storyboardを使わずに書いたプロジェクトがビルドできない

Question

swiftでコードのみのUIを実装したのですが、ビルドの際に画面が真っ黒になってしまいます。
こちらの質問を参考にinfoのMainを消したり、Main Interfaceの項目も空欄にしましたが、ビルドしても画面が真っ黒になってしまいます。
どのように解決すればよろしいでしょうか？下のコードがAppDelegateとSceneDelegateのコードです。

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window:UIWindow?



    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.backgroundColor = .white
        window?.rootViewController = UINavigationController(rootViewController: TaskListViewController())
        window?.makeKeyAndVisible()

        
        return true
    }

    // MARK: UISceneSession Lifecycle
    @available(iOS 13.0, *)
    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }
    @available(iOS 13.0, *)
    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }


}

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 _ = (scene as? UIWindowScene) else { return }
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.backgroundColor = .white
        window?.rootViewController = UINavigationController(rootViewController: TaskListViewController())
        window?.makeKeyAndVisible()

    }
    
    @available(iOS 13.0, *)

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
    }
    @available(iOS 13.0, *)
    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }
    @available(iOS 13.0, *)
    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }
    @available(iOS 13.0, *)
    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }
    @available(iOS 13.0, *)
    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
    }


}

Comments

[hayabusabusash]

開発のターゲットにしている iOS のバージョンを教えていただけませんか？

[oeiqgfodgfhps]

13.5です！

[hayabusabusash]

ありがとうございます????‍♂️
iOS 13 以降ではデフォルトで SceneDelegate のイベントが採用されるので AppDelegate でルートの ViewController を設定する必要はありません。
AppDelegate で rootViewController を設定している箇所を消してからもう一度試してみていただけませんか？

[oeiqgfodgfhps]

ありがとうございます。
AppDelegateの該当箇所を消しましたが依然動作は変わらず、画面が真っ暗になって表示されます。

Answer 1

コードもあって長くなりそうなので回答に書かせていただきます。

UIWindow の生成の仕方が少し違う気がしたので、以下のようにして試してもらえませんか？

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 }
        let window = UIWindow(windowScene: windowScene)
        self.window = window
        window.rootViewController = UINavigationController(rootViewController: TaskListViewController())
        window.makeKeyAndVisible()
    }

Comments

[oeiqgfodgfhps]

上手くできました！ありがとうございます！