如何从WKWebview移除或隐藏PDF的页面计数器？

class WebViewDelegate: NSObject, WKNavigationDelegate {
    // 实现相关方法
}

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    // 执行JavaScript代码移除或隐藏计数器
    let removeCounterScript = "document.getElementById('pageCounter').style.display = 'none';"
    webView.evaluateJavaScript(removeCounterScript, completionHandler: nil)
}

let webView = WKWebView(frame: CGRect.zero, configuration: configuration)
webView.navigationDelegate = WebViewDelegate()