核心数据删除的问题

Question

我有下面的代码从核心数据删除一条记录：

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath){ 
     if (editingStyle == UITableViewCellEditingStyle.Delete) { 

      let recordToDelete = varUserClients[indexPath.row] 

      let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 

      let managedContext = appDelegate.managedObjectContext 

      managedContext.deleteObject(recordToDelete) 

       do { 
        try managedContext.save() 

       } catch let error as NSError { 

        NSLog("Could not save \(error), \(error.userInfo)") 
      } 

      clientsTableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic) 

      clientsTableView.reloadData() 
     } 
    } 

代码成功删除的记录，但它也崩溃的应用程序。其他一切正常。我在这里做错了什么？

PS：这是错误消息我得到：

终止应用程序由于未捕获的异常 “NSInternalInconsistencyException”，理由是：“无效的更新：无效 中的行数节0数在更新（1）之后，包含在 现有节中的行的数量必须等于在更新（1）之前包含在该节中的 行的数量，正数或负数 插入或从该节中删除的行数（0插入， 1删除）并加上或减去移入或移出的行数该部分（0移入，0移出）。

PPS：按照要求通过@GeneratorOfOne，这里的其余代码：

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return varUserClients.count 
    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 

     let IndividualCell = clientsTableView.dequeueReusableCellWithIdentifier("ClientCell", forIndexPath: indexPath) as! CUSTOMCLIENTS 

     let client = varUserClients[indexPath.row] 

     let varFirstName = client.valueForKey("clientsFirstName") as! String 
     let varLastName = client.valueForKey("clientsLastName") as! String 
     let varFullName = String("\(varFirstName) \(varLastName)") 

     IndividualCell.outletLabel_UserClientFullName.text = varFullName 

     IndividualCell.outletLabel_UserClientPhoneNumber.text = (client.valueForKey("clientsMobilePhoneNumber") as! String) 

     IndividualCell.outletLabel_UserClientEmailAddress.text = (client.valueForKey("clientsWorkEmailAddress") as! String) 

     IndividualCell.outletLabel_UserClientPosition.text = (client.valueForKey("clientsJobTitle") as! String) 

     IndividualCell.outletLabel_UserClientDistributionList.text = (client.valueForKey("clientsDistributionList") as! String) 

     let varSelectPriorityPic = client.valueForKey("clientsDistributionList") as! String 
     switch varSelectPriorityPic { 
     case constRiskMatrixCodeLevel01: 
      IndividualCell.outletImage_UserClientDistributionListImage.image = UIImage(named: "clientpriority1") 
     case constRiskMatrixCodeLevel02: 
      IndividualCell.outletImage_UserClientDistributionListImage.image = UIImage(named: "clientpriority2") 
     case constRiskMatrixCodeLevel03: 
      IndividualCell.outletImage_UserClientDistributionListImage.image = UIImage(named: "clientpriority3") 
     case constRiskMatrixCodeLevel04: 
      IndividualCell.outletImage_UserClientDistributionListImage.image = UIImage(named: "clientpriority4") 
     case constRiskMatrixCodeLevel05: 
      IndividualCell.outletImage_UserClientDistributionListImage.image = UIImage(named: "clientpriority5") 
     default: 
      break 
     } 
     return IndividualCell 
    } 

Answer 1

还必须删除从数据源阵列的项目。

我建议先删除数据源（模型）和表格视图（视图）中的项目，然后删除核心数据中的项目。

重要注意事项：deleteRowsAtIndexPaths自动重新排序表。你不能叫reloadData()

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath){ 
    if (editingStyle == UITableViewCellEditingStyle.Delete) { 

     let recordToDelete = varUserClients[indexPath.row] 
     varUserClients.removeAtIndex(indexPath.row) 
     clientsTableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic) 

     let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
     let managedContext = appDelegate.managedObjectContext 
     managedContext.deleteObject(recordToDelete) 
     do { 
      try managedContext.save() 
     } catch let error as NSError { 
      NSLog("Could not save \(error), \(error.userInfo)") 
     } 
    } 
} 

Answer 2

您可以使用NSFetchedResultsController及其委托协议方法。然后你可以轻松管理你的tableView。如果你想删除，更新或插入核心数据UITableView中的对象！

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath){ 
    if (editingStyle == UITableViewCellEditingStyle.Delete) { 

     let recordToDelete = varUserClients[indexPath.row] 

     let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 

     let managedContext = appDelegate.managedObjectContext 

     managedContext.deleteObject(recordToDelete) 

      do { 
       try managedContext.save() 

      } catch let error as NSError { 

       NSLog("Could not save \(error), \(error.userInfo)") 
     } 

     // clientsTableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic) 
     // This is should be works! Try this out 

     clientsTableView.reloadData() 
    } 
}