How to use UINavigationController programmatically

1. Make ios project no storyboard setting.

Here is my link to set no storyboard.

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

var window: UIWindow?

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

// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.

// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.

// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

guard let windowScene = (scene as? UIWindowScene) else { return }

window = UIWindow(windowScene: windowScene)

let rootVC = ViewController()

let navVC = UINavigationController(rootViewController: rootVC)

window?.rootViewController = navVC

window?.makeKeyAndVisible()

}