Question

我有以下代码从Core Data中删除记录：

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()
        }
    }

代码成功删除了记录，但它也崩溃了应用程序。其他一切都很好。我在这里做错了什么？

PS：这是我收到的错误消息：

由于未捕获的异常而终止应用 'NSInternalInconsistencyException'，原因：'无效更新：无效第0节中的行数。包含在中的行数更新后的现有部分（1）必须等于数量在更新（1）之前，该部分中包含的行加或减从该部分插入或删除的行数（插入0，删除1）加上或减去移入或移出的行数该部分（0移入，0移出）。

PPS：根据@GeneratorOfOne的要求，以下是代码的其余部分：

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

您还必须从数据源阵列中删除该项目。

我建议订单首先从数据源（模型）和表格视图（视图）中删除项目，然后删除核心数据中的项目。

重要提示：deleteRowsAtIndexPaths会自动重新排序表格。您不得致电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。然后您可以轻松管理tableView。如果要在Core Data中的UITableView上删除，更新或插入对象！

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()
    }
}

核心数据删除问题

2 个答案: