[Previous description deleted]
Let’s try again. I am using Xcode’s Visual Storyboard. I’m using a Navigation Controller Scene, which is linked to a View Controller Scene, which is then linked to 3 separate View Controller Scenes via buttons.
When I highlight the first View Controller Scene and enable the Assistant Editor, I am able to make changes to ViewController.h or .m in the adjacent window.
Heart of the Problem:
When I select any one of the 3 separate View Controller Scenes, my Assistant Editor shows “@interface UIViewController.h” when I was expecting ViewController.h or .m . What’s more, I can’t make any changes as an error pops up “This content is locked for editing”.
Be gentle, I’m new. I’m sure I’m just missing something small.
Solved, thanks to Douglas in the comments
In each of your 3 view controllers, have you changed their class? Each one needs a specific .h and .m file. If you don’t define one, you can’t change or edit anything. Let us know how it works out!