从部分中包含多行的 tableView 中删除一行

Question

当我尝试从包含多行的部分中删除一行时，当我向左滑动以显示删除按钮并按下它时，它会在刷新 tableView 后将其删除，但在视觉上它什么也没做。如果我再次按下它，它会删除该部分中的两行。如果我不再次按下它并按下返回然后返回到那个 viewController，则删除有效但动画从未发生。在只有一个单元格的部分中删除一个单元格效果很好。当该部分中有 2 个或更多单元格时，永远不会调用委托函数，但会调用 commitEditingStyle。让我知道您是否需要更多代码。谢谢

这是我的 NSFetchedResultsControllerDelegate 方法

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {


        let object = self.fetchedResultsController.objectAtIndexPath(indexPath) as NSManagedObject
        self.context.deleteObject(object)
        try! context.save()
}

func controllerWillChangeContent(controller: NSFetchedResultsController) {

}

func controllerDidChangeContent(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?)
{
    var tableView = self.tableView as UITableView
    switch(type)
    {
    case .Delete:
        if let indexPath = indexPath
        {
            print("delete")
            tableView.deleteRowsAtIndexPaths(NSArray(object:indexPath) as! [NSIndexPath], withRowAnimation: UITableViewRowAnimation.Fade)
        }
        break
    case .Update:
        if let indexPath = indexPath
        {
            if let cell = tableView.cellForRowAtIndexPath(indexPath)
            {
            cell.textLabel!.text = (self.fetchedResultsController.valueForKey("firstName") as! String) + " " + (self.fetchedResultsController.valueForKey("lastName") as! String)
                print("update")
            }
        }
    default:
        break
    }


}

func controller(controller: NSFetchedResultsController,
    didChangeSection sectionInfo: NSFetchedResultsSectionInfo,
    atIndex sectionIndex: Int,
    forChangeType type: NSFetchedResultsChangeType)
{
    switch(type)
    {
    case .Delete:
        tableView.deleteSections(NSIndexSet(index:sectionIndex), withRowAnimation: UITableViewRowAnimation.Fade)
    break
    default:
    break
    }
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {

}

解决方案：我需要在 commitEditingStyle 函数的末尾添加一个 self.tableView.reloadData()

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {


        let object = self.fetchedResultsController.objectAtIndexPath(indexPath) as NSManagedObject
        self.context.deleteObject(object)
        try! context.save()
self.tableView.reloadData()
}

Answer 1

删除该行后添加一个self.tableView.reloadData()，或者该行在技术上已被删除，但table 视图尚未更新。请参阅下面的更新代码...

        func controller(controller: NSFetchedResultsController,
            didChangeSection sectionInfo: NSFetchedResultsSectionInfo,
            atIndex sectionIndex: Int,
            forChangeType type: NSFetchedResultsChangeType)
        {
            switch(type)
            {
            case .Delete:

//this creates the delete annimation
                tableView.deleteSections(NSIndexSet(index:sectionIndex), withRowAnimation: UITableViewRowAnimation.Fade)

 //this deletes the row from the array
    self.array.removeAtIndex(indexPath.row)        

//this reloads the table view so you can see the row deleted.
        self.tableView.reloadData()



            break
            default:
            break
            }
        }

从部分中包含多行的 tableView 中删除一行

Deleting a row from a tableView with multiple rows in section

tableview

nsfetchedresultscontroller

ios

swift