UINavigationBar appearance refresh?

Question

In my iPad app I have an application settings view. One of the options lets the user switch interface color scheme. The settings view is loaded by segue to a separate view

Answer 1

Objective-C:

self.navigationController.navigationBarHidden = YES;
self.navigationController.navigationBarHidden = NO;

Swift:

self.navigationController?.isNavigationBarHidden = true
self.navigationController?.isNavigationBarHidden = false