Adding a UITapGestureRecognizer to a view then removing seems to short circuit button events

Posted by heymon on Stack Overflow See other posts from Stack Overflow or by heymon
Published on 2010-05-29T21:46:40Z Indexed on 2010/05/29 21:52 UTC
Read the original article Hit count: 456

In the code below I am popping up a ImageView as the result of a users touchUpInside on a simple info button. There are other buttons on the view.

To dismiss the info I added a UITapGestureRecognizer to my controllers view, and hide the view when the tap is detected.

If I don't remove the tapGestureRecognizer, the action is called every time some.

Even when I do remove the gesture action, no bottons receive touchUpInside events once this gesture recognizer is added. Why?

Code from my MainViewController

  • (void) dismissInfo: (UITapGestureRecognizer *)gesture { [kInfoView setHidden: YES]; [gesture removeTarget: self action: NULL]; }

  • (IBAction) displayInfo {

    CGRect startFrame = CGRectMake(725, 25, 0, 0), origFrame; CGFloat yCenter = [kInfoView frame].size.height/2 + 200; CGPoint startCenter = CGPointMake(724, 25), displayCenter = CGPointMake(384, yCenter); UITapGestureRecognizer *g = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(dismissInfo:)];

    [self.view addGestureRecognizer: g]; origFrame = [kInfoView frame]; [kInfoView setCenter: startCenter]; [kInfoView setHidden: NO]; [kInfoView setFrame: startFrame];

    [UIView beginAnimations: @"info" context: nil]; [UIView setAnimationDuration: .5]; [UIView setAnimationDelegate: self];

    [kInfoView setFrame: origFrame]; [kInfoView setCenter: displayCenter];

    [UIView commitAnimations]; }

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