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POUIViewController is deallocated before delegate method is called
 

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    <p>I have <code>PreviewController</code> : <code>UIViewController</code> which is used to show document in full screen it's part of <code>UINavigationViewController</code>. Also it's delegate of <code>UISplitViewController</code>.</p> <p>When it's pushed, it hides <code>masterView</code> of <code>UISplitViewController</code>. (Methods 1 - 3 - 2 are called)</p> <p>When it disappears (by pressing "back" button), it shows <code>masterView</code> of <code>UISplitViewController</code>. (Methods 4 - 2 are called)</p> <p>But there is a way to force closing <code>PreviewController</code>. In this case only method 4 is called and <code>PreviewController</code> is deallocated before <code>UISplitViewController</code> can send message and call Method 2.</p> <p>How can I resolve this problem? Is there a way to force <code>UISplitViewController</code> to call it's delegate method? Or can I retain <code>PreviewController</code> in Method 4 and release it in Method 2 (using ARC)?</p> <pre><code>// Method 1 - (void)viewDidLoad { [super viewDidLoad]; self.hideMaster = YES; UISplitViewController *splitViewController = [(AppDelegate *)[[UIApplication sharedApplication] delegate] splitViewController]; splitViewController.delegate = self; } // Method 2 - (BOOL)splitViewController:(UISplitViewController *)svc shouldHideViewController:(UIViewController *)vc inOrientation:(UIInterfaceOrientation)orientation { return self.hideMaster; } // Method 3 - (void)viewWillAppear:(BOOL)animated { self.hideMaster = YES; UISplitViewController *splitViewController = [(AppDelegate *)[[UIApplication sharedApplication] delegate] splitViewController]; [splitViewController.view setNeedsLayout]; [splitViewController willRotateToInterfaceOrientation:self.interfaceOrientation duration:0]; } // Method 4 - (void)viewWillDisappear:(BOOL)animated { self.hideMaster = NO; UISplitViewController *splitViewController = [(AppDelegate *)[[UIApplication sharedApplication] delegate] splitViewController]; [splitViewController.view setNeedsLayout]; [splitViewController willRotateToInterfaceOrientation:self.interfaceOrientation duration:0]; } // PreviewController is created in UIViewController which belongs to UINavigationController PreviewController *previewVC = [[PreviewController alloc] initWithNibName:@"PreviewController" bundle:nil]; previewVC.documentURL = url; [self.navigationController pushViewController:previewVC animated:YES] </code></pre>
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    1. COWhere and how is your PreviewController instance created? Can you post code for that as well?
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    2. COAdded this information in question section.
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