Save content of UIWebView

I am working on an app and I need to save the content of UIWebView.

I currently Use stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName('html')[0].innerHTML" to get the html of the UIWebView, but the problem with this method is that it does not save the full content of some webpages.

So my question is How do you save the full content of a webpage including images and css

I think there is already a thread about this topic here:

iphone uiwebview download complete page with CSS and Images

Hope that helps.