SwiftUI 中如何在 ContentView 之外使用 CoreData ?

[FaiChou]

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.

ps. 没有 UIKit AppKit 的开发经验

[FaiChou]

问题已解决: https://stackoverflow.com/questions/74397557/how-to-use-core-data-on-menubarextra-in-swiftui/74399464#74399464