webViewDidFinishLoad in WKWebView
<p>I have to migrate from UIWebView to WKWebView and I'm having some trouble with this. It looks like that "WKWebView" has no member 'request'. Is there a way to handle this situation using the WKWebView? I simply need to get the URL loaded and then if it contains ".pdf" just show a button.</p>

<pre><code>func webViewDidFinishLoad(_ webView : WKWebView) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false

    if (webView.request?.url!.absoluteString)!.range(of: ".pdf") != nil {
        pdfBackButton.isHidden = false
    }
    else {
    pdfBackButton.isHidden = true}

}
</code></pre>