Please see the custom navigation bar example here: https://github.com/xamarin/ios-samples/tree/main/NavigationBar/NavigationBar
Specifically: CustomBackButtonNavController.cs and CustomBackButtonViewController.
In the notes of CustomBackButtonNavController.cs they say, "UINavigationController subclass used for targeting appearance proxy changes in the Custom Back Button example."
Yet that class is NEVER utilized other than line 28 in CustomBackButtonViewController. And in the way it is used I don't see how CustomBackButtonNavController is ever instantiated to accurately differentiate as an instance to target.
Can someone please explain why they set up the custom back button in this way and how the appearance proxy is intended to work in this example?