删除 SwiftUI 列表中的项目（由核心数据支持）后出现 "Thread 1: EXC_BAD_INSTRUCTION" 错误？（附代码）

Question

完成 SwiftUI 列表中一行的删除后，出现 "Thread 1: EXC_BAD_INSTRUCTION" 错误。似乎核心数据删除在我重新启动数据已被删除后起作用。因此，在执行核心数据删除后，可能与 SwiftUI 尝试更新其视图有关？？？？

代码：

import SwiftUI
import CoreData

struct ContentView: View {
    @Environment(\.managedObjectContext) var context
    @FetchRequest(entity: GCItem.entity(), sortDescriptors: []) var gcItems: FetchedResults<GCItem>

    private func addItem(title:String) {
        let newItem = GCItem(context: context)
        newItem.id = UUID()
        newItem.title = title
        do {
            try context.save()
        } catch let e as NSError {
            fatalError("Unresolved error \(e), \(e.userInfo)")
        }
    }

    private func deleteItem(at offsets:IndexSet) {
        self.context.perform {
            // Delete Item
            for index in offsets {
                let item = self.gcItems[index]
                self.context.delete(item)
            }

            // Persist
            do {
                try self.context.save()
            } catch let e as NSError {
                // TODO: How to undelete list???
                print("ERROR : Can not save GCItem items: \(e.description)")
            }
        }
    }

    var body: some View {
        NavigationView {
            VStack {
                List() {
                    ForEach(gcItems) { gcItem in
                        HStack {
                            Text("test")
                        }
                    }
                    .onDelete(perform: self.deleteItem)
                }
                Button(action: { self.addItem(title: "Testing 123") }) {
                    Text("ADD ITEM")
                }
            }
        }
    }
}
#if DEBUG
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        return ContentView().environment(\.managedObjectContext, context)
    }
}
#endif

屏幕截图

Answer 1

解决方法是不使用名为 "id" 的核心数据中的属性。所以我将其更改为 "myId" 然后一切正常。

删除 SwiftUI 列表中的项目（由核心数据支持）后出现 "Thread 1: EXC_BAD_INSTRUCTION" 错误？（附代码）

after delete of item in SwiftUI List (backed by Core Data) getting a "Thread 1: EXC_BAD_INSTRUCTION" error? (code attached)

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删除 SwiftUI 列表中的项目（由核心数据支持）后出现 "Thread 1: EXC_BAD_INSTRUCTION" 错误？ （附代码）

after delete of item in SwiftUI List (backed by Core Data) getting a "Thread 1: EXC_BAD_INSTRUCTION" error? (code attached)

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删除 SwiftUI 列表中的项目（由核心数据支持）后出现 "Thread 1: EXC_BAD_INSTRUCTION" 错误？（附代码）