swift - CoreData 和 SwiftUI : Context in environment is not connected to a persistent store coordinator

Question

我正在尝试通过构建一个作业管理应用程序来自学核心数据。我的代码构建良好，应用程序运行正常，直到我尝试将新分配添加到列表中。我收到此错误 Thread 1: EXC_BREAKPOINT (code=1, subcode=0x1c25719e8)在以下行:ForEach(courses, id: \.self) { course in 。控制台也有这个错误:Context in environment is not connected to a persistent store coordinator: <NSManagedObjectContext: 0x2823cb3a0> .

我对核心数据知之甚少，并且不知道问题可能是什么。我在数据模型中设置了“作业”和“类(class)”实体，其中类(class)与作业具有一对多关系。每项作业都将分类在特定类(class)下。

这是向列表添加新分配的 View 的代码:

    struct NewAssignmentView: View {

    @Environment(\.presentationMode) var presentationMode
    @Environment(\.managedObjectContext) var moc
    @FetchRequest(entity: Course.entity(), sortDescriptors: []) var courses: FetchedResults<Course>

    @State var name = ""
    @State var hasDueDate = false
    @State var dueDate = Date()
    @State var course = Course()

    var body: some View {
        NavigationView {
            Form {
                TextField("Assignment Name", text: $name)
                Section {
                    Picker("Course", selection: $course) {
                        ForEach(courses, id: \.self) { course in
                            Text("\(course.name ?? "")").foregroundColor(course.color)
                        }
                    }
                }
                Section {
                    Toggle(isOn: $hasDueDate.animation()) {
                        Text("Due Date")
                    }
                    if hasDueDate {
                        DatePicker(selection: $dueDate, displayedComponents: .date, label: { Text("Set Date:") })
                    }
                }
            }
            .navigationBarTitle("New Assignment", displayMode: .inline)
            .navigationBarItems(leading: Button(action: {
                self.presentationMode.wrappedValue.dismiss()
            }, label: { Text("Cancel") }),
                                trailing: Button(action: {
                                    let newAssignment = Assignment(context: self.moc)
                                    newAssignment.name = self.name
                                    newAssignment.hasDueDate = self.hasDueDate
                                    newAssignment.dueDate = self.dueDate
                                    newAssignment.statusString = Status.incomplete.rawValue
                                    newAssignment.course = self.course
                                    self.presentationMode.wrappedValue.dismiss()
                                }, label: { Text("Add").bold() }))
        }
    }
}

编辑:这是 AppDelegate 中设置持久容器的代码:

lazy var persistentContainer: NSPersistentCloudKitContainer = {
    let container = NSPersistentCloudKitContainer(name: "test")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

SceneDelegate 中设置环境的代码:

    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).

    // 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 = ContentView().environment(\.managedObjectContext, context)

    // Use a UIHostingController as window root view controller.
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = UIHostingController(rootView: contentView)
        self.window = window
        window.makeKeyAndVisible()
    }
}

Answer 1

像您的 moc 这样的环境值只会自动传递到层次结构中的其他 View 。因此，如果您显示工作表或任何不属于 View 层次结构的内容，您将丢失环境，并且需要将 moc 传递到新层次结构，就像您对 ContentView 所做的那样。检查此代码片段:

.sheet(isPresented: self.$showSheet) {
            SheetView()
                .environment(\.managedObjectContext, self.moc)
        }