Rather than have a single root navigation controller than contains our WMFAppViewController (UITabBarController subclass), we should instead embed 5 navigation controllers as the root view of each tab. This setup feels more standard for iOS apps. See Apple documentation on UITabBarController:
You can use navigation controllers or custom view controllers as the root view controller for a tab. If the root view controller is a navigation controller, the tab bar controller makes further adjustments to the size of the displayed navigation content so that it doesn’t overlap the tab bar.
There should be no user-visible changes to the app.
Notes for QA
- Regression testing of app launch is needed.
- Regression testing of deep linking (for example, to an article) is needed.
- Regression testing of article state restoration is needed (go to an article, background, then terminate. Confirm upon app launch the article is restored).