Joomla: Use custom field for layout in category view

blog.php

<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_content
 *
 * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

if (property_exists($this->category, 'jcfields'))
{
	$fields = $this->category->jcfields;
}
else
{
	$fields = FieldsHelper::getFields('com_content.categories', $this->category);
}

$layout = 'default';

foreach ($fields as $field)
{
	if ($field->name === 'custom-category-layout')
	{
		$customLayout = trim($field->rawvalue);

		if (!empty($customLayout))
		{
			$layout = $customLayout;
		}

		break;
	}
}

echo '<pre>'; print_r($layout); echo '</pre>';