iOS 7+ Dismiss Modal View Controller and Force Portrait Orientation

Question

I have a UINavigationController as the root view controller of my UIWindow on iOS 7 and iOS 8. From one of its view controllers, I present a fullscreen modal view controller wit

Answer 1

If the modal controller was in landscape orientation before dismissal, the presenting ViewController may not return to the origin orientation (portrait). The problem is because the AppDelegate supportedInterfaceOrientationsForWindow method is called before the controller is actually dismissed and the presented controller check still returns Landscape mask.

Set a flag to indicate whether the (modal) presented view controller will be displayed or not.

- (void)awakeFromNib // or where you instantiate your ViewController from
{
    [super awakeFromNib];
    self.presented = YES;
}

- (IBAction)exitAction:(id)sender // where you dismiss the modal
{
    self.presented = NO;
    [self dismissViewControllerAnimated:NO completion:nil];
}

And in the modal presented ViewController set the orientation according to the flag: When the modal ViewController is presented - return Landscape. When it is dismissed then return portrait

- (NSUInteger)supportedInterfaceOrientations
{
    if ([self isPresented]) {
        return UIInterfaceOrientationMaskLandscape;
    } else {
        return UIInterfaceOrientationMaskPortrait;
    }
}

Last step - from your AppDelegate call the modal presented ViewController for its orientation. I am just checking the currently presented ViewController and call the supportedInterfaceOrientations on it

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    NSUInteger orientationMask = UIInterfaceOrientationMaskPortrait;

    UIViewController *currentVC = self.window.rootViewController.presentedViewController; // gets the presented VC
    orientationMask = [currentVC supportedInterfaceOrientations];

    return orientationMask;
}

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