title: how does one check if UIWebView is empty or not
body: <p>I need to check if a webview when completed loading has any content or not.</p>
  
  <p>What I require is simple. Its a small webview strip at the bottom of my pages (like an advert)</p>
  
  <p>I call</p>
  
  <pre><code>NSURLRequest *request=[NSURLRequest requestWithURL:adURL];
  [gWebView loadRequest:request];
  </code></pre>
  
  <p>I get the callback </p>
  
  <pre><code>-(void)webViewDidFinishLoad:(UIWebView *)webView {
  </code></pre>
  
  <p>But in my scenario the webview shall return empty and sometime it shall have data.</p>
  
  <p>I do not want to show the webview if my server php file returned nothing.</p>
  
  <p>How can I verify that I received an empty page in the callback (or any other way)?</p>