title: Invoke a method from a different view controller. iPhone SDK
body: <p>So I have an application with two view controllers one is the main controller that launches when the app launches. This view controller Has two buttons on opens a uiwebview to google.com the other opens that same uiwebview but loads a different page. 
  How can I change the nsurl that is loaded in the other view controller from the original view controller. </p>