Zend Framework:如何故意抛出404错误？

use Zend\Http\Response;
use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\ViewModel;

class IndexController extends AbstractActionController
{
    public function indexAction()
    {
        // 模拟条件，当满足某个条件时抛出 404 错误
        $condition = true;
        
        if ($condition) {
            $response = $this->getResponse();
            $response->setStatusCode(Response::STATUS_CODE_404);
            
            // 可选：自定义 404 页面
            $viewModel = new ViewModel();
            $viewModel->setTemplate('error/404');
            
            return $viewModel;
        }
        
        // 正常处理逻辑
        // ...
    }
}