Application life cycle

LifeCycleApp-Example1.swift

@main
struct YourApp: App {

    var body: some Scene {
        let publisherBackground = NotificationCenter.default.publisher(for: UIApplication.willResignActiveNotification)
        let publisherForeground = NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)

        return WindowGroup {
            RootView()
                .onReceive(publisherBackground) { _ in
                    print("Moving to the background!")
                }
                .onReceive(publisherForeground) { _ in
                    print("Moving back to the foreground!")
                }
        }
    }
}

LifeCycleApp-Example2.swift

@main
struct YourApp: App {

    @Environment(\.scenePhase) var scenePhase

    var body: some Scene {
        WindowGroup {
            RootView().onChange(of: scenePhase) {
                switch $0 {
                case .background:
                    print("Moving to the background!")
                    
                case .active:
                    print("Moving back to the foreground!")
                    
                case .inactive:
                    print("App inactive!")
                    
                @unknown default:
                    break
                }
            }
        }
    }
}