Symfony - Phpspreadsheet exportar excel

//Metodo para generar un pdf, el CSS lo añadimos en el template

/**

 * @Route("/generarpdf", name="electronica_generapdf")

 */

public function generarPdf()

{

    $pdfOptions = new Options();

    $pdfOptions->set('defaultFont', 'Arial');

    $pdfOptions->setIsRemoteEnabled(true);

    $dompdf = new Dompdf($pdfOptions);

    $context = stream_context_create([

        'ssl' => [

            'verify_peer' => FALSE,

            'verify_peer_name' => FALSE,

            'allow_self_signed' => TRUE

        ]

    ]);

    $dompdf->setHttpContext($context);

    $electronicas = $this->getDoctrine()

        ->getRepository(Electronica::class)

        ->findAll();

    $html = $this->renderView('electronica/listaelec.html.twig', [

        'electronicas' => $electronicas,

    ]);

    $dompdf->loadHtml($html);

    $dompdf->setPaper('A4', 'landscape');

    $dompdf->render();

    $fichier = 'SolicitudesElectronica.pdf';

    $dompdf->stream($fichier, [

        'Attachment' => true

    ]);

    return new Response();

}

//Metodo para generar excel

/**

 * @Route("/exportarexcel",  name="electronica_exportarexcel")

 */

public function exportarexcel()

{

    $spreadsheet = new Spreadsheet();

    /* @var $sheet \PhpOffice\PhpSpreadsheet\Writer\Xlsx\Worksheet */

    $sheet = $spreadsheet->getActiveSheet();

    $sheet->setCellValue('A1', 'ID');

    $sheet->setCellValue('B1', 'num_pedido');

    $sheet->setCellValue('C1', 'Cliente');

    $sheet->setCellValue('D1', 'Vehiculo');

    $sheet->setCellValue('E1', 'Kilometros');

    $sheet->setCellValue('F1', 'Matrícula');

    $sheet->setCellValue('G1', 'Motor');

    $sheet->setCellValue('H1', 'Potencia');

    $sheet->setCellValue('I1', 'Cantidad');

    $sheet->setCellValue('J1', 'Sintomas');

    $sheet->setCellValue('K1', 'Alquiler');

    $sheet->setCellValue('L1', 'Presupuesto');

    $sheet->setCellValue('M1', 'Garantia');

    $sheet->setCellValue('N1', 'Reparación');

    $sheet->setCellValue('O1', 'Alquiler');

    $sheet->setCellValue('P1', 'Fecha');

    $sheet->setCellValue('Q1', 'Estado');

    $electronicas = $this->getDoctrine()

        ->getRepository(Electronica::class)

        ->findAll();

    $sheet = $spreadsheet->getActiveSheet();

    $sheet->setCellValue('A2', $electronicas);

    $sheet->setTitle("Solicitudes Electrónicas");

    // Create your Office 2007 Excel (XLSX Format)

    $writer = new Xlsx($spreadsheet);

    // Create a Temporary file in the system

    $fileName = 'HistóricoSolicitudesElectrónicas.xlsx';

    $temp_file = tempnam(sys_get_temp_dir(), $fileName);

    // Create the excel file in the tmp directory of the system

    $writer->save($temp_file);

    // Return the excel file as an attachment

    return $this->file($temp_file, $fileName, ResponseHeaderBag::DISPOSITION_INLINE);

}