Magento2 系统配置中的Magento 2类别选择器

如何在magento 2中的系统配置中获取类别选择器

我需要得到所有级别的类别在管理配置部分作为多选选项。我已经添加了以下代码，并得到了预期的结果。但我想用递归函数来实现。请帮我做同样的事

namespace Vendor\Productslider\Model\Config\Source;

use Magento\Framework\Option\ArrayInterface;
use Magento\Catalog\Helper\Category;

class Categorylist implements ArrayInterface
{
    protected $_categoryHelper;
    protected $categoryRepository;

    public function __construct(
        \Magento\Catalog\Helper\Category $catalogCategory,
        \Magento\Catalog\Model\CategoryRepository $categoryRepository
        )
    {
        $this->_categoryHelper = $catalogCategory;
        $this->categoryRepository = $categoryRepository;
    }

    /*
     * Return categories helper
     */

    public function getStoreCategories($sorted = false, $asCollection = false, $toLoad = true)
    {
        return $this->_categoryHelper->getStoreCategories($sorted , $asCollection, $toLoad);
    }

    /*  
     * Option getter
     * @return array
     */
    public function toOptionArray()
    {


        $arr = $this->toArray();
        $ret = [];

        foreach ($arr as $key => $value)
        {

            $ret[] = [
                'value' => $key,
                'label' => $value
            ];
        }

        return $ret;
    }

    /*
     * Get options in "key-value" format
     * @return array
     */
    public function toArray()
    {

        $categories = $this->getStoreCategories(true,false,true);
        $categoryList = $this->renderCategories($categories);
        return $categoryList;
    }

    public function renderCategories($_categories)
    {
        $categoryList = array();
        foreach ($_categories as $category){
            $categoryList[$category->getEntityId()] = __($category->getName()); // Main categories

            $categoryObj = $this->categoryRepository->get($category->getId());
            $subcategories = $categoryObj->getChildrenCategories();
            foreach($subcategories as $subcategory) {
                $categoryList[$subcategory->getEntityId()] = __('--'.$subcategory->getName());  // 1st level Sub categories

                if($subcategory->hasChildren()) {
                    $childCategoryObj = $this->categoryRepository->get($subcategory->getId());
                    $childSubcategories = $childCategoryObj->getChildrenCategories();
                    foreach($childSubcategories as $childSubcategory) {
                        $categoryList[$childSubcategory->getEntityId()] = __('----'.$childSubcategory->getName());  // 2nd level Sub categories
                    }
                }
            }
        }

        return $categoryList;       
    }

}

感谢上帝！！ 我已经找到了解决办法

namespace Vendor\Productslider\Model\Config\Source;

use Magento\Framework\Option\ArrayInterface;
use Magento\Catalog\Helper\Category;

class Categorylist implements ArrayInterface
{
    protected $_categoryHelper;
    protected $categoryRepository;
    protected $categoryList;

    public function __construct(
        \Magento\Catalog\Helper\Category $catalogCategory,
        \Magento\Catalog\Model\CategoryRepository $categoryRepository
        )
    {
        $this->_categoryHelper = $catalogCategory;
        $this->categoryRepository = $categoryRepository;
    }

    /*
     * Return categories helper
     */

    public function getStoreCategories($sorted = false, $asCollection = false, $toLoad = true)
    {
        return $this->_categoryHelper->getStoreCategories($sorted , $asCollection, $toLoad);
    }

    /*  
     * Option getter
     * @return array
     */
    public function toOptionArray()
    {


        $arr = $this->toArray();
        $ret = [];

        foreach ($arr as $key => $value)
        {

            $ret[] = [
                'value' => $key,
                'label' => $value
            ];
        }

        return $ret;
    }

    /*
     * Get options in "key-value" format
     * @return array
     */
    public function toArray()
    {

        $categories = $this->getStoreCategories(true,false,true);
        $categoryList = $this->renderCategories($categories);
        return $categoryList;
    }

    public function renderCategories($_categories)
    {
        foreach ($_categories as $category){
            $i = 0; 
            $this->categoryList[$category->getEntityId()] = __($category->getName());   // Main categories
            $list = $this->renderSubCat($category,$i);
        }

        return $this->categoryList;     
    }

    public function renderSubCat($cat,$j){

        $categoryObj = $this->categoryRepository->get($cat->getId());

        $level = $categoryObj->getLevel();
        $arrow = str_repeat("---", $level-1);
        $subcategories = $categoryObj->getChildrenCategories(); 

        foreach($subcategories as $subcategory) {
            $this->categoryList[$subcategory->getEntityId()] = __($arrow.$subcategory->getName()); 

            if($subcategory->hasChildren()) {

                $this->renderSubCat($subcategory,$j);

            }
        } 

        return $this->categoryList;
    }
}