ios – Adapting SwiftUI like flow in UIKit/Storyboard based app

I have the following flow in a sample SwiftUI example which is very handy. It basically checks for a flag in UserDefaults whether an intro view has been shown before or not, and based on it loads the ContentView or IntroView. Once IntroView has been shown and the user taps the IntroView, it automatically switches back to ContentView. This is really a good feature in SwiftUI where the App struct observes the bool and recomputes WindowGroup.

Problem: I have an existing UIKit based app based on Storyboard and I am slowly injecting SwiftUI views into it using UIHostingController. But I don’t really get SwiftUI app lifecycle benefits like above in it and it becomes cumbersome. For instance, after showing IntroView, I might need to show another view such as PermissionsView where I ask for camera and photo library permissions which the user can alter anytime in iOS Settings. In SwiftUI, the code such as below automatically watches any changes and pops the IntroView or PermissionsView. How do I do this in my UIKit based app? Is it possible to migrate the UIApplicationDelegate & SceneDelegate code to SwiftUI App while still having view controllers load from Storyboard?

@main
struct TestSwiftUIIntroViewsApp: App {

   @AppStorage("showedIntroView") var showedIntroView: Bool = false

   var body: some Scene {
      WindowGroup {
         if showedIntroView {
             ContentView()
         } else {
             IntroView()
         }
     }
   }
 }

struct ContentView: View {
   var body: some View {
       VStack {
           Text("Content View")
       }
       .padding()
   }
 }

struct IntroView: View {

    @AppStorage("showedIntroView") var showedIntroView: Bool = false

    var body: some View {
      VStack(alignment: .center, content: {
         Text("Intro View")
      })
     .onTapGesture {
        showedIntroView = true
      }
    }

}