Syntax of a SwiftUI app

swift-ui-syntax.md

Syntax of a SwiftUI app

The structure of a SwiftUI app uses a lot of Swift syntax to appear simple:

import SwiftUI


@main                         // <-- Attribute (potentially an attached macro)
struct MyApp: App {
    var body: some Scene {    // <-- computed property with implicit get only (using an opaque type satisfying the Scene protocol)
        WindowGroup {         // <-- getter implicitly returning WindowGroup instance with a constructor receiving a closure
            ContentView()     // <-- closure implicitly returning this
        }
    }
}