TCPDF表头覆盖页面头Codeigniter

Question

我在代码点火器中使用TCPDF库创建PDF文件，问题是表标题与页面标题重叠。任何帮助，将不胜感激。这是我的代码。

    $pdfdata = $this->load->view('back/invoice_pdf', $this->page_data, TRUE);

    $this->load->library("Pdf");
    $pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
    $pdf->SetCreator(PDF_CREATOR);
    $pdf->SetAuthor('NHA MTR');
    $pdf->SetTitle('NHA Monthly Traffic Report');
    $pdf->SetSubject('MTR');
    $pdf->SetKeywords('MTR, PDF');

    $pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
    $pdf->setFooterFont(Array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));

    // set default monospaced font
    $pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);

    // set margins
    $pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
    $pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
    $pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
    $pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
    $pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
    if (@file_exists(dirname(__FILE__) . '/lang/eng.php')) {
        require_once(dirname(__FILE__) . '/lang/eng.php');
        $pdf->setLanguageArray($l);
    }
    $pdf->setFontSubsetting(true);
    $pdf->SetFont('times', '', 16, '', true);
    $pdf->AddPage('L', 'A4');
    $pdf->setTextShadow(array('enabled' => true, 'depth_w' => 0.2, 'depth_h' => 0.2, 'color' => array(196, 196, 196), 'opacity' => 1, 'blend_mode' => 'Normal'));
    $pdf->writeHTMLCell(0, 0, '', '', $pdfdata, 0, 1, 0, true, '', true);
     $pdf->Output('mtr.pdf','I');
    //$pdf->Output(SERVER_RELATIVE_PATH . '/uploads/invoices/invoice' . $invoice_name . '.pdf', 'F');