如何从dataController中显示.Alert

Question

我正在尝试在“ datacontroller”文件中设置警报，而没有任何成功！

在SwiftUi视图中，我可以轻松地这样做，

// Before the body
@State private var showAlert = false

// Inside the body
.onTapGesture { showAlert.toggle() }
.alert("There is an error", isPresented: $showAlert) { }

但是在我的datacontroller中，我实际上不知道如何执行它：

// DataController.swift
struct DataController {

    static let shared = DataController()

    let container: NSPersistentContainer

    init(inMemory: Bool = false) {

        container = NSPersistentContainer(name: "ItemModel")

        if inMemory {
            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
        }

        container.loadPersistentStores(completionHandler: { (storeDescription, error) in

            if let error = error {
                // SOMETHING HERE?
                print("Core Data failed to load: \(error.localizedDescription)!")
            }

            // print("Core Data succeed to load!")

        })

        container.viewContext.automaticallyMergesChangesFromParent = true

    }

    func save(context: NSManagedObjectContext) {

        // try? context.save()

        do {
            try context.save()
            // print("Core Data succeed to save!")
        } catch {
            // SOMETHING HERE?
            print("Core Data failed to save!")
        }

    }

    // Some other functions below...

}

您有任何想法吗？ ：d

[edit]

这是我的函数创建，例如：

func createItem( /* Some stuff here */ ) {

    let item = Item(context: context)

    /* Some stuff here */

    save(context: context)

}

这就是我在swiftui视图中称其为：

// Inside a button
DataController.shared.createItem( /* Some stuff here */ )
presentationMode.wrappedValue.dismiss()