Quick example of Module Provider

ModuleProvider.swift

import ModuleProvider
import UIKit
import Foundation 

enum Module {
  case none
  case messages(YourConfigObject)
  case feed
  case profile
}

class ModuleProvider {
  let shared = ModuleProvider()
  private let rootNavigationController: UINavigationController
  private let rootViewController: UIViewController
  private var activeModule: Module = .none

  var root: UIViewController {
    self.rootViewController
  }

  private init() {
    self.rootViewController = HomeScreenViewController()
    self.rootNavigationController = UINavigationController(rootViewController: self.rootViewController)
    NotificationCenter.default.publisher(for: .init(rawValue: "moduleChanged")).sink { [weak self] (notification) in 
      guard let userData = notification.userInfo as? [String: Any], let newActiveModule = userData["val"] as? ActiveModule else { return }
        self?.activeModule = newActiveModule
        self?.updateHierarchy()
    }
  }
  
  func updateHierarchy() {
    switch activeModule {
      case messages(let settings): 
        let vc = MessagesViewController()
        controller.yourCustomSettings = settings
        self.rootNavigationController.popToRootViewController(animated: true)
        self.rootViewController.push(vc)
      case .none: 
        self.rootNavigationController.popToRootViewController(animated: true)
      default: print("add code to launch this module...")
    }
  }
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        let rootViewController = ModuleProvider.shared.root()

        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = rootViewController
            self.window = window
            window.makeKeyAndVisible()
        }
    }
  ...
}