What's New / App UI: SwiftUI, AppKit & UIKit
AppKit adds 318 APIs (message-based NSApplication notifications, NSTextViewportRenderingSurface) and SwiftUI adds 139 (document readers, navigation transitions), plus PaperKit's Markup model and UIKit bar-minimize behaviors.
AppKit is the macOS UI framework.
SwiftUI is Apple's declarative UI framework for building interfaces across iOS, macOS, and the other Apple platforms.
UIKit is Apple's framework for building app user interfaces.
PaperKit models document markup elements through a common Markup protocol, covering shapes, images, links, and loupes.
PencilKit captures Apple Pencil and touch input into strokes and renders them in a canvas view.
WebKit is Apple's web rendering engine, exposed through WKWebView and its delegate protocols for loading, navigating, and scripting web content.
SwiftUICore holds foundation types of SwiftUI's declarative UI layer, including view-building and gesture primitives like ViewBuilder and TapGesture.
_WebKit_SwiftUI is a Swift cross-import overlay, not a standalone framework.
Charts is Apple's framework for building data visualizations in SwiftUI.
WatchKit is Apple's framework for building watchOS apps.
DeveloperToolsSupport provides the runtime types that back Xcode developer tooling, letting code declare what tools such as Xcode Previews render…