将图标粘贴到视图中无济于事（或某些错误信息）。在注册砖并检查AbstractTemplateAreabrick的方法时，您会注意到它具有某个类getIcon()。这是您要设置自定义图标时必须重写的方法。

AreabrickInterface定义了这样的方法：

/**
 * Icon as absolute path,e.g. /bundles/websitedemo/img/areas/foo/icon.png
 *
 * @return string|null
 */
public function getIcon();

需要一个绝对的图像URL。就我而言，我只是使用base64 .svgs进行操作-这是一个有效的示例：

class Accordion extends AbstractAreabrick
{
    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return $this->translator->trans('Accordion');
    }

    /**
     * {@inheritdoc}
     */
    public function getDescription()
    {
        return $this->translator->trans('for collapsed contents');
    }

    public function getIcon() {
        return "data:image/svg+xml;base64,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";
    }
}