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POMessage send to deallocated instance of viewcontroller when popviewcontroller
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  1. POMessage send to deallocated instance of viewcontroller when popviewcontroller
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    copied!<p>I'm developing an app using ARC with a navigation controller, the first view controller have a button linked to an ibaction that call the push of the second view controller. In the second viewcontroler a button pop the view controller to the first one. When popping sometimes my app crash with error: "-[Secondviewcontroller isKindOfClass:]: message sent to deallocated instance 0xb181c00".</p> <p>This is my code in first view controller for push second: (With instruments, using zombie i get a zombie message on this method).</p> <pre><code>-(void)apriCassettoRivista { [NSObject cancelPreviousPerformRequestsWithTarget:self]; Secondviewcontroller *rivista = [[Secondviewcontroller alloc] init]; [self.navigationController pushViewController:rivista animated:true]; } </code></pre> <p>The error detected is on the method that push the second view controller.. i 'can't understand this. I think the problem is in the second view controller..is possible? when popping second i use the following code:</p> <pre><code>-(IBAction)indietro:(id)sender { [NSObject cancelPreviousPerformRequestsWithTarget:self]; [self.navigationController popViewControllerAnimated:TRUE]; } </code></pre> <p>Can anyone help me? here is screen of zombie message: <a href="http://vincentvega.net/iphone/schermo.png" rel="nofollow">http://vincentvega.net/iphone/schermo.png</a></p> <p>In my second controller i have observer , too but i destroy them on view will disappear of secondviewcontroller.</p> <p><strong>UPDATE</strong> After several test i detect the problem is caused by render of CGPDFPageRef inside CATiledLayer..if I disable this function my app never crash.</p> <p><strong>SOLVED</strong> The solution was setting nil the delegate of all uiview catiledlayer in my scrollview with this function:</p> <pre><code>-(void)buttavia { NSArray *subviews = [mainScrolla subviews]; for (UIView *subview in subviews) { if ([subview isKindOfClass:[UIScrollView class]]) { // Ho uno scrolla // NSArray *subviewsScrolla = [subview subviews]; for (UIView *subviewScrolla in subviewsScrolla) { if ([subviewScrolla isKindOfClass:[UIView class]]) { // Ho una view nello scrolla // if (subviewScrolla) { ((CATiledLayer *)subviewScrolla.layer).delegate = nil; ((CATiledLayer *)subviewScrolla.layer).contents = nil; [subviewScrolla removeFromSuperview]; [subviewScrolla.layer removeFromSuperlayer]; } } } } } } </code></pre>
 

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