Question

I have an app which starts with a root UINavigationController. This controller then pushes and pops various other UIViewControllers – that all works fine.

My app has a custom graphic for the navigationController.navigationBar.backgroundImage. There is one image for the iPhone platform. There are two images for the iPad platform – one for portrait, one for landscape. The iPad is the platform of issue as it rotates, the iPhone platform is portrait only.

I had already written code in -(void)willRotateToInterfaceOrientation: to detect the rotation, and set the navigationBar.backgroundImage to the correct orientation graphic, if the platform is iPad.

In the iPad 5.0 simulator – it works fine; rotating the iPad on screen results in the correct navigationBar graphic regardless of orientation.

On the device – it doesn’t work – The graphic appears correctly on iPad device launch in portrait. When I rotate to landscape, the navigationBar changes to a standard grey one. When I rotate back the grey ‘sticks’.

I have tried calling setNeedsDisplay – no change.

I have tried setting navigationBar.tintColor = [UIColor clearColor] – no change.

I have checked the filenames of the graphics in the code are identical to the actual filenames – they are.

Code for rotation:

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
    return YES; }
return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        UIImage *titleImage = [UIImage imageNamed:@"StandardHeaderIpadLandscape"];
        self.navigationController.navigationBar.tintColor = [UIColor clearColor];
        [self.navigationController.navigationBar setBackgroundImage:titleImage forBarMetrics:UIBarMetricsDefault];
        self.navigationController.view.backgroundColor = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"StandardBackgroundiPadLandscape.png"]];
        [self.navigationController.navigationBar setNeedsDisplay];
    } else {
        UIImage *titleImage = [UIImage imageNamed:@"StandardHeaderIpadPortrait"];
         self.navigationController.navigationBar.tintColor = [UIColor clearColor];
        [self.navigationController.navigationBar setBackgroundImage:titleImage forBarMetrics:UIBarMetricsDefault];
        self.navigationController.view.backgroundColor = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"StandardBackgroundiPad.png"]];
        [self.navigationController.navigationBar setNeedsDisplay];
    }
}

}

Answer 1

Check whether titleImage is nil. I have a feeling that your image paths are not correct, or those images are not correctly copied to iPad.