Navigation Controller Basics

So what exactly is a navigation controller? Well, the textbook definition is that it manages a hierarchy of views as the user moves through an app. However, it’s much easier to comprehend visually, and you can see how navigation controllers work in the following image:
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The Settings app is a prime example of what navigation controllers look like and how they work.
The bar above the view is known as the “navigation bar”. The navigation bar displays the current view’s title, as well as a back button that returns you to the previous view.

UINavigationController

In code, the navigation controller is represented using ...

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