ios - 如何通过数据图将新的 Core Data 实体与代码同步？

Question

我只想将一个实体添加到现有的 NSManagedObject 数据图并在代码中访问该实体。在这种情况下，我添加了“地址”：

现有代码有效。我只是补充说：

let address = Address(context:self.context!)

...就像最初对 Person() 实体所做的那样。

这是错误：

这是代码：

func application(_ application: UIApplication, didFinishLaunchingWithOptions
        launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {

        self.context = persistentContainer.viewContext
        let storyboard = self.window?.rootViewController?.storyboard
        guard let vc = storyboard?.instantiateViewController(withIdentifier: "RootViewController") as? RootViewController
            else { fatalError("Cannot instantiate root view controller") }
        vc.context = self.context
        self.window?.rootViewController = vc    // Note: necessary to keep the app del's context instance within vc.

        let address = Address(context:self.context!)

        let person = Person(context: self.context!)
        person.firstName = "Foo"
        person.lastName = "Bar"

        person.cars = NSSet(array: [
            Car(context: self.context!).configured(maker: "VW",
                                                   model: "Sharan",
                                                   owner: person),
            Car(context: self.context!).configured(maker: "VW",
                                                   model: "Tiguan",
                                                   owner: person)
            ])

        do{
            try saveContext()
        } catch {
            //something bad happened, handle this situation appropriately
        }

        return true
    }

问题：如何让代码看到新实体“地址”？