我想在自定义模块中为自定义图像添加view.xml。我使用了以下方法：

1. 创建etc / view.xml

   <view xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/view.xsd">
   <media>
       <images module="VendorName_ModuleName">
           <image id="custom_image" type="custom_image">
               <width>100</width>
               <height>100</height>
           </image>
       </images>
   </media>
   </view>
   

2. 创建图像模型类以覆盖目录图像模型中的init函数

<?php
namespace VendorName\ModuleName\Model;

use Magento\Catalog\Helper\Image as CatalogImage;

class Image extends CatalogImage
{
    /**
     * Initialize Helper to work with Image
     *
     * @param \Magento\Catalog\Model\Product $product
     * @param string $imageId
     * @param array $attributes
     * @return $this
     */
    public function init($product,$imageId,$attributes = [])
    {
        $this->_reset();

        $this->attributes = array_merge(
            $this->getconfigView()->getMediaAttributes('VendorName_ModuleName',self::MEDIA_TYPE_CONFIG_NODE,$imageId),$attributes
        );

        $this->setProduct($product);
        $this->setImageProperties();
        $this->setWatermarkProperties();

        return $this;
    }
}

1. 在di.xml中，使用我们的自定义类替换Magento \ Catalog \ Model \ View \ Asset \ Image类中的mediaConfig的参数

<type name="Magento\Catalog\Model\View\Asset\Image">
        <arguments>
            <argument name="mediaConfig" xsi:type="object">VendorName\ModuleName\Model\Media\Config</argument>
        </arguments>
    </type>

1. VendorName \ ModuleName \ Model \ Media \ Config类：

<?php
namespace VendorName\ModuleName\Model\Media;

use Magento\Eav\Model\Entity\Attribute;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Catalog\Model\Product\Media\ConfigInterface;

class Config implements ConfigInterface
{
    /**
     * Store manager
     *
     * @var StoreManagerInterface
     */
    protected $storeManager;

    /**
     * @var Attribute
     */
    private $attributeHelper;

    /**
     * @var string[]
     */
    private $mediaAttributeCodes;

    /**
     * @param StoreManagerInterface $storeManager
     */
    public function __construct(StoreManagerInterface $storeManager)
    {
        $this->storeManager = $storeManager;
    }

    /**
     * Get filesystem directory path for product images relative to the media directory.
     *
     * @return string
     */
    public function getBaseMediaPathAddition()
    {
        return 'media_folder_path';
    }

    /**
     * Get web-based directory path for product images relative to the media directory.
     *
     * @return string
     */
    public function getBaseMediaUrlAddition()
    {
        return 'media_folder_path';
    }

    /**
     * @inheritdoc
     */
    public function getBaseMediaPath()
    {
        return 'media_folder_path';
    }

    /**
     * @inheritdoc
     */
    public function getBaseMediaUrl()
    {
        return $this->storeManager->getStore()
                ->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA) . 'media_folder_path';
    }

    /**
     * Filesystem directory path of temporary product images relative to the media directory.
     *
     * @return string
     */
    public function getBaseTmpMediaPath()
    {
        return 'tmp/' . $this->getBaseMediaPathAddition();
    }

    /**
     * Get temporary base media URL.
     *
     * @return string
     */
    public function getBaseTmpMediaUrl()
    {
        return $this->storeManager->getStore()->getBaseUrl(
                \Magento\Framework\UrlInterface::URL_TYPE_MEDIA
            ) . 'tmp/' . $this->getBaseMediaUrlAddition();
    }

    /**
     * @inheritdoc
     */
    public function getMediaUrl($file)
    {
        return $this->getBaseMediaUrl() . '/' . $this->_prepareFile($file);
    }

    /**
     * @inheritdoc
     */
    public function getMediaPath($file)
    {
        return $this->getBaseMediaPath() . '/' . $this->_prepareFile($file);
    }

    /**
     * Get temporary media URL.
     *
     * @param string $file
     * @return string
     */
    public function getTmpMediaUrl($file)
    {
        return $this->getBaseTmpMediaUrl() . '/' . $this->_prepareFile($file);
    }

    /**
     * Part of URL of temporary product images relative to the media directory.
     *
     * @param string $file
     * @return string
     */
    public function getTmpMediaShortUrl($file)
    {
        return 'tmp/' . $this->getBaseMediaUrlAddition() . '/' . $this->_prepareFile($file);
    }

    /**
     * Part of URL of product images relatively to media folder.
     *
     * @param string $file
     * @return string
     */
    public function getMediaShortUrl($file)
    {
        return $this->getBaseMediaUrlAddition() . '/' . $this->_prepareFile($file);
    }

    /**
     * Get path to the temporary media.
     *
     * @param string $file
     * @return string
     */
    public function getTmpMediaPath($file)
    {
        return $this->getBaseTmpMediaPath() . '/' . $this->_prepareFile($file);
    }

    /**
     * Process file path.
     *
     * @param string $file
     * @return string
     */
    protected function _prepareFile($file)
    {
        return ltrim(str_replace('\\','/',$file),'/');
    }

    /**
     * Get codes of media attribute.
     *
     * @return array
     * @since 100.0.4
     */
    public function getMediaAttributeCodes()
    {
        if (!isset($this->mediaAttributeCodes)) {
            // the in-memory object-level caching allows to prevent unnecessary calls to the DB
            $this->mediaAttributeCodes = $this->getattributeHelper()->getattributeCodesByFrontendType('media_image');
        }
        return $this->mediaAttributeCodes;
    }

    /**
     * Get attribute helper.
     *
     * @return Attribute
     */
    private function getattributeHelper()
    {
        if (null === $this->attributeHelper) {
            $this->attributeHelper = \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Eav\Model\Entity\Attribute::class);
        }
        return $this->attributeHelper;
    }
}

1. 要从您的自定义资源模型/类访问图像

$_objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$imageHelper  = $_objectManager->get('VendorName\ModuleName\Model\Image');
$image_url = $imageHelper->init($item,'custom_image')->setImageFile($image)->getUrl();

$ item将成为您的自定义资源实体

如果您有其他方法，请分享。