}

The next event will be UIGestureRecognizerStateFailed followed by UIGestureRecognizerStateBegan.