title: iOS WatchKit - How to detect when back button is pressed on Watch?
body: <p>I need to do some cleanup on 2nd view controller when the back button (arrow) is pressed on the Apple Watch. Is there any sort of method for detecting/handling when a back button is pressed / view is popped?</p>
  
  <p>Note - I can't use 'willDeactivate()' function as it gets me stuck in a loop for what I am trying to do.</p>