如何在不加载空页的情况下清理UIWebView的内容？

I need to clean the content of UIWebView(in order to reuse it), but I have some authentication handling code in its delegate methods, so I do not want to load an empty page like about:blank to clean it, as it will trigger my authentication handling code. So is there a way for doing this? (also, by reusing it, I need to put a spinner on top of the web view, and when it loads another page, I don't want the user see the previous loaded page content, so that's why I need to clean it)I need to clean the content of UIWebView(in ord