title: UIPageView UIWebView Prefetch
body: <p>I am making an app with the UIPageViewController. Right now I just have a UIWebView in each page. Right now I run <code>[_webView loadRequest:requestObj];</code> inside viewWillAppear. It works ok but there is a lag when the page will show up as the http request is sent out right when the gesture recognizer handles the event for the page flip. </p>
  
  <p>I tried writing some code inside </p>
  
  <pre><code>- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
  </code></pre>
  
  <p>but I couldn't get it to work. </p>
  
  <p>Whats a good way to prefetch the UIWebView for next page before flipping to make the page show up instantly when page is being flipped? </p>