如何转发UIWebView滚动到UIScrollView？(有条件的)

webView.delegate = self
webView.scalesPageToFit = true
webView.loadRequest(URLRequest(url: URL(string: "https://www.example.com")!))

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    if scrollView == webView.scrollView {
        let offset = scrollView.contentOffset
        webView.scrollView.contentOffset = offset
    }
}

func webViewDidFinishLoad(_ webView: UIWebView) {
    webView.stringByEvaluatingJavaScript(from: "document.body.style.webkitTouchCallout='none';")
    webView.scrollView.isScrollEnabled = false
    webView.scrollView.bounces = false
}