使用TableView中的核心数据添加书签按钮

Question

问题： - 从核心数据中删除行时遇到问题。每当我执行删除功能时，行中的值将更改为0，但该行仍存在于Core数据库中。如何完全删除下面编写代码中的行？

我有tableView显示一些列表，每个单元格都有一个带灰色书签图像的按钮作为默认值。

当我点击bookmarkBtn时，按钮图像变为蓝色图像，数据由coreData存储。再次单击后，bookmarkBtn再次变为灰色图像，核心数据中的条目将被删除。

 //Code:- **when bookmarkBtn is clicked.**
 @IBAction func btnClicked(_ sender: UIButton)
    {
      let position: CGPoint = sender.convert(CGPoint.zero, to: self.tableView)
      let indexPath = self.tableView.indexPathForRow(at: position)!
      sender.tag = indexPath.row
      let cell: TableViewCell = self.tableView.cellForRow(at: indexPath) as! TableViewCell
    // print("Favorite button tapped")
      if sender.isSelected != true
         {
          cell.bookmarkBtn.setImage(UIImage(named: "bookmark_blue"), for: UIControlState.normal);
          sender.isSelected = true;
          saveItem(itemToSave:sender.tag)
          self.bookmarkArrState.replaceObject(at: (indexPath.row), with:1);
         } 
        else
        {
         cell.bookmarkBtn.setImage(UIImage(named: "bookmark_grey" ), for: UIControlState.normal);
         sender.isSelected = false;
         removeData(itemToDelete: sender.tag)
         self.bookmarkArrState.replaceObject(at: (indexPath.row), with:0)
       }

   }

  //Code:- **Saving values in CoreData**
  func saveItem(itemToSave: Int){
     let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
     //**Note:** Here we are providing the entityName **`Entity`** that we have added in the model
     let entity = NSEntityDescription.entity(forEntityName: "AddedBookmark", in: context)
    let myItem = NSManagedObject(entity: entity!, insertInto: context)
    myItem.setValue(itemToSave, forKey: "indexNo")
    do {
        try context.save()
        }
    catch{
        print("There was an error in saving data")  
    }
}

 //**Code:- Deleting Data when bookmarkBtn is clicked again**
 func removeData(itemToDelete: Int)
{
    let mngdCntxt = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

    //**Note:** Here we are providing the entityName **`Entity`** that we have added in the model
    let entity = NSEntityDescription.entity(forEntityName: "AddedBookmark", in: mngdCntxt)
    let myItem = NSManagedObject(entity: entity!, insertInto: mngdCntxt)


    if let dataAppDelegatde = UIApplication.shared.delegate as? AppDelegate {
       let mngdCntxt = dataAppDelegatde.persistentContainer.viewContext
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "AddedBookmark")
        let predicate = NSPredicate(format: "indexNo = %i", Int(itemToDelete))
        print("item selected :-\(itemToDelete)")
        fetchRequest.predicate = predicate
        do{
            var result = try mngdCntxt.fetch(fetchRequest)

            print(result.count)
            print(fetchRequest)


            if result.count > 0{
                for object in result
                {
                    print(object)
                    mngdCntxt.performAndWait {
                        mngdCntxt.delete(result[0] as! NSManagedObject)
                        mngdCntxt.refreshAllObjects()  
                    }
                }
            }
            do {
                try mngdCntxt.save()
            }
            catch{
                print("There was an error in saving data")
            }
        }   
        catch{
        }
    }
}