AppState_in_AppDelegate_SwiftUI_LifeCycle.md

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Q: Accessing AppState in AppDelegate with SwiftUI's new iOS 14 life cycle (by Mister22)

A: A possible approach is to use shared instance for AppState. As by intention is app-wide state, so it is the one, so it can be used static shared instance (it can be done even complete sigleton by making init private). So as it is done as shared then it is available anywhere in app, like NSApp or UIApplication.shared.

class AppState: ObservableObject {
    static let shared = AppState()    // << here !!

    // Singe source of truth...
    @Published var user = User()
}

so you can use it everywhere

struct MyApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    @StateObject var appState = AppState.shared

    // ... other code
}

and

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        // ...and access appState here

        AppState.shared.user = ...
    }