PageViewController

PageViewController is a UIViewController subclass in Apple's UIKit framework that manages a group of child view controllers and presents them in a page-by-page navigation interface. This allows users to swipe horizontally between different content screens, similar to how pages are turned in a book or magazine.

A PageViewController typically works by holding an array of child view controllers. When the user swipes, the PageViewController animates the transition between the current view controller and the next or previous one in the array. It provides mechanisms for data source and delegate protocols to manage the order of view controllers and handle navigation events.

Key features of PageViewController include its support for both horizontal and vertical paging. It can also be configured to display specific page indicators, such as dots, to show the user their current position within the sequence of pages. This makes it a common choice for implementing onboarding flows, image galleries, or any application where content is best viewed by swiping. The PageViewController itself does not display content; instead, it acts as a container and manager for other view controllers that contain the actual content.