Launching into portrait-orientation from an iPhone 6 Plus home screen in landscape orientation results in wrong orientation

Question

The actual title for this question is longer than I can possibly fit:

Launching an app whose root view controller only supports portrait-orientation but which otherw

Answer 1

I had a very similar problem. I wanted to force portrait mode everywhere except for playing back videos.

What I did was:

1) to force the app orientation to be in portrait in the AppDelegate:

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if ([window.rootViewController.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]])
    {
        return UIInterfaceOrientationMaskAll;
    }
    return UIInterfaceOrientationMaskPortrait;
}

2) launching an empty modal view controller fixed the problem in my case. I launch it in the viewDidLoad of the first view controller that is on the root of my NavigationViewController (the first view controller visible after the application launches):

- (void)showAndHideNamelessViewControllerToFixOrientation {
    UIViewController* viewController = [[UIViewController alloc] init];
    [self presentViewController:viewController animated:NO completion:nil];
    [viewController dismissViewControllerAnimated:NO completion:nil];
}