Change View on only one Tab in Tabbar-Application (Landscape-Portrait)?

Question

How can I change the view when rotating the iphone (change nib's). But it should only happens in one single tab! I tried it with:

    - (void)viewDidLoad {
 LandscapeViewController *viewController = [[LandscapeViewController alloc]
             initWithNibName:@"LandscapeView" bundle:nil];
 self.landscapeViewController = viewController;
 [viewController release];

 [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:)
             name:UIDeviceOrientationDidChangeNotification object:nil]; }

- (void)orientationChanged:(NSNotification *)notification
{
    [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0];
}

- (void)updateLandscapeView
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView)
 {
        [self presentModalViewController:self.landscapeViewController animated:YES];
        isShowingLandscapeView = YES;
    }
 else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView)
 {
        [self dismissModalViewControllerAnimated:YES];
        isShowingLandscapeView = NO;
    }    
}

But then the Landscape-View appears in all Tabs. (When this code is loaded once). Any idea?

Answer 1

What's happening is your view controller is receiving the UIDeviceOrientationDidChangeNotification notification whenever the rotation changes, whether or not it is being displayed. Instead try using the built-in methods of UIViewController that are meant for responding to rotations.

http://tinyurl.com/ycb8of2

Answer 2

This is from Apple's Docs (View Controller Programming Guide):

Tab Bar Controllers and View Rotation

Tab bar controllers support a portrait orientation by default and do not rotate to a landscape orientation unless all of the root view controllers support such an orientation. When a device orientation change occurs, the tab bar controller queries its array of view controllers. If any one of them does not support the orientation, the tab bar controller does not change its orientation.

So, I'm not sure that the Tab Bar Controller is designed to rotate just for a single view.

Answer 3

Tanks for your comments! I found a workaround:

//Remove Observer if not in Landscape
- (void)viewDidDisappear:(BOOL)animated {
    if (isShowingLandscapeView == NO) {
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
    }   
}

//Add Observer if not in Landscape
- (void)viewDidAppear:(BOOL)animated {
    if (isShowingLandscapeView == NO) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
    }
}