Yii2 mpdf更改下载的文件名

use yii2tech\mpdf\Pdf;

public function actionGeneratePdf()
{
    $pdf = new Pdf([
        // 配置mpdf参数
    ]);

    $content = $this->renderPartial('pdf-template', [
        // 渲染PDF模板所需的数据
    ]);

    $pdf->content = $content;

    return $pdf->render();
}

use yii\web\Response;

public function actionGeneratePdf()
{
    // ...

    $response = Yii::$app->response;
    $response->format = Response::FORMAT_RAW;
    $response->headers->add('Content-Type', 'application/pdf');
    $response->headers->add('Content-Disposition', 'attachment; filename="new-file-name.pdf"');

    return $pdf->render();
}