title: Sending data with Segue with Swift
body: <p>I have two view controllers and two views.
  In my first view, I set the variable 'currentUser' to false.
  I need to be able to set 'currentUser' to true in the second view controller.</p>
  
  <p>When trying to reference 'currentUser' from the second view it's not picking it up as 'currentUser' is defined in the first view controller.</p>
  
  <p>How do I carry across variables with segue?</p>