AppKit

AppKit is Apple's framework for building the user interface of macOS apps, including windows, menus and buttons.

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AppKit is a core framework of Cocoa, Apple's environment for developing macOS apps, and traces its roots to NeXT's NeXTSTEP operating system. It handles on-screen elements such as windows, menus, buttons and text input, along with keyboard and mouse events.

Developers use it with Swift or Objective-C to build native macOS apps, while UIKit plays the same role for iPhone and iPad apps.

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