title: UIWebView didn't quite finish loading
body: <p>I have pushed a view onto my nav controller that contains a UIWebView and this will load a URL.</p>
  
  <p>When it starts I kick off the networkActivityIndicatorVisible and when it finishes I hide it.  </p>
  
  <p>If a user decides he does not want to finish loading the web page and hits back on the navcontroller the network indicator carries on.  How do I get rid of this as there appears to be no delegate method for this and none of the viewdidUnload get triggered....</p>