Connecting UIKit with SwiftUI, why did I lose my NavBar? - swift

Question

So when I use the old UIKit Lifecycle with SceneDelegate and AppDelegate I get the desired result. But when I use the new App life cycle I can't figure out to get the NavBar back..
import SwiftUI
struct ContentView: View {
var body: some View {
DiffableContainer()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
DiffableContainer()
.ignoresSafeArea()
}
}
struct DiffableContainer: UIViewControllerRepresentable {
func makeUIViewController(context: Context) -> UIViewController {
return UINavigationController(rootViewController: DiffableTableVC())
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
}
}
class DiffableTableVC: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.backgroundColor = .green
navigationItem.title = "Test"
title = "Hello"
}
}
class AppDelegate: NSObject, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
print("This is set up and running")
return true
}
}
Here is the lifecycle that I am using now:
#main
struct ContactsApp: App {
#UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
var body: some Scene {
WindowGroup {
ContentView()
}
}
}