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Gesture recognition causes my app to crash.

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I'm still pretty new to gesture recognition, and I've never needed it until now.  So, I've found various examples on the net, and when I try to implement it, my app just crashes when I touch the screen.  So anyway, this is what I did.

 

I added this to viewDidLoad

// Create and initialize a tap gesture
    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
                                             initWithTarget:self action:@selector(respondToTapGesture:)];
    
    // Specify that the gesture must be a single tap
    tapRecognizer.numberOfTapsRequired = 1;
    
    // Add the tap gesture recognizer to the view
    [self.view addGestureRecognizer:tapRecognizer];

Then I added this to the ViewController

- (void)respondToTapGesture:(UIGestureRecognizer *)gesture
{
    // Do whatever
}

What happens is I get a crash.  More specifically, I get an EXC_BAD_ACCESS.

 

[attachment=23338:Screen Shot 2014-08-27 at 9.11.42 AM.png]

 

That's the stack trace, if that helps.  I have absolutely no idea why this isn't working, when all of the examples appear to be working fine.  Did I forget to add something to plist?

 

Shogun.

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Ensure that your device is running iOS 3.2 or greater.


L. Spiro

 

My device is running iOS 7.1.2.  Since our last topic we've engaged regarding iOS devices, I've gotten my hands on a more modern iPhone.

 

Shogun.

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Erica Sadun is a friend of mine who helped me get my book deal and has given me advice on writing my first book.

She wrote this:

http://www.drdobbs.com/mobile/handling-touch-input-on-ios6/240144075

 

I haven’t used gestures directly as they are not useful in video games, but that covers the subject fairly exhaustively and may be of help.

 

 

L. Spiro

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