在Xcode 12.1中将部署目标设置为11.0时，为什么我的应用程序变暗？

如何解决在Xcode 12.1中将部署目标设置为11.0时，为什么我的应用程序变暗？

我正在使用最新的Xcode（12.1）创建一个新项目。创建新项目时的默认部署目标是14.1。然后我将其更改为11.0。因为我想定位iOS 11.0及更高版本的用户

然后它将在我的AppDelegate和SceneDelegate

中创建很多这样的警告

我修复了所有这些问题，因此我的AppDelegate和SceneDelegate类似于下面的代码。

问题是.....

当我在真实设备iOS 14.1上运行它时，它将没有任何问题。但是当我在iOS 12.4.8上运行它时，我的应用程序将完全变黑

我还已经使用此键在info.plist中关闭了暗模式

<key>Appearance</key>
<string>Light</string>

如何解决这个问题？

像iOS 12.4.8一样完全黑暗。背景颜色应为自定义橙色

SceneDelagate.swift

class SceneDelegate: UIResponder,UIWindowSceneDelegate {

    var window: UIWindow?


    @available(iOS 13.0,*)
    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 }
    }

    @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 necessarily 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.
    }


}

AppDelegate.swift

@main
class AppDelegate: UIResponder,UIApplicationDelegate {



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

解决方法

我从here那里得到答案

您必须在AppDelegate类中添加以下属性声明

var window: UIWindow?