The App File

An app starts at a struct marked @main that conforms to App. Its body holds a WindowGroup, and the view inside it is the first screen the user sees:

@main
struct CoddyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

This is the file Xcode creates for every new app. In these lessons it lives in CoddyApp.swift, which is locked, and you write your screens in ContentView.swift.

A view can carry an accessibility identifier: a name that tests use to find it. It does not change how the view looks:

Text("Good morning")
    .accessibilityIdentifier("greeting")

.accessibilityIdentifier("greeting") is a modifier: a method you call on a view to get a changed view back. Apple's UI tests find views the same way, and the checks in these lessons do too, so when a task gives an identifier, attach it exactly as written.