Using AppDelegate in SwiftUI

App.swift

import SwiftUI

@main
struct Swift2TestApp: App {
  @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

  var body: some Scene {
    WindowGroup {
      ContentView()
    }
  }
}

class AppDelegate: NSObject, UIApplicationDelegate {
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    print("App launched")
    return true
  }
}