SwiftUI Scene Phases

.swift

import SwiftUI

@main
struct MyApp: App {
    
    @Environment(\.scenePhase) var scenePhase

    var body: some Scene {
        WindowGroup {
            ContentView()
            .onChange(of: scenePhase) { phase in
                switch phase {
                case .active:
                    print("Now the scene is Active")
                    // Active: The scene is in the foreground and interactive.
                case .inactive:
                    print("Now the scene is Inactive")
                    // Inactive: The scene is in the foreground and interactive.
                case .background:
                    print("Now the scene is in Background")
                    // Background: The scene isn’t currently visible in the UI.
                    // Perform cleanup when all scenes within
                    // MyApp go to the background.
                @unknown default:
                    break
                }
            }
        }
    }
}

struct ContentView: View {
    var body: some View {
        VStack {
            Image(systemName: "moon")
                .imageScale(.large)
                .foregroundColor(.red)
                .padding(.bottom)
            Text("Hello, Moon!")
                .font(.title)
        }
    }
}