Usecustom.php

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<?php
namespace Magento\Config\Model\Config\Backend\Admin;

class Usecustom extends \Magento\Framework\App\Config\Value
{
    protected $_configWriter;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\App\Config\Storage\WriterInterface $configWriter,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_configWriter = $configWriter;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function beforeSave()
    {
        $value = $this->getValue();
        if ($value == 1) {
            $customUrl = $this->getData('groups/url/fields/custom/value');
            if (empty($customUrl)) {
                throw new \Magento\Framework\Exception\LocalizedException(__('Please specify the admin custom URL.'));
            }
        }

        return $this;
    }

    public function afterSave()
    {
        $value = $this->getValue();

        if (!$value) {
            $this->_configWriter->delete(
                Custom::XML_PATH_SECURE_BASE_URL,
                Custom::CONFIG_SCOPE,
                Custom::CONFIG_SCOPE_ID
            );
            $this->_configWriter->delete(
                Custom::XML_PATH_UNSECURE_BASE_URL,
                Custom::CONFIG_SCOPE,
                Custom::CONFIG_SCOPE_ID
            );
        }

        return parent::afterSave();
    }
}