如何解决“无法在NSManagedObject类上调用指定的初始化程序”

Question

  

2019-08-18 08：27：21.189525 + 0700 CoreDataTodoList [912：22298] [错误]错误：   CoreData：错误：无法在上调用指定的初始化程序   NSManagedObject类'CoreDataTodoList.Item'   CoreData：错误：CoreData：错误：无法调用指定的初始化程序   NSManagedObject类'CoreDataTodoList.Item'

     

2019-08-18 08：27：21.189667 + 0700 CoreDataTodoList [912：22298]-   [CoreDataTodoList.Item setTitle：]：无法识别的选择器已发送到实例0x600002395280   2019-08-18 08：27：21.192830 + 0700 CoreDataTodoList [912：22298] *   由于未捕获的异常“ NSInvalidArgumentException”而终止应用程序，   原因：'-[CoreDataTodoList.Item setTitle：]：无法识别的选择器已发送到实例0x600002395280'   * 首先抛出调用堆栈：

import UIKit
import CoreData

class TodoListTableViewController: UITableViewController,UISearchBarDelegate  {

    @IBOutlet var mTableView: UITableView!
    @IBOutlet weak var mSearchBar: UISearchBar!
    @IBOutlet weak var mAddItem: UIBarButtonItem!

    var dataList = [Item]()
    let dataFilePath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("Items.plist")
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

    override func viewDidLoad() {
        super.viewDidLoad()

      print("----->", dataFilePath)

        let newItem = Item()
        newItem.title = "Car Book Catalog"

        dataList.append(newItem)

        let newItem2 = Item()
        newItem2.title = "Mobile Book Catalog"
        dataList.append(newItem2)

        let newItem3 = Item()
        newItem3.title = "Programming Book Catalog"
        dataList.append(newItem3)

    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return dataList.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        print("indexpath.row call for row at")
        print("....")
        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseCell", for: indexPath)

        let item = dataList[indexPath.row]
        cell.textLabel?.text = item.title

        cell.accessoryType = item.done ? .checkmark : .none


        return cell
    }


    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        dataList[indexPath.row].done = !dataList[indexPath.row].done

        self.saveItem()

        tableView.deselectRow(at: indexPath, animated: true)
    }


    @IBAction func btnAddItem(_ sender: UIBarButtonItem) {

       var mAlertTextField = UITextField()
        let alert = UIAlertController(title: "Add new todo list", message: "input your info", preferredStyle: .alert)
        let actionCancel = UIAlertAction(title: "Calcel", style: .cancel, handler: nil)
        let action = UIAlertAction(title: "Add", style: .default) { (action) in
            newItem.done = false
            newItem.title = mAlertTextField.text!

            self.dataList.append(newItem)

            self.saveItem()

            print(mAlertTextField.text)
        }

        alert.addTextField { (alertTextField) in
            alertTextField.placeholder = "Create a new todo list here"
            mAlertTextField = alertTextField
        }

        alert.addAction(action)
        alert.addAction(actionCancel)
        present(alert, animated: true, completion: nil)
    }

    func saveItem() {

        do{
          try context.save()
        }catch {
            print("error saving context \(error)")
        }
        mTableView.reloadData()
    }

}