[iOS] WebView doesn't allow reading local file without current directory

void QDarwinWebViewPrivate::setUrl(const QUrl &url)
{
    if (url.isValid()) {
        if (url.isLocalFile()) {
            // We need to pass local files via loadFileURL and the read access should cover
            // the directory that the file is in, to facilitate loading referenced images etc
            [wkWebView loadFileURL:url.toNSURL()
           allowingReadAccessToURL:QUrl(url.toString(QUrl::RemoveFilename)).toNSURL()];
        } else {
            [wkWebView loadRequest:[NSURLRequest requestWithURL:url.toNSURL()]];