Unbalanced calls to begin/end appearance transitions

Question

I'm currently pulling my hair out solving this bug :/ I have already tried the solutions from other SO threads regarding this topic but had no luck so far.

Here's what's wrong: I have a UINavigationController that pushes View A, from View A I can press a button to push View B - works fine. But when I push View B, then rotate the screen into landscape mode and then click the back button, I get the following output in the console and the view switching is not animated, just switches from B back to A:

2012-01-02 20:50:42.866 [13345:f803] Unbalanced calls to begin/end appearance transitions for <DimensionConversionViewController: 0x68831f0>.
2012-01-02 20:50:42.868 [13345:f803] attempt to dismiss modal view controller whose view does not currently appear. self = <UINavigationController: 0x6b541a0> modalViewController = <UISnapshotModalViewController: 0x6da5190>

This is how I push the View B into the stack:

- (void) showConverter:(id)sender {
    [self.navigationController pushViewController:converter animated:YES];
}

-viewDidLoad of View B:

- (void) viewDidLoad {
        [super viewDidLoad];
        // Do any additional setup after loading the view from its nib.
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateInterface) name:@"UIDeviceOrientationDidChangeNotification" object:nil];
        // ... Update text fields ...
        [self updateInterface];
 }

-viewDidUnload of View B:

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIDeviceOrientationDidChangeNotification" object:nil];
}

If you have questions or need more code samples, please let me know.

Thanks in advance for any help :-)

Answer 1

Turned out that in my case the root cause of the problem was, that I forgot to update all the shouldAutorotateToInterfaceOrientation: methods in the different view controllers to return YES for all UIInterfaceOrientations (or let's say they should all return the sam). Doing this solved the issue.