在SceneDelegate SwiftUI

Question

我遵循了Onboarding屏幕的教程，但是似乎它主要是UIKit的改编，在AppDelegate上，我收到以下紫色错误：

Context in environment is not connected to a persistent store coordinator: <NSManagedObjectContext: 0x6000018d5880>

我相信这是在SceneDelegate中设置的方式，不将managedObjectContext传递到下一个屏幕，这是我的操作方式：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    // Use a UIHostingController as window root view controller.
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)

        // Set the MotherView as the root view
        window.rootViewController = UIHostingController(rootView: MotherView().environmentObject(ViewRouter()))
        self.window = window
        window.makeKeyAndVisible()
    }
}

如果我不使用核心数据，那行得通。如何在此处集成ViewRouter（）：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    // Get the managed object context from the shared persistent container.
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

    // Create the SwiftUI view and set the context as the value for the managedObjectContext environment keyPath.
    // Add `@Environment(\.managedObjectContext)` in the views that will need the context.
    let contentView = MotherView().environment(\.managedObjectContext, context)

    // Use a UIHostingController as window root view controller.
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)

        // Set the MotherView as the root view
        window.rootViewController = UIHostingController(rootView: contentView)
        self.window = window
        window.makeKeyAndVisible()
    }
}

我去了this帖子，但它对我没有帮助，有什么办法可以在SceneDelegate中解决此问题？

Answer 1

在任何地方将环境对象附加到构造的内容视图中，例如如下所示

let contentView = MotherView()
                     .environment(\.managedObjectContext, context)
                     .environmentObject(ViewRouter())