HitTest: withEvent: Doesn't work

Question

I am creating an application where I have a background view and I have six UIImageView as subzones. I have a UITapGestureRecognizer to see when one of the UIImageView , and the handleTap method below is what the gesture recognizer calls. However, when I run this, hitTest:withEvent: always returns a background view even when clicking on one of the images. Does this have anything to do with the event when I call hitTest?

thanks

 - (void) handleTap: (UITapGestureRecognizer *) sender { if (sender.state == UIGestureRecognizerStateEnded) { CGPoint location = [sender locationInView: sender.view]; UIView * viewHit = [sender.view hitTest:location withEvent:NULL]; NSLog(@"%@", [viewHit class]); if (viewHit == sender.view) {} else if ([viewHit isKindOfClass:[UIImageView class]]) { [self imageViewTapped: viewHit]; NSLog(@"ImageViewTapped!"); } } } 

Answer 1

UIImageView is configured by default to not log user interaction.

From the UIImageView documentation:

New image viewers are configured to ignore custom events by default. If you want to handle events in a custom subclass of UIImageView, you must explicitly change the value of the userInteractionEnabled - YES property after initializing the object.

So, immediately after initializing your views, you should:

 view.userInteractionEnabled = YES; 

This will enable interaction again, and you will be able to record touch events.

Answer 2

Your approach will be written there (one GR on the containing view), which will work, but it will cause our brain to damage the correct coordinate systems, which is definitely a problem in the hosted code.

The best answer is to attach N gesture recognizers to each of the UIImageViews. They can have the same target and use the same handleTap: method. HandleTap: can get a view without looking for any geometry like this:

 UIImageView *viewHit = (UIImageView *)sender.view;