A template for an application based on SwiftUI

MyApp.swift

import SwiftUI
import os.log

@main
struct MyApp: App {
    private let logger = Logger(subsystem: "bundleId", category: "classname")
    
    @Environment(\.scenePhase) private var scenePhase
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .onChange(of: scenePhase) { (newScenePhase) in
            switch newScenePhase {
            case .active:
                logger.debug("Scene entered active phase")
            case .inactive:
                logger.debug("Scene entered inactive phase")
            case .background:
                logger.debug("Scene entered background phase")
            @unknown default:
                logger.debug("Scene entered an undetermined phase")
            }
        }
    }
}