SwiftUI 中如何在 ContentView 之外使用 CoreData ?

开发 macOS 应用程序, 想在 MenuBarExtra 里访问 CoreData:

struct Project: App { @StateObject private var dataCOntroller= DataController() @FetchRequest(sortDescriptors: []) var students: FetchedResults<Student> var body: some Scene { MainScene() Settings { Text("Setting") } MenuBarExtra("Menu", systemImage: "swift") { List(students) { student in Text(student.name ?? "Unknown") } Divider() Button("Add") { let id = UUID() let name = "Foo" let cOntext= dataController.container.viewContext let student = Student(context: context) student.id = id student.name = name try? context.save() } } } } 

我刚接触 CoreData, 参照 hackingwithswift 的例子, 它是将 viewContext 传递给 enviroment 中, 所以在 ContentView 里面都可以直接访问 @Environment(\.managedObjectContext) var moc.

但在 MenuBarExtra 中不知道如何处理, 无法注入 context, 并且当我按照上述例子中直接使用 context 时候编译器会报错:

Context in environment is not connected to a persistent store coordinator.