Ios – UITapGestureRecognizer tap on self.view but ignore subviews

iosuitapgesturerecognizer

I need to implement a feature that will invoke some code when I double tap on the self.view (view of UIViewCotroller). But the problem that I have other UI object on this view and I don't want to attach any recognizer object to all of them. I found this method below how to make gesture on my view and I know how it works. Right now I am in front of handicap which way to choose for create this recognizer ignoring subview. Any ideas? Thanks.

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
[doubleTap setNumberOfTapsRequired:2];
[self.view addGestureRecognizer:doubleTap];

Best Answer

You should adopt the UIGestureRecognizerDelegate protocol inside the self object and call the below method for checking the view. Inside this method, check your view against touch.view and return the appropriate bool (Yes/No). Something like this:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isDescendantOfView:yourSubView]) {
        return NO;
    }
    return YES;
}

Edit: Please, also check @Ian's answer!

Swift 5

// MARK: UIGestureRecognizerDelegate methods, You need to set the delegate of the recognizer
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
     if touch.view?.isDescendant(of: tableView) == true {
        return false
     }
     return true
}

Related Solutions

Ios – How to detect a tap gesture in subviews

You can grab the point of the tap off the gesture recognizer when your handler method is called respective to any view you wish using -locationInView:. Then, use the following method on UIView: - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event to get a reference to the actual sub view that was tapped remembering that the point you pass in is in the same coordinate space as the view.

Some code to get you started:

CGPoint point = [tapGestureRecognizer locationInView:parentView];
UIView *tappedView = [parentView hitTest:point withEvent:nil];

For hit testing to work the view needs to have the userInteractionEnabled property set to YES. Many views, such as UILabels have this set to NO by default. So prior to the above:

self.subviewOfInterest.userInteractionEnabled = YES;

Ios – How to detect tap and double tap at same time using UITapGestureRecognizer

Here is what I have used in one of my old projects, I hope it helps you out man.

UITapGestureRecognizer *singleTap = [[[UITapGestureRecognizer alloc] initWithTarget:    self action:@selector(doSingleTap)] autorelease];
singleTap.numberOfTapsRequired = 1; 
[self.view addGestureRecognizer:singleTap];

 UITapGestureRecognizer *doubleTap = [[[UITapGestureRecognizer alloc] initWithTarget:   self action:@selector(doDoubleTap)] autorelease];
 doubleTap.numberOfTapsRequired = 2; 
 [self.view addGestureRecognizer:doubleTap];

  [singleTap requireGestureRecognizerToFail:doubleTap];

Best Answer

Related Solutions

Ios – How to detect a tap gesture in subviews

Ios – How to detect tap and double tap at same time using UITapGestureRecognizer

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