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POUICollectionView crash on unhighlightAllItems
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copied!<p>I've gotten several crash reports related to a UICollectionView in iOS 7. I'm not able to consistently recreate this crash.</p> <pre><code>Exception Type: SIGSEGV Exception Codes: SEGV_ACCERR at 0x91c4392b Crashed Thread: 0 Application Specific Information: *** Terminating app due to uncaught exception '', reason: '' Thread 0 Crashed: 0 libobjc.A.dylib 0x39dd2b26 objc_msgSend + 6 1 UIKit 0x31fd5eef -[UICollectionView cellForItemAtIndexPath:] + 111 2 UIKit 0x32060bfd -[UICollectionView _unhighlightItemAtIndexPath:animated:notifyDelegate:] + 149 3 UIKit 0x32383947 -[UICollectionView _unhighlightAllItems] + 151 4 UIKit 0x3205f9fb -[UICollectionView touchesBegan:withEvent:] + 367 5 UIKit 0x31fcb101 forwardTouchMethod + 233 6 UIKit 0x31fcb101 forwardTouchMethod + 233 7 UIKit 0x31e3be4b _UIGestureRecognizerUpdate + 5523 8 UIKit 0x31e73c41 -[UIWindow _sendGesturesForEvent:] + 773 9 UIKit 0x31e735e7 -[UIWindow sendEvent:] + 667 10 UIKit 0x31e48a25 -[UIApplication sendEvent:] + 197 11 UIKit 0x31e47221 _UIApplicationHandleEventQueue + 7097 12 CoreFoundation 0x2f69e18b __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15 13 CoreFoundation 0x2f69d6e1 __CFRunLoopDoSources0 + 341 14 CoreFoundation 0x2f69be4f __CFRunLoopRun + 623 15 CoreFoundation 0x2f606ce7 CFRunLoopRunSpecific + 523 16 CoreFoundation 0x2f606acb CFRunLoopRunInMode + 107 17 GraphicsServices 0x342f4283 GSEventRunModal + 139 18 UIKit 0x31ea8a41 UIApplicationMain + 1137 19 JackThreadsIpad 0x000922b7 main (main.m:16) </code></pre> <p>The UICollectionViewCells in the app share a common superclass that manages highlighting. When the cell is highlighted the alpha changes. </p> <pre><code>- (void)setHighlighted:(BOOL)highlighted { [super setHighlighted:highlighted]; if (highlighted) { self.alpha = 0.8; } else { self.alpha = 1.0; } } </code></pre> <p>Could calling [super setHighlighted:highlighted] cause a crash like this? The app was compiled and submitted with XCode 4 and is only happening on iOS 7. Any other suggestions to figure out where this is happening. Thanks for your help.</p> <p>Edit: I was able to catch this in the debugger, but it still is not consistently reproducible. The crash is:</p> <pre><code>[NSIndexPath section] message sent to deallocated instance XXXXXXXX </code></pre>

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