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Gesture recognition causes my app to crash.


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#1 blueshogun96   Crossbones+   -  Reputation: 1507

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Posted 27 August 2014 - 10:13 AM

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.

 

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.


Follow Shogun3D on the official website: http://shogun3d.net

 

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#2 L. Spiro   Crossbones+   -  Reputation: 18195

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Posted 28 August 2014 - 09:34 PM

Ensure that your device is running iOS 3.2 or greater.


L. Spiro

#3 blueshogun96   Crossbones+   -  Reputation: 1507

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Posted 28 August 2014 - 09:36 PM

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.


Follow Shogun3D on the official website: http://shogun3d.net

 

blogger.png twitter.png tumblr_32.png facebook.png

 

"Yo mama so fat, she can't be frustum culled." - yoshi_lol

 

"One objection to a “critique of C#” would be that you can’t talk about C# without talking about the whole “.Net experience”. However, one can approach the topic of Hitler without a complete discussion of Nationalist Socialism, so I feel justified." - Steve White.


#4 L. Spiro   Crossbones+   -  Reputation: 18195

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Posted 28 August 2014 - 09:40 PM

https://developer.apple.com/library/ios/documentation/uikit/reference/UIGestureRecognizer_Class/Reference/Reference.html#//apple_ref/occ/cl/UIGestureRecognizer
Read Usage Special Considerations and add a run-time check to get more information about its capabilities.

 

 

L. Spiro



#5 L. Spiro   Crossbones+   -  Reputation: 18195

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Posted 29 August 2014 - 04:11 AM

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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