title: My view controller file is too long, how to put some functions in a separate swift file
body: <p>I have PlayViewController.swift and it has simply gotten too long.
  I added a new swift file "Options.swift" and cut-pasted some of the functions from PlayViewController.swift to the Options.swift</p>
  
  <p>Now when I run the project, it give 'Use of unresolved identifier ' error on function calls</p>
  
  <p>Also any calls to ui items in playcontroller with with self. give 'use of unresolved identifier 'self'</p>
  
  <p>what am i missing?</p>