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

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I had the same issue when launching our app in landscape on an iPhone 6 Plus.

Our fix was to remove landscape supported interface orientations from the plist via project settings:

Removed landscape orientation

and implement application:supportedInterfaceOrientationsForWindow: in the app delegate:

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

Apparently the information in your plist is to specify what orientations your app is allowed to launch to.

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