在同一视图上点击并滑动手势

Question

I have two gesture tap and swipe on same view. Whenever user tries to swipe the view, tapGesture gets recognise. I want tap to be ignored in this case. How to do that. Below is the code. This is not the case of simultaneous recogniser because swipe gesture is not getting called.

     UITapGestureRecognizer *gest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(itemSelected:)];
     gest.numberOfTapsRequired = 1
     [messageView addGestureRecognizer:gest];

    UISwipeGestureRecognizer *swipeGest = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(itemSwiped:)];
    swipeGest.direction =  UISwipeGestureRecognizerDirectionUp ;
    [messageView addGestureRecognizer:swipeGest];

Answer 1

While the suggested answer is fine, a simpler solution might be to require the tap gesture to wait for the swipe gesture to fail using - (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer . This method "creates a relationship with another gesture recognizer that delays the receiver's transition out of UIGestureRecognizerStatePossible ." In your case, the code would look like:

[gest requireGestureRecognizerToFail:swipeGest];

You can find more information here .

Answer 2

In your handlers itemSelected and itemSwiped , be sure that you are checking the state of the UIGestureRecognizer .

Possible states include: possible , began , changed , ended , cancelled , and failed .

You should likely be looking for the ended state.