MainCoordinatorOne.swift

import UIKit

class MainCoordinator: ApplicationCoordinator {
    
    var window: UIWindow
    var appCoordinator: Coordinator!
    
    init(window: UIWindow?) {
        guard let window = window else { fatalError("Invalid, no window") }
        self.window = window
    }
    
    func setup(coordinator: Coordinator) {
        appCoordinator = coordinator
        appCoordinator.delegate = self
    }
    
    func start() {
        guard let coordinator = appCoordinator else { return }
        coordinator.start()
        window.makeKeyAndVisible()
    }
}