How to limit UITableView row reordering to a section

gistfile1.swift

    override func tableView(tableView: UITableView, targetIndexPathForMoveFromRowAtIndexPath sourceIndexPath: NSIndexPath, toProposedIndexPath proposedDestinationIndexPath: NSIndexPath) -> NSIndexPath {
        if sourceIndexPath.section != proposedDestinationIndexPath.section {
            var row = 0
            if sourceIndexPath.section < proposedDestinationIndexPath.section {
                row = tableView.numberOfRowsInSection(sourceIndexPath.section) - 1
            }
            return NSIndexPath(forItem: row, inSection: sourceIndexPath.section)
        }
        return proposedDestinationIndexPath;
    }

Thanks! 👍