title: Send notification to another view controller when request finishes
body: <p>I am working on an Iphone Application (ios5 + storyboard + arc).
  I have 2 ViewControllers A and B. </p>
  
  <p>In A I have a button. when pressed I am submitting a request asynchronously to the server (using AFNetworking) and I will go to View Controller B by using performSegueWithIdentifier (push not modal).</p>
  
  <p>When the request finishes it executes a request successful Block that will save data to the database. (The block is in ViewController A since the request is sent from there)</p>
  
  <p>Is there a way I can notify ViewController B that the request has finished and execute a method in B?</p>
  
  <p>What I'm looking for is that when the request finishes and enters the Success Block I run a method in view controller B which is the loaded view.</p>
  
  <p>I hope I was clear.</p>
  
  <p>Thanks</p>