UITableViewRowAction works in simulator but not on device?

Question

I have a table view with UITableViewRowAction on the cells so I can swipe a cell to reveal an action. It works perfectly on the simulator but not on device. Any ideas why?

var deleteButton = UITableViewRowAction(style: .Default, title: "delete", handler: { (action, indexPath) in
            self.foodTableView.dataSource?.tableView?(
                self.foodTableView,
                commitEditingStyle: .Delete,
                forRowAtIndexPath: indexPath

            )

        return [deleteButton]
    }