AppDelegate for iOS 13 with multiple windows supports

AppDelegate.swift

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Set up application here

        if #available(iOS 13, *) {

        } else {
            window = UIWindow(frame: UIScreen.main.bounds)
            window?.rootViewController = ViewController() 
            window?.makeKeyAndVisible()
        }

        return true
    }

}

@available(iOS 13.0, *)
extension AppDelegate {

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {

    }

}

Info.plist

<key>UIApplicationSceneManifest</key>
	<dict>
		<key>UISceneConfigurations</key>
		<dict>
			<key>UIWindowSceneSessionRoleApplication</key>
			<array>
				<dict>
					<key>UISceneDelegateClassName</key>
					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
					<key>UISceneConfigurationName</key>
					<string>Default Configuration</string>
					<key>UISceneStoryboardFile</key>
					<string>Main</string>
				</dict>
			</array>
		</dict>
		<key>UIApplicationSupportsMultipleScenes</key>
		<true/>
	</dict>

SceneDelegate.swift

import UIKit

@available(iOS 13.0, *)
final class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let userActivity = connectionOptions.userActivities.first ?? session.stateRestorationActivity {
            configure(window: window, with: userActivity)
        }

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


        window = UIWindow(windowScene: windowScene)
        window?.makeKeyAndVisible()
        Coordinator.main.present(scene: .main(message: nil, window: window!), from: nil, completion: {
            guard let url = connectionOptions.urlContexts.first?.url else {
                return
            }
            
            // …
        })
    }

    func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? {
        return scene.userActivity
    }
    
}

@available(iOS 13.0, *)
extension SceneDelegate {

    func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
        guard let url = URLContexts.first?.url else {
            return
        }
        _ = Coordinator.main.handleUrl(UIApplication.shared, open: url)
    }
    
}

@available(iOS 13.0, *)
extension SceneDelegate {

    private func configure(window: UIWindow?, with userActivity: NSUserActivity) {

    }

}