renderBlock() public method

$block will be injected in the selected template.
public renderBlock ( Block $block, array $parameters = [] ) : string
$block eZ\Publish\Core\FieldType\Page\Parts\Block
$parameters array Parameters to pass to the template called to render the view. By default, it's empty. 'block' entry is reserved for the Block that is viewed.
return string
 /**
  * Render the block
  *
  * @param \eZ\Publish\Core\FieldType\Page\Parts\Block $block
  * @param array $params
  * @param array $cacheSettings settings for the HTTP cache, 'smax-age' and
  *        'max-age' are checked.
  *
  * @return \Symfony\Component\HttpFoundation\Response
  */
 public function viewBlock(Block $block, array $params = array(), array $cacheSettings = array())
 {
     $response = new Response();
     if ($this->getParameter('content.view_cache') === true) {
         $response->setPublic();
         if (isset($cacheSettings['smax-age']) && is_int($cacheSettings['smax-age'])) {
             $response->setSharedMaxAge((int) $cacheSettings['smax-age']);
         }
         if (isset($cacheSettings['max-age']) && is_int($cacheSettings['max-age'])) {
             $response->setMaxAge((int) $cacheSettings['max-age']);
         }
     }
     $response->setContent($this->viewManager->renderBlock($block, $params + array('pageService' => $this->pageService, 'valid_items' => $this->pageService->getValidBlockItems($block))));
     return $response;
 }