AppDelegate should call the method if the screen orientation has changed - ios

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. :)