AppDelegate should call the method if the screen orientation has changed

Question

I have a popover, which I present from the TabBarItem thats why I make it in AppDelegate, but I need to reshow popover in new place if the screen orientation has changed. In other places of my app I just use the didRotateFromInterfaceOrientation method, but it doesn't called in AppDelegate. How can I solve this?

I present a popover by this code:

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        if (viewController == [self.objTabBarController.viewControllers objectAtIndex:2])
        {
            if (self.settingsPopover == nil) {
                UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main - iPad" bundle: nil];
                SettingsViewController *settingsController = [mainStoryboard instantiateViewControllerWithIdentifier: @"SettingsPopover"];

                UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:settingsController];

                self.settingsPopover = [[UIPopoverController alloc] initWithContentViewController:navigationController];

                CGSize tabBarSize = self.objTabBarController.tabBar.frame.size;
                CGPoint center = [self.window.rootViewController.view convertPoint:self.objTabBarController.tabBar.center fromView:self.objTabBarController.tabBar.superview];
                center.x += 105;
                center.y -= tabBarSize.height / 2;
                CGRect rect = {center, CGSizeZero};

                [self.settingsPopover presentPopoverFromRect:rect inView:self.window.rootViewController.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
            } else {
                [self.settingsPopover dismissPopoverAnimated:NO];
                self.settingsPopover = nil;
            }

            return NO;
        }
    }
    return YES;
}

Answer 1

You can register a Notification as follow:

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

Then, implement it in the AppDelegate:

- (void)handleDidChangeStatusBarOrientationNotification:(NSNotification *)notification;
{
  NSLog(@"The orientation changed to %@", [notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey]);
}

Enjoy. :)