Coordinator design pattern

Coordinator.swift

import Foundation
import UIKit

protocol Coordinator {
    var parentCoordinator: Coordinator? { get set }
    var children: [Coordinator] { get set }
    var navigationController: UINavigationController { get set }
    
    func start()
}

class AppCoordinator: Coordinator {
    var parentCoordinator: Coordinator?
    
    var children: [Coordinator] = []
    
    var navigationController: UINavigationController
    
    init(navController: UINavigationController) {
        self.navigationController = navController
    }
    
    func start() {
        print("Running App Coordinator")
    }
    
    
}

for using, go to AppDelegate and add:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let navigationController = UINavigationController()
    appCoordinator = AppCoordinator(navController: navigationController)
    appCoordinator?.start()
    window?.rootViewController = navigationController
    window?.makeKeyAndVisible()
    return true
}

Source:

https://medium.com/nerd-for-tech/mvvm-coordinators-ios-architecture-tutorial-fb27eaa36470