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POUINavigationController 'corrupted navigation bar' issue
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copied!<p>I'm having serious problems getting my navigation controller to work and have tried pretty much every related question on this website.</p> <p>My problem is that when I perform a segue programmatically, there appears to be a transition in the navigation bar, but the view doesn't change. I see the following errors instead:</p> <pre><code>2013-10-22 13:47:30.059 App[2236:a0b] nested push animation can result in corrupted navigation bar 2013-10-22 13:47:30.411 App[2236:a0b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted. 2013-10-22 13:47:30.501 App[2236:a0b] Unbalanced calls to begin/end appearance transitions for </code></pre> <p>My storyboard looks like this:</p> <p><img src="https://i.stack.imgur.com/2lGxF.png" alt="enter image description here"></p> <p>In LoginViewController we perform a segue based on some condition:</p> <pre><code>- (void)viewDidAppear:(BOOL)animated { [super viewDidAppear]; NSString* appState = [AppConfig getAppState]; if ([appState isEqualToString:APP_STATE_WAITING]) { [self performSegueWithIdentifier:@"Load" sender:self]; } else if ([appState isEqualToString:APP_STATE_REGISTRATION_AVAILABLE]) { [self performSegueWithIdentifier:@"SignUp" sender:self]; } } </code></pre> <p>In LoadingViewController we wait for a response from a web service before doing:</p> <pre><code>- (void)segueToWaitingList:(NSUInteger)behind inFront:(NSUInteger)inFront { [MosaycOptions setAppState:APP_STATE_WAITING]; dispatch_async(dispatch_get_main_queue(), ^{ [self performSegueWithIdentifier:@"Waiting" sender:self]; }); } </code></pre> <p>And it is that segue that gives me the problem. The nav bar transitions but the view does not and we see the following errors printed out:</p> <pre><code>2013-10-22 13:47:30.059 App[2236:a0b] nested push animation can result in corrupted navigation bar 2013-10-22 13:47:30.411 App[2236:a0b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted. 2013-10-22 13:47:30.501 App[2236:a0b] Unbalanced calls to begin/end appearance transitions for </code></pre> <p>The app doesn't crash, but no segue occurs, it doesn't transition to the waiting list view but simply stays on Loading and prints the error to console. When I press back rather than moving back to the login screen I get the following blank screen:</p> <p><img src="https://i.stack.imgur.com/p919R.png" alt="enter image description here"></p> <p>If I press back again it crashes with this error: <a href="http://pastebin.com/7mCyeQv9" rel="nofollow noreferrer">http://pastebin.com/7mCyeQv9</a></p> <p>Something is clearly getting messed up with the navigation stack, however i've inspected it using the debugger and it looks absolutely fine, everything gets pushed as normal. I can't for the life of me figure it out. This is just a standard navigation controller setup that i've used before.</p> <p>Any ideas?</p>

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