Magento2 更改getPdf函数

我正在尝试更改

getPdf

函数，将orderid发送到

\u Addfooter

以获取最终税额。我创建了一个模块，并按原样添加了函数，以查看它是否正常工作，但当我尝试生成发票时，我发现了以下错误。我在模块中添加了

\u drawTotal

函数，但另一个函数开始出错。我不想在我的模块中复制整个文件

Invalid method Vendor\InvoicePdf\Model\Order\Pdf\Invoice::_drawTotal

我是Magento2和PHP的新手。理想情况下，我尝试删除每个项目的税列，然后在注释部分，我尝试添加总税值

下面是我的模块代码，请让我知道我遗漏了什么

<?php

namespace Vendor\InvoicePdf\Model\Order\Pdf;

 use Magento\Sales\Model\ResourceModel\Order\Invoice\Collection;

 class Invoice extends \Magento\Sales\Model\Order\Pdf\Invoice
{
protected function _drawHeader(\Zend_Pdf_Page $page)
{
    /* Add table head */
    $this->_setFontRegular($page, 10);
    $page->setFillColor(new \Zend_Pdf_Color_Rgb(0.93, 0.92, 0.92));
    $page->setLineColor(new \Zend_Pdf_Color_GrayScale(0.5));
    $page->setLineWidth(0.5);
    $page->drawRectangle(25, $this->y, 570, $this->y - 15);
    $this->y -= 10;
    $page->setFillColor(new \Zend_Pdf_Color_Rgb(0, 0, 0));

    //columns headers
    $lines[0][] = ['text' => __('Products'), 'feed' => 35];

    $lines[0][] = ['text' => __('SKU'), 'feed' => 290, 'align' => 'right'];

    $lines[0][] = ['text' => __('Qty'), 'feed' => 435, 'align' => 'right'];

    $lines[0][] = ['text' => __('Price'), 'feed' => 360, 'align' => 'right'];

    /*$lines[0][] = ['text' => __('Tax'), 'feed' => 495, 'align' => 'right'];*/

    $lines[0][] = ['text' => __('Subtotal'), 'feed' => 565, 'align' => 'right'];

    $lineBlock = ['lines' => $lines, 'height' => 5];

    $this->drawLineBlocks($page, [$lineBlock], ['table_header' => true]);
    $page->setFillColor(new \Zend_Pdf_Color_GrayScale(0));
    $this->y -= 20;
  }

   /**
     * Return PDF document
     *
     * @param array|Collection $invoices
     * @return \Zend_Pdf
     */
    public function getPdf($invoices = [])
    {
        $this->_beforeGetPdf();
        $this->_initRenderer('invoice');

        $pdf = new \Zend_Pdf();
        $this->_setPdf($pdf);
        $style = new \Zend_Pdf_Style();
        $this->_setFontBold($style, 10);

        foreach ($invoices as $invoice) {
            if ($invoice->getStoreId()) {
                $this->_localeResolver->emulate($invoice->getStoreId());
                $this->_storeManager->setCurrentStore($invoice->getStoreId());
            }
            $page = $this->newPage();
            $order = $invoice->getOrder();
            
            $_SESSION['orderid'] = $order->getRealOrderId();
            /* Add image */
            $this->insertLogo($page, $invoice->getStore());
            /* Add address */
            $this->insertAddress($page, $invoice->getStore());
            /* Add head */
            $this->insertOrder(
                $page,
                $order,
                $this->_scopeConfig->isSetFlag(
                    self::XML_PATH_SALES_PDF_INVOICE_PUT_ORDER_ID,
                    \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
                    $order->getStoreId()
                )
            );
            /* Add document text and number */
            $this->insertDocumentNumber($page, __('Invoice # ') . $invoice->getIncrementId());
            /* Add table */
            $this->_drawHeader($page);
            /* Add body */
            foreach ($invoice->getAllItems() as $item) {
                if ($item->getOrderItem()->getParentItem()) {
                    continue;
                }
                /* Draw item */
                $this->_drawItem($item, $page, $order);
                $page = end($pdf->pages);
            }
            /* Add totals */
            $this->_drawTotal($page);
            $this->insertTotals($page, $invoice);
            if ($invoice->getStoreId()) {
                $this->_localeResolver->revert();
            }
        }
        
            $this->_Addfooter($page,$this->getOrderNote($order));

        $this->_afterGetPdf();
        return $pdf;
    }
    
  /**
     * Set font as regular
     *
     * @param \Zend_Pdf_Page $object
     * @param int $size
     * @return \Zend_Pdf_Resource_Font
     */
    protected function _setFontRegular($object, $size = 7)
    {
        $font = \Zend_Pdf_Font::fontWithPath(
            $this->_rootDirectory->getAbsolutePath('lib/internal/Font/DejaVuSans.ttf')
        );
        $object->setFont($font, $size);
        return $font;
    }

    /**
     * Set font as bold
     *
     * @param \Zend_Pdf_Page $object
     * @param int $size
     * @return \Zend_Pdf_Resource_Font
     */
    protected function _setFontBold($object, $size = 7)
    {
        $font = \Zend_Pdf_Font::fontWithPath(
            $this->_rootDirectory->getAbsolutePath('lib/internal/Font/DejaVuSansCondensed-Bold.ttf')
        );
        $object->setFont($font, $size);
        return $font;
    }

    /**
     * Set font as italic
     *
     * @param \Zend_Pdf_Page $object
     * @param int $size
     * @return \Zend_Pdf_Resource_Font
     */
    protected function _setFontItalic($object, $size = 7)
    {
        $font = \Zend_Pdf_Font::fontWithPath(
            $this->_rootDirectory->getAbsolutePath('lib/internal/Font/DejaVuSansCondensed-Oblique.ttf')
        );
        $object->setFont($font, $size);
        return $font;
    }
}

---

您的drawTotal函数定义在哪里？它存在于原始类中。在我的模块中，我扩展了该类，因此它应该将该函数从基函数中带出来。您使用的是哪个Magento版本？因为我已经检查过了，没有名为_drawTotal的函数。感谢James检查，我们有magento 2.2.6。如果默认情况下该函数不存在，那么我相信这是之前的开发人员对原始模块进行的黑客攻击：-(