ios 8 editing tableviewcell deleting a row removes the delete button

问题

While editing my tableview, If I delete a row, the button for delete option disappears. This was working perfectly in iOS7, but now in iOS8, I find this bug.

Is this some Apple bug, or Am I doing something wrong?

Here is an image while editing:

and this is an image after I delete a row. The - button is nowhere to be seen.

Also, It does not remove the edit mode, only the button disappears

来源：https://stackoverflow.com/questions/24806850/ios-8-editing-tableviewcell-deleting-a-row-removes-the-delete-button