SwiftUI 回到sceneWillEnterForeground SceneDelegate.swift 中的RootView

Question

如果 App 进入前台，我们会尝试将当前 View 重置为 Root。

我们如何在 SwiftUI 中做到这一点？

func sceneWillEnterForeground(_ scene: UIScene) {
      let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
    let contentView = RootView().environment(\.managedObjectContext, context)
    if let windowScene = scene as? UIWindowScene {
        let singleOrder = SingleOrder()
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = UIHostingController(rootView: contentView.environmentObject(singleOrder))
        self.window = window
        window.makeKeyAndVisible()
    }
}

Answer 1

没有“返回”，但可能的方法是重新创建根视图控制器，通过将“默认”生成的内容创建移动到其他委托方法中，如下所示...

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        self.window = window
    }
}


func sceneWillEnterForeground(_ scene: UIScene) {
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
    let contentView = RootView().environment(\.managedObjectContext, context)
    let singleOrder = SingleOrder()
    window?.rootViewController = UIHostingController(rootView: contentView.environmentObject(singleOrder))
    window?.makeKeyAndVisible()
}