Render.php

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<?php
namespace Magento\Ui\Controller\Index;

use Magento\Backend\App\Action\Context;
use Magento\Framework\View\Element\UiComponentFactory;
use Magento\Framework\View\Element\UiComponentInterface;

class Render extends \Magento\Framework\App\Action\Action
{
    private $context;

    private $uiComponentFactory;

    public function __construct(Context $context, UiComponentFactory $uiComponentFactory)
    {
        parent::__construct($context);
        $this->context = $context;
        $this->uiComponentFactory = $uiComponentFactory;
    }

    public function execute()
    {
        if ($this->_request->getParam('namespace') === null) {
            $this->_redirect('noroute');
            return;
        }

        $component = $this->uiComponentFactory->create($this->_request->getParam('namespace'));
        $this->prepareComponent($component);
        $this->_response->appendBody((string) $component->render());
    }

    private function prepareComponent(UiComponentInterface $component)
    {
        foreach ($component->getChildComponents() as $child) {
            $this->prepareComponent($child);
        }
        $component->prepare();
    }
}