newsupernova/app/code/Magefan/Blog/Block/Category/View.php

<?php
/**
 * Copyright © 2015-2017 Ihor Vansach (ihor@magefan.com). All rights reserved.
 * See LICENSE.txt for license details (http://opensource.org/licenses/osl-3.0.php).
 *
 * Glory to Ukraine! Glory to the heroes!
 */

namespace Magefan\Blog\Block\Category;

use Magento\Store\Model\ScopeInterface;

/**
 * Blog category view
 */
class View extends \Magefan\Blog\Block\Post\PostList
{
    /**
     * Prepare posts collection
     *
     * @return void
     */
    protected function _preparePostCollection()
    {
        parent::_preparePostCollection();
        if ($category = $this->getCategory()) {
            $this->_postCollection->addCategoryFilter($category);
        }
    }

    /**
     * Retrieve category instance
     *
     * @return \Magefan\Blog\Model\Category
     */
    public function getCategory()
    {
        return $this->_coreRegistry->registry('current_blog_category');
    }

    /**
     * Preparing global layout
     *
     * @return $this
     */
    protected function _prepareLayout()
    {
        $category = $this->getCategory();
        if ($category) {
            $this->_addBreadcrumbs($category);
            $this->pageConfig->addBodyClass('blog-category-' . $category->getIdentifier());
            $this->pageConfig->getTitle()->set($category->getMetaTitle());
            $this->pageConfig->setKeywords($category->getMetaKeywords());
            $this->pageConfig->setDescription($category->getMetaDescription());
            $this->pageConfig->addRemotePageAsset(
                $category->getCanonicalUrl(),
                'canonical',
                ['attributes' => ['rel' => 'canonical']]
            );

            $pageMainTitle = $this->getLayout()->getBlock('page.main.title');
            if ($pageMainTitle) {
                $pageMainTitle->setPageTitle(
                    $this->escapeHtml($category->getTitle())
                );
            }
        }

        return parent::_prepareLayout();
    }

    /**
     * Prepare breadcrumbs
     *
     * @param  string $title
     * @param  string $key
     * @throws \Magento\Framework\Exception\LocalizedException
     * @return void
     */
    protected function _addBreadcrumbs($title = null, $key = null)
    {
        parent::_addBreadcrumbs();
        if ($breadcrumbsBlock = $this->getBreadcrumbsBlock()) {
            $category = $this->getCategory();
            $parentCategories = [];
            while ($parentCategory = $category->getParentCategory()) {
                $parentCategories[] = $category = $parentCategory;
            }

            for ($i = count($parentCategories) - 1; $i >= 0; $i--) {
                $category = $parentCategories[$i];
                $breadcrumbsBlock->addCrumb('blog_parent_category_' . $category->getId(), [
                    'label' => $category->getTitle(),
                    'title' => $category->getTitle(),
                    'link'  => $category->getCategoryUrl()
                ]);
            }

            $category = $this->getCategory();
            $breadcrumbsBlock->addCrumb('blog_category',[
                'label' => $category->getTitle(),
                'title' => $category->getTitle()
            ]);
        }
    }
}