TCPDF页脚字体问题

I am able to change fonts in TCPDF such as using:

$pdf->SetFont('aefurat', '', 12);

The default line for footer is:

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

So I tried using something like

$pdf->setFooterFont(Array('dejavusans', '', PDF_FONT_SIZE_DATA));

but no good as the footer fonts simply does not change nor if I change the size too. Am I missing something?

My bad, just need to override the default

public function Footer() {
}

Also there was setFont line that was also overriding the

$pdf->setFooterFont(Array('dejavusans', '', PDF_FONT_SIZE_DATA));