/** * Batch print shipping labels for whole shipments. * Push pdf document with shipping labels to user browser * * @param AbstractCollection $collection * @return ResponseInterface|ResultInterface */ protected function massAction(AbstractCollection $collection) { $labelsContent = []; if ($collection->getSize()) { /** @var \Magento\Sales\Model\Order\Shipment $shipment */ foreach ($collection as $shipment) { $labelContent = $shipment->getShippingLabel(); if ($labelContent) { $labelsContent[] = $labelContent; } } } if (!empty($labelsContent)) { $outputPdf = $this->labelGenerator->combineLabelsPdf($labelsContent); return $this->fileFactory->create('ShippingLabels.pdf', $outputPdf->render(), DirectoryList::VAR_DIR, 'application/pdf'); } $this->messageManager->addError(__('There are no shipping labels related to selected shipments.')); return $this->resultRedirectFactory->create()->setPath('sales/shipment/'); }