UINavigationController supportedInterfaceOrientations: category vs swizzle

Question

I'm using a tabBarController with multiple UINavigationControllers in my iPhone app, and now I want to add support for rotation (on some view controllers, not all). I know I need to implement the supportedInterfaceOrientation method for my UIViewControllers.

When the device is rotated, the supportedInterfaceOrientation is called on the UINavigationController, but I need it be called on my viewControllers. What's the best way to do this?

• I've seen some people create a category on UINavigationController that overrides supportedInterfaceOrientation to query the child viewControllers. But I know that Apple frowns upon using Categories to override methods. (I've implemented it like this, and it works fine, but I want to ensure the app continues to work with future version of iOS.)

• What about using method swizzling?

• Subclass UINavigationController?

Any suggestions appreciated. :)

Answer 1

If you use iOS 6+ I would suggest subclassing UINavigationController and overriding supportedInterfaceOrientations

Something similar to:

- (NSUInteger)supportedInterfaceOrientations;
{
  return [self.topViewController supportedInterfaceOrientations];
}

Answer 2

You do not need subclass anything. Just add notification observer in every class that should react to orientation changes

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(screenOrientationChanged) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];