UIWebView 加载本地的 HTML 时，HTML 中的锚点是无效的，需要特殊处理，可以通过 JavaScript 来实现。

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func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
    let urlString = request.url!.absoluteString
    let anchor = urlString.suffix(from: urlString.range(of: "#")!.upperBound)
    let jsString = "document.getElementById('\(anchor)').scrollIntoView()"
    webView.stringByEvaluatingJavaScript(from: jsString)
    return false
}

参考