What is the difference between AppKit and UIKit?

Question

UIKit and AppKit still share a lot of concepts. Like in "AppKit contains all the objects you need to implement the user interface for a macOS app—windows, panels, buttons, menus, scrollers, and text fields" (by Apple documentation). And same UIKit is support the user interface. So what's the main difference between these two framework.

Answer 1

AppKit AppKit is included in the OS X SDK only. It provides all the classes and controls you need for creating Mac applications. Most of these classes share a common naming prefix starts with NS and classes you will be working with include - NSView, NSButton.

UIKit

UiKit is the framework that iOS uses to provide its UI and its classes start with a UI prefix. For example, both frameworks have a class to represent color include UIColor, while other concepts are pretty unique to UIKit, such as its use of predefined controllers such as UINavigationController and UITabBarController