CODEWITHSUNDEEP
objective-ceventsuiviewtouchstacked
Dubon Ya'ar
Dubon Ya'ar

Reputation: 411

Receiving touch events on more then one UIView simultaneously

I have a bunch of UIViews stacked one upon the other(not nested). I want them all to react to touch, but it seems that the topmost view obscures the views beneath it, preventing them from receiving touch events.

At first i thought i’d catch all touch events with the topmost view, and then manually call
hitTest, or pointInside methods on all the underlying views, but i found out that both methods are somehow private(could it be?) and cannot be accessed.

Any ideas how to pull it off?

Upvotes: 3

Views: 4565

Answers (2)

Jonah
Jonah

Reputation: 17958

Touches are sent to a single view. That view can then optionally pass them up the responder chain. If you want to handle touches to a collection of views you should have them forward those events up to the next responder and have a common parent of all of them (or their view controller since the controller is also part of the responder chain) handle those touches.

https://developer.apple.com/library/mac/documentation/General/Devpedia-CocoaApp-MOSX/Responder.html

Upvotes: 3

Bruno Domingues
Bruno Domingues

Reputation: 1015

You can check if the touch is for your topmost view. If it doesn't you can call the same method of your superview. Something like [self.superview sameMethod:sameParameter].

Your topmost view has a method

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

Inside that method you are doing your logic right? Inside the method can't you check if the touch received is at your topmost view with

UITouch *touch = [touches anyObject];
[touch locationInView:self];

And if it doesn't you pass it to the superView's same method using 

[self.superview touchesEnded:touches withEvent:event];

Upvotes: 3

Related Questions