viewControllerBeforeViewController
The viewControllerBeforeViewController method is a crucial component within Apple's UIKit framework, specifically used in managing the presentation and dismissal of view controllers. It is a method of the UIPageViewController class, a specialized view controller that manages a collection of child view controllers that the user can flip between.
This method is invoked by the page view controller when it needs to determine which view controller
Implementing viewControllerBeforeViewController is essential when you are using a UIPageViewController to present content in a paginated
If your implementation returns nil, it signifies that there is no preceding view controller, effectively indicating