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How to find out orientation changed in AppDelegate

A function of how the device knows the orientation change is - (void) viewWillLayoutSubviews and - (void) viewDidLayoutSubviews But they're just in controllers; Now I want to know if there are any functions like these to find out the orientation change in the AppDelegate.m file

- (void)navigationController:(UINavigationController *)navigationController
      willShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animated {

    UINavigationBar *morenavbar = navigationController.navigationBar;
    UINavigationItem *morenavitem = morenavbar.topItem;
    //We don't need Edit button in More screen.
    morenavitem.rightBarButtonItem = nil;
    morenavitem.title = nil;
    UIImage *backgroundImage = [UIImage imageNamed:@"nav.png"];

    [morenavbar setBackgroundImage:backgroundImage 
         forBarMetrics:UIBarMetricsDefault];

    UIDeviceOrientation currentDeviceOrientation = 
           [[UIDevice currentDevice] orientation];
    UIInterfaceOrientation currentInterfaceOrientation = 
           [[UIApplication sharedApplication] statusBarOrientation];
    if (UIDeviceOrientationIsLandscape(currentDeviceOrientation)||
        UIDeviceOrientationIsLandscape(currentInterfaceOrientation)){
        UIImage *backgroundImageLandscape = [UIImage imageNamed:@"navbar_landscape.png"];
        [morenavbar setBackgroundImage:backgroundImageLandscape forBarMetrics:UIBarMetricsDefault];
    }

}
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2 answers


You can register for rotation notifications.

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(handleDidChangeStatusBarOrientationNotification:) 
                                             name:UIApplicationDidChangeStatusBarOrientationNotification 
                                           object:nil];

Then we implement the method called when the message is sent



- (void)handleDidChangeStatusBarOrientationNotification:(NSNotification *)notification;
{
  // Do something interesting
  NSLog(@"The orientation is %@", [notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey]);
}

Alternatively check the docs for UIApplicationDidChangeStatusBarOrientationNotification which will give you

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If you are talking about the orientation of the interface, you can observe UIApplicationDidChangeStatusBarOrientationNotification

, and if you want to be notified when the orientation of the device has changed, you can observeUIDeviceOrientationDidChangeNotification



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