Customer.php

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<?php
namespace Magento\Customer\Model\Config\Backend\Show;

use Magento\Eav\Model\Entity\Attribute\AbstractAttribute;

class Customer extends \Magento\Framework\App\Config\Value
{
    protected $_eavConfig;

    protected $storeManager;

    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\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Eav\Model\Config $eavConfig,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_eavConfig = $eavConfig;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
        $this->storeManager = $storeManager;
    }

    protected function _getAttributeCode()
    {
        return str_replace('_show', '', $this->getField());
    }

    protected function _getAttributeObjects()
    {
        return [$this->_eavConfig->getAttribute('customer', $this->_getAttributeCode())];
    }

    public function afterSave()
    {
        $result = parent::afterSave();

        $valueConfig = [
            '' => ['is_required' => 0, 'is_visible' => 0],
            'opt' => ['is_required' => 0, 'is_visible' => 1],
            '1' => ['is_required' => 0, 'is_visible' => 1],
            'req' => ['is_required' => 1, 'is_visible' => 1],
        ];

        $value = $this->getValue();
        if (isset($valueConfig[$value])) {
            $data = $valueConfig[$value];
        } else {
            $data = $valueConfig[''];
        }

        if ($this->getScope() == 'websites') {
            $website = $this->storeManager->getWebsite($this->getScopeCode());
            $dataFieldPrefix = 'scope_';
        } else {
            $website = null;
            $dataFieldPrefix = '';
        }

        foreach ($this->_getAttributeObjects() as $attributeObject) {
            if ($website) {
                $attributeObject->setWebsite($website);
                $attributeObject->load($attributeObject->getId());
            }
            $attributeObject->setData($dataFieldPrefix . 'is_required', $data['is_required']);
            $attributeObject->setData($dataFieldPrefix . 'is_visible', $data['is_visible']);
            $attributeObject->save();
        }

        return $result;
    }

    public function afterDelete()
    {
        $result = parent::afterDelete();

        if ($this->getScope() == 'websites') {
            $website = $this->storeManager->getWebsite($this->getScopeCode());
            foreach ($this->_getAttributeObjects() as $attributeObject) {
                $attributeObject->setWebsite($website);
                $attributeObject->load($attributeObject->getId());
                $attributeObject->setData('scope_is_required', null);
                $attributeObject->setData('scope_is_visible', null);
                $attributeObject->save();
            }
        }

        return $result;
    }
}