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POiPhone Instruments Leaks is confusing me. UIView fade out animation causes a lot of tiny leaks
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copied!<p>I'm trying to kill all memory leaks in my iPhone 3.0 application. CLANG builds with all lights green so now I'm analyzing with Instruments. </p> <p>This is easier said then done, since it is indicating hundreds of 16 byte leaks after just a few minutes of using the app. It seams to be mainly in UIKit, and the common part is that the end of the stack trace always calls <code>[NSObject respondsToSelector]</code></p> <p>Is this something I can ignore or what can be the reason for all these leaks? I I can ignore them, is there a way to filter them out in Instruments, so I can detect the real leaks?</p> <p>*EDIT I managed to find the part of my code that caused the problem, but I still don't understand why. I have a custom UIView with some text and a spinner that is visible during an async http request. When the request is done I call this method on the view:</p> <pre><code>- (void)fadeOut{ spinner.hidden = YES; loadingLabel.hidden = YES; messageLabel.hidden = YES; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(fadeComplete)]; [UIView setAnimationDuration:0.40]; self.alpha = 0.0; [UIView commitAnimations]; } - (void)fadeComplete{ [self removeFromSuperview]; } </code></pre> <p>If I instead simply do</p> <p><code>[self removeFromSuperView]</code> without the alpha animation, there is no leaks reported.</p> <p>See the screenshot below for Instruments details.</p> <p><a href="http://img.skitch.com/20091123-kr98nky7nqdeuqjm4n9khbug9j.png" rel="nofollow noreferrer">Instruments Screenshot</a></p> <p>A sample stack trace:</p> <pre><code> 0 libobjc.A.dylib _malloc_internal 1 libobjc.A.dylib _cache_addForwardEntry 2 libobjc.A.dylib lookUpMethod 3 libobjc.A.dylib class_respondsToSelector 4 CoreFoundation -[NSObject respondsToSelector:] 5 UIKit -[UINavigationTransitionView transition:fromView:toView:] 6 UIKit -[UINavigationTransitionView transition:toView:] 7 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:] 8 UIKit -[UINavigationController _startDeferredTransitionIfNeeded] 9 UIKit -[UINavigationController viewWillLayoutSubviews] 10 UIKit -[UILayoutContainerView layoutSubviews] 11 UIKit -[UIView(CALayerDelegate) _layoutSublayersOfLayer:] 12 QuartzCore -[CALayer layoutSublayers] 13 QuartzCore CALayerLayoutIfNeeded 14 QuartzCore CA::Context::commit_transaction(CA::Transaction*) 15 QuartzCore CA::Transaction::commit() 16 QuartzCore CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) 17 CoreFoundation __CFRunLoopDoObservers 18 CoreFoundation CFRunLoopRunSpecific 19 CoreFoundation CFRunLoopRunInMode 20 GraphicsServices GSEventRunModal 21 GraphicsServices GSEventRun 22 UIKit -[UIApplication _run] 23 UIKit UIApplicationMain 24 Client main **/main.m:14 25 Client start </code></pre> <p>And another one:</p> <pre><code> 0 libobjc.A.dylib _malloc_internal 1 libobjc.A.dylib _cache_addForwardEntry 2 libobjc.A.dylib lookUpMethod 3 libobjc.A.dylib class_respondsToSelector 4 CoreFoundation -[NSObject respondsToSelector:] 5 UIKit -[UIViewAnimationState animationDidStart:] 6 QuartzCore run_animation_callbacks(double, void*) 7 QuartzCore CA::timer_callback(__CFRunLoopTimer*, void*) 8 CoreFoundation CFRunLoopRunSpecific 9 CoreFoundation CFRunLoopRunInMode 10 GraphicsServices GSEventRunModal 11 GraphicsServices GSEventRun 12 UIKit -[UIApplication _run] 13 UIKit UIApplicationMain 14 Client main ***/main.m:14 15 Client start </code></pre>

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