iOS orientation change not working also UIDeviceOrientationDidChangeNotification not received - iphone

Question

I am quite new to iOS and I am trying desperately to get orientation changes working in my app. After researching here's what I do:
In my app I have a NavigationController managing seven UIViewController subclasses.
In the projects summary tab I activated all 4 device orientations.
Each UIViewcontroller subclass has a xib file, all xib files have "autoresize subviews" activated.
The UIViewController subclasses all have:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait ||
interfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
interfaceOrientation == UIInterfaceOrientationLandscapeRight );
}
they also all have:
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
and:
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
implemented with an NSLog(...) statements (never printed, debugger also never entering these methods).
Also I was trying to use:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
BOOL getOrientationUpdates = [[UIDevice currentDevice] isGeneratingDeviceOrientationNotifications];
NSLog(#"will receive orientation notifications: %#", getOrientationUpdates?#"YES":#"NO");
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
with
-(void)orientationChanged: (NSNotification*) notification
{
NSLog(#"orientationChanged");
}
and
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] removeObserver:self];
respectively.
when I do beginGeneratingDeviceOrientationNotifications etc. in the AppDelegate's - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
method, orientationChanged: is called once on startup but never again however I rotate the device, when I do it in one of the UIViewController subclasses it is never called!
So far, all I want to achieve is getting orientation notifications to rotate an UIImageView and UIImage (without any layout changes in the different orientations).
UIDeviceOrientation o = [UIDevice currentDevice].orientation;
always returns UIDeviceOrientationPortrait
It might be that I missed something in the docs or on stackoverflow, but I obviously cannot figure out what I need to do/add to get it working in my setup. also I am quite new to stackoverflow, so I hope my post is not violating any platform conventions.
Any help/hints are greatly appreciated. Thank you so much!
EDIT:
getOrientationUpdates is always YES, which appears strange to me as the notification callback selector is never called when I rotate it!
EDIT: in my AppDelegate's didFinishLaunchingWithOptions I am doing:
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.regScreenController = [[RegistrationScreenController alloc] initWithNibName:#"RegistrationScreenController" bundle:nil];
navCtrl = [[UINavigationController alloc]initWithRootViewController:self.regScreenController];
[navCtrl setNavigationBarHidden:YES];
self.window.rootViewController = self.regScreenController;
[self.window addSubview:navCtrl.view];
[self.window makeKeyAndVisible];
return YES;

Answer 1

See if you are setting the self.window.rootViewController in your AppDelegate's didFinishLaunchingWithOptions: method, because if you're adding only subviews to the window the orientation change notification does not fire.