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 only want my app to open in landscape mode (and not exhibit the problem you describe above on the iPhone 6 Plus), so I set Landscape (left home button) and Landscape (right home button) as the only orientations allowed in my app's PLIST file. This fixes the orientation problem when my app opens. However, I need my app to support portrait mode for one view only since I display a UIImagePickerController in my app, which Apple requires to be shown in portrait mode on iPhone.

I was able to support portrait for that one view only, while keeping my app opening in landscape mode, by including the following code in AppDelegate:

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {

        return UIInterfaceOrientationMaskAllButUpsideDown;

    } else {

        return UIInterfaceOrientationMaskAll;

    }

}