SwiftUI iPad 应用在启用多个 window 支持时显示黑屏

SwiftUI iPad app shows black screen on enabling multiple window support

在 macOS Catalina 上使用 SwiftUI,当启用 "Support multiple windows" 时,我的 iPad 应用程序在模拟器中启动时显示黑屏

我正在使用常用的 SwiftUI 项目,唯一的变化是单击 "Support multiple windows" 复选框

这来自我的 SceneDelegate,我认为这是在 SwiftUI

中设置 window 的正确方法
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    let window = UIWindow(frame: UIScreen.main.bounds)
    window.rootViewController = UIHostingController(rootView: ContentView())
    self.window = window
    window.makeKeyAndVisible()
}

在我的 Info.plist 我相信我拥有我需要的一切

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

window必须初始化为

let window = UIWindow(windowScene: scene as! UIWindowScene)