title: get sender of segue in destination view controller
body: <p>I have a VC named Dashboard (D) which can open a VC named Login (L) and a VC named Register (R). Login can open VC Register too.</p>
  
  <p>I try to use storyboard as often as possible, so I have created with it three Segues, D to L, D to R, L to R</p>
  
  <p>So, in case of D -> L -> R and in case of D -> R, when I close R, I have to close L if it necessary and inform D which he can begin to load the user infos (launch function in nutshell).</p>
  
  <p>So, I would like get the sender of Segue in destination vc, knowing that I put it in sender entrie of performSegueWithIdentifier like that :</p>
  
  <pre><code>[self performSegueWithIdentifier:@"SegueToFbRegister" sender:self];
  </code></pre>