Prevent disabled UIButton from propagating touch events

user_64167 0
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My application has two overlapping UIButtons. The top button may be disabled at times. However, in this case any touch events it receives seem to be passed down to the underlying view, which in my case is the other button.

What I need is the top button intercepting all touches and preventing them from reaching the bottom button, even in disabled state (I would be happy even if it's designated action is invoked in the disabled state).

So far I've tried:

[topButton setUserInteractionEnabled:YES];

and

[topButton setExclusiveTouch:YES];

though the later case is probably undesirable since I still need the bottom button responding to events if it's the first view clicked. Either way none of them work.

uibutton event-handling objective-c iphone cocoa-touch
6 Answers

I know that is late, but I was reading a lot of similar questions and none of the answers I read was helpful for me (some of them because didn't work and others because I didn't like that solution), so I found a better solution forme and I share it here to help possible future users which read this question.

Solution

I always have a container with some (or only one) buttons inside. So I connect the IBOutlet of the buttons container to the UIViewController or UIView which I'm working with:

@property (weak, nonatomic) IBOutlet UIView *buttonsContainer;

And I set a nil single tap gesture recognizer like below:

[self.buttonsContainer addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:nil]];

With this workaround, if a button is disabled, the buttonsContainer captures this event and do nothing with it.

Hope this helps.

user_97718400

Create a subclass of the button, then override these methods so that the button will catch events but ignore them if some property of the button is set to NO:

touchesBegan:withEvent:
touchesCancelled:withEvent:
touchesEnded:withEvent:
touchesMoved:withEvent:

These are methods of UIResponder.

Have them just call their [super ...] method if you want the event handled, otherwise just don't call it and return if you want the events "eaten".

Also see this in case it's necessary: Observing pinch multi-touch gestures in a UITableView

user_2425420
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