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iphoneuiviewobjective-c++

Remove overlay view on touch

I defined a UIview as an overlay view:

self.disableViewOverlay = [[UIView alloc] initWithFrame:CGRectMake(0.0f,44.0f,320.0f,416.0f)];
self.disableViewOverlay.backgroundColor=[UIColor blackColor];
self.disableViewOverlay.alpha = 0;

Now I would like to disable the overlay view if a user taps on it...

[disableViewOverlay removeFromSuperview];

How do I find out if the user taps on this overlay view? Is there a "tapped" method just like a button has an IBAction?

Thanks!

Solution

  • You have two options:

    1. overriding hitTest in your UIView;

    2. overriding touchesBegan:withEvent:, touchesMoved:withEvent:, touchesEnded:withEvent: for greater control.

    Both approaches require that you subclass your UIView (the one you want to detect the tap on).

    Have a look at UIView Class Reference or UIResponder Class Reference respectively.

    If you do not want to subclass your UIView, another option is attaching it to a UITapGestureRecognizer:

     gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapOnView)];
 [self.disableViewOverlay addGestureRecognizer:gestureRecognizer];

    you would then disable the overlay in the handleTapOnView function. Gesture recognizers are available only from iOS 3.2 on.

    Check this: UITapGestureRecognizer Class Reference