title: How to refresh UIViewController view on click of some buttons
body: <p>I'm developing an iPhone app, i have a UINavigationControlller in my AppDelegate.i have refresh button on other view.Button have an IBAction method on clicking a button. i am using this code</p>
  
  <pre><code> [AppDelegate.navigationController.topViewController.view setNeedsDisplay];
  </code></pre>
  
  <p>My problem is how can i refresh my page(reload) on click of these button,setNeedsDisplay method not called view life cycle methods eg. viewDidLoad,viewWillAppear</p>
  
  <p>Am I doing it correct or is there a way of doing what I do?</p>
  
  <p>thanks in Advance.</p>