通过尝试删除，对UITableViewCell的自定义编辑操作在滑动时崩溃

Question

I added a custom swipe to share action on my UITableViewCells in my UITableView. My problem is that for some reason it won't even let me swipe the cell. It immediately crashes with this line:

reason: 'attempt to delete row 25 from section 0 which only contains 25 rows before the update'

However, I'm not trying to delete anything! It's a share button not a delete button. Here are the relevant methods I've added:

override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? {
    let shareAction = UITableViewRowAction(style: .Normal, title: "Share") { (action: UITableViewRowAction, indexPath: NSIndexPath) -> Void in
        // Some stuff
    }
    shareAction.backgroundColor = UIColor.yellowColor()
    return [shareAction]
}

override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

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

Why is my table view controller giving me this error when it should have no business attempting to delete anything?

Answer 1

It turns out it was an issue unrelated to the three methods above. My table view controller is a PFQueryTableViewController subclass which has numberOfRowsInSection baked in out of the box. My problem was that I explicitly added that method when I shouldn't have. Therefore it was being called when it shouldn't have been (it's build into the subclass implicitly), resulting in some wonky behavior. I removed my call to numberOfRowsInSection and it worked as it should.