View.php

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<?php
namespace Magento\Catalog\Controller\Category;

use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Catalog\Api\CategoryRepositoryInterface;
use Magento\Catalog\Model\Layer\Resolver;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\View\Result\PageFactory;
use Magento\Framework\App\Action\Action;

class View extends Action implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $_coreRegistry = null;

    protected $_catalogSession;

    protected $_catalogDesign;

    protected $_storeManager;

    protected $categoryUrlPathGenerator;

    protected $resultPageFactory;

    protected $resultForwardFactory;

    private $layerResolver;

    protected $categoryRepository;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Catalog\Model\Design $catalogDesign,
        \Magento\Catalog\Model\Session $catalogSession,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\CatalogUrlRewrite\Model\CategoryUrlPathGenerator $categoryUrlPathGenerator,
        PageFactory $resultPageFactory,
        \Magento\Framework\Controller\Result\ForwardFactory $resultForwardFactory,
        Resolver $layerResolver,
        CategoryRepositoryInterface $categoryRepository
    ) {
        parent::__construct($context);
        $this->_storeManager = $storeManager;
        $this->_catalogDesign = $catalogDesign;
        $this->_catalogSession = $catalogSession;
        $this->_coreRegistry = $coreRegistry;
        $this->categoryUrlPathGenerator = $categoryUrlPathGenerator;
        $this->resultPageFactory = $resultPageFactory;
        $this->resultForwardFactory = $resultForwardFactory;
        $this->layerResolver = $layerResolver;
        $this->categoryRepository = $categoryRepository;
    }

    protected function _initCategory()
    {
        $categoryId = (int)$this->getRequest()->getParam('id', false);
        if (!$categoryId) {
            return false;
        }

        try {
            $category = $this->categoryRepository->get($categoryId, $this->_storeManager->getStore()->getId());
        } catch (NoSuchEntityException $e) {
            return false;
        }
        if (!$this->_objectManager->get(\Magento\Catalog\Helper\Category::class)->canShow($category)) {
            return false;
        }
        $this->_catalogSession->setLastVisitedCategoryId($category->getId());
        $this->_coreRegistry->register('current_category', $category);
        try {
            $this->_eventManager->dispatch(
                'catalog_controller_category_init_after',
                ['category' => $category, 'controller_action' => $this]
            );
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
            return false;
        }

        return $category;
    }

    public function execute()
    {
        if ($this->_request->getParam(\Magento\Framework\App\ActionInterface::PARAM_NAME_URL_ENCODED)) {
            return $this->resultRedirectFactory->create()->setUrl($this->_redirect->getRedirectUrl());
        }
        $category = $this->_initCategory();
        if ($category) {
            $this->layerResolver->create(Resolver::CATALOG_LAYER_CATEGORY);
            $settings = $this->_catalogDesign->getDesignSettings($category);

            // apply custom design
            if ($settings->getCustomDesign()) {
                $this->_catalogDesign->applyCustomDesign($settings->getCustomDesign());
            }

            $this->_catalogSession->setLastViewedCategoryId($category->getId());

            $page = $this->resultPageFactory->create();
            // apply custom layout (page) template once the blocks are generated
            if ($settings->getPageLayout()) {
                $page->getConfig()->setPageLayout($settings->getPageLayout());
            }

            $hasChildren = $category->hasChildren();
            if ($category->getIsAnchor()) {
                $type = $hasChildren ? 'layered' : 'layered_without_children';
            } else {
                $type = $hasChildren ? 'default' : 'default_without_children';
            }

            if (!$hasChildren) {
                // Two levels removed from parent.  Need to add default page type.
                $parentType = strtok($type, '_');
                $page->addPageLayoutHandles(['type' => $parentType], null, false);
            }
            $page->addPageLayoutHandles(['type' => $type], null, false);
            $page->addPageLayoutHandles(['id' => $category->getId()]);

            // apply custom layout update once layout is loaded
            $layoutUpdates = $settings->getLayoutUpdates();
            if ($layoutUpdates && is_array($layoutUpdates)) {
                foreach ($layoutUpdates as $layoutUpdate) {
                    $page->addUpdate($layoutUpdate);
                    $page->addPageLayoutHandles(['layout_update' => md5($layoutUpdate)], null, false);
                }
            }

            $page->getConfig()->addBodyClass('page-products')
                ->addBodyClass('categorypath-' . $this->categoryUrlPathGenerator->getUrlPath($category))
                ->addBodyClass('category-' . $category->getUrlKey());

            return $page;
        } elseif (!$this->getResponse()->isRedirect()) {
            return $this->resultForwardFactory->create()->forward('noroute');
        }
    }
}