UINavigationController in swiftUI.

HasRootNavigationController.swift

import SwiftUI
import UIKit

protocol HasRootNavigationController {
    var rootVC:UINavigationController? { get }
    
    func push<Content:View>(view: Content, animated:Bool)
    func setRootNavigation<Content:View>(views:[Content], animated:Bool)
    func pop(animated: Bool)
    func popToRoot(animated: Bool)
}

extension HasRootNavigationController where Self:View {
    
    var rootVC:UINavigationController? {
        guard let scene = UIApplication.shared.connectedScenes.first,
            let sceneDelegate = scene as? UIWindowScene,
            let rootvc = sceneDelegate.windows.first?.rootViewController
                as? UINavigationController else { return nil }
        return rootvc
    }
    
    func push<Content:View>(view: Content, animated:Bool = true) {
        rootVC?.pushViewController(UIHostingController(rootView: view), animated: animated)
    }
    
    func setRootNavigation<Content:View>(views: [Content], animated:Bool = true) {
        let controllers =  views.compactMap { UIHostingController(rootView: $0) }
        rootVC?.setViewControllers(controllers, animated: animated)
    }
    
    func pop(animated:Bool = true) {
        rootVC?.popViewController(animated: animated)
    }
    
    func popToRoot(animated: Bool = true) {
        rootVC?.popToRootViewController(animated: animated)
    }
}

SceneDelegate.swift

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        UINavigationBar.appearance().tintColor = .black
        
        let contentView = OnBoardingView()
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            let hostingVC = UIHostingController(rootView: contentView)
            let mainNavVC = UINavigationController(rootViewController: hostingVC)
            mainNavVC.navigationBar.isHidden = true
            window.rootViewController = mainNavVC
            self.window = window
            window.makeKeyAndVisible()
        }
    }
}

YouSwiftUIView.swift

extension YouSwiftUIView:HasRootNavigationController {
    
    func switchToMainScreen() {
        self.setRootNavigation(views: [MainView()])
    }
    
    func pushToMainScreen() {
         self.push(view: [MainView()])
    }

    func goBack() {
         self.pop()
    }
  
    func showTheInitialView() {
         self.popToRoot()
    }
}