分类列表页添加商品图片列

app/code/Joshine/Category/Block/Adminhtml/Category/Tab/Product.php

+<?php
+namespace  Joshine\Category\Block\Adminhtml\Category\Tab;
+use Magento\Catalog\Block\Adminhtml\Category\Tab\Product as JoshineProduct;
+
+class Product extends JoshineProduct
+{
+    public function setCollection($collection){
+        echo 111;
+        $collection->addAttributeToSelect('thumbnail');
+        parent::setCollection($collection);
+    }
+
+    protected function _prepareColumns(){
+        parent::_prepareColumns();
+        $this->addColumnAfter('image', array(
+            'header' => __('image'),
+            'index' => 'thumbnail',
+            'renderer' =>'Joshine\Category\Block\Adminhtml\Helper\Form\Image'
+        ), 'sku');
+
+        $this->sortColumnsByOrder();
+        return $this;
+    }
+}
\ No newline at end of file

app/code/Joshine/Category/Block/Adminhtml/Helper/Form/Image.php

+<?php
+namespace  Joshine\Category\Block\Adminhtml\Helper\Form;
+
+use Magento\Backend\Block\Widget\Grid\Column\Renderer\AbstractRenderer;
+use Magento\Framework\DataObject;
+class image extends AbstractRenderer
+{
+    public  function render(DataObject $row)
+    {
+        $objectManager =\Magento\Framework\App\ObjectManager::getInstance();
+        $helperImport = $objectManager->get('\Magento\Catalog\Helper\Image');
+
+        $imageUrl = $helperImport->init($row, 'thumbnail')
+            ->setImageFile($row->getData('thumbnail')) // image,small_image,thumbnail
+            ->resize(380)
+            ->getUrl();
+        if (empty($row->getData('thumbnail')) ){
+            return "<span> No pictures </span>";
+        }
+      return "<img src=". $imageUrl ." width='100' >";
+    }
+}
\ No newline at end of file

app/code/Joshine/Category/etc/adminhtml/di.xml

 <?xml version="1.0"?>
 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <preference for="Magento\Catalog\Block\Adminhtml\Category\Tab\Product"  type="Joshine\Category\Block\Adminhtml\Category\Tab\Product" />
     <type name="Joshine\Category\Controller\Adminhtml\Category\Image\Upload">
     <type name="Joshine\Category\Controller\Adminhtml\Category\Image\Upload">
         <arguments>
         <arguments>
             <argument name="imageUploader" xsi:type="object">Magento\Catalog\CategoryImageUpload</argument>
             <argument name="imageUploader" xsi:type="object">Magento\Catalog\CategoryImageUpload</argument>