How do I get the RootViewController from a pushed controller?

Question

So, I push a view controller from RootViewController like:

[self.navigationController pushViewController:anotherViewController animated:YES] ;

BUT, FRO

Answer 1

Swift version :

var rootViewController = self.navigationController?.viewControllers.first

ObjectiveC version :

UIViewController *rootViewController = [self.navigationController.viewControllers firstObject];

Where self is an instance of a UIViewController embedded in a UINavigationController.