UITableViewCell滑动不显示删除按钮

Question

I'm currently working on a UITableViewController demo which works just the way I wanted it to work.

The only thing I don't get is the missing delete button, when swiping to the left on a row.

The "space" of the button and also the delete functionality are there, but neither the red rectangle button nor the text "delete" shows up.

This happens in the simulator and also on the device.

Of course, I have implemented "edititingStyleForRowAtIndexPath'

override func tableView(tableView: UITableView, editingStyleForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCellEditingStyle {
    switch indexPath.section{
    case SectionConstants.MODEL_DATA_SECTION: return UITableViewCellEditingStyle.Delete
    case SectionConstants.NEW_DATA_SECTION: return UITableViewCellEditingStyle.Insert
    default: return UITableViewCellEditingStyle.None
    }
}

and 'commitEditingStyle' which is irrelevant for this, as it is triggered after the delete button has been touched.

Does anyone have any idea what could cause this behavior or faced a similar issue?

Best regards, Steffen

[Edit] Actually, I forgot to add a screenshot :)

Answer 1

Try this

override func tableView(tableView: UITableView, commitEditingStyle editingStyle:
UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if editingStyle == .Delete {
        // Delete the row from the data source
        self.tableView.reloadData()
    }
}

Answer 2

After researching more in that direction @maddy mentioned, I found the issue.

Since I want to add/remove one last row in the list to enter new data in "normal" mode, but not in "edit" mode, I'm overriding func setEditing and calling tableView.reloadData() there.

override func setEditing(editing: Bool, animated: Bool) {
    super.setEditing(editing, animated: animated)
    tableView.reloadData() // Recall numberOfRowsInSection to show/hide the "new cell"
}

So I now have to find out, how to manually trigger the calculation of row numbers and that's it.