Невозможно добавить поддержку iOS для версий, предшествующих 13, в Xcode 11

Question

Я уже следовал этому руководству в обоих направлениях, путем реализации директив @available и удаления кода / файлов, но все равно отображается черный экран. Если я не пропустил что-то, я думаю, что сделал обе вещи правильно.

Это текущий статус удаления файлов / кода:

SceneDelegate.swift удалено.

AppDelegate.swift, как это:

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    return true
}



}

И, наконец, Info.plist, как это:

Что я отсутствует, поэтому экран по-прежнему отображается черным из-за того, что программа не поддерживает версии, предшествующие iOS 13?

Answer 1

Пошаговое руководство.

1. 1-й удалить SceneDelegate файл из проекта.
2. Добавить var window: UIWindow? to AppDelegate.

3. Удалить из AppDelegate ниже забавного c.

   // MARK: UISceneSession Lifecycle

   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)
   }
   
   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.
   }
   

4. Удалить Манифест сцены приложения ключ от Info.plist файл.

5. func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { let navigation = UINavigationController(rootViewController: ViewController()) let frame = UIScreen.main.bounds window = UIWindow(frame: frame) window!.rootViewController = navigation window!.makeKeyAndVisible() return true }

---

Extra

Добавить следующие методы делегирования в AppDelegate файл, ниже didFinishLaunchingWithOptions

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }

Answer 2

Добавьте этот код в файл AppDelegate в методе didFinishLaunchingWithOptions

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    if #available(iOS 13.0, *) {

    } else {
        let rootVC = //Initialize root controller
        self.window?.rootViewController = rootVC
        self.window?.makeKeyAndVisible()
    }
    return true
}