How SwiftUI Actually Works — Deep Dive + React Native Parallels

Definition

SwiftUI is a declarative, value-type view framework built on top of UIKit/AppKit. You describe what the UI should look like for a given state, and the framework figures out the minimum set of imperative changes to get from the current UI to the desired UI.

Sources

• raw/Swift/2026-05-13-swiftui-deep-dive-how-it-works.md