从 swift 中的表视图中删除项目时出错

Question

我正在尝试在我的应用程序中实现删除功能，允许用户删除存储在核心数据中并通过 table 视图呈现的信息。

这是我的代码：

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


    tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic) //error on this line

        }
}

错误如下：

Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UITableView.m:1582
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (6) must be equal to the number of rows contained in that section before the update (6), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

我究竟做错了什么？我该如何解决这个错误？

Answer 1

删除核心数据项并让委托回调负责删除 table 视图行：

if editingStyle == .Delete {
  let item = self.fetchedResultsController.objectAtIndexPath(indexPath) as NSManagedObject
  self.managedObjectContext.deleteObject(item)
}

行删除发生在委托回调中 controller:didChangeObject:atIndexPath: forChangeType:newIndexPath:

if type == .Delete { 
  self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}

从 swift 中的表视图中删除项目时出错

Error when deleting item from tableview in swift

core-data

swift

ios8

tableview