title: Unwind segue - only instance methods can be declared @IBAction; and button does not connect to Exit
body: <p>I've much the same problem as in <a href="https://stackoverflow.com/questions/24029586/xcode-6-storyboard-unwind-segue-with-swift-not-connecting-to-exit">this question</a> but these solutions don't work. Currently running xcode 7.3.1.</p>
  
  <p>I've a split view controller app, that modally presents a save record view controller. On the save VC, there are a save and cancel button that should (in both cases) unwind back to the master view.</p>
  
  <p>Within the Master View Controller, I have the following code:</p>
  
  <pre><code>@IBAction func unwindToSegue (segue: UIStoryboardSegue) { }
  </code></pre>
  
  <p>BUT, there's a compiler error: Only instance methods can be declared @IBAction. There is the suggestion to delete @IBAction, but while this removes the error I can't connect to this action in the child VC.</p>
  
  <p>With or without @IBAction in the unwind method, I get the same issue described in the referenced problem - dragging a line from my UIButton to the Exit button in Storyboard IB, does not show any action to connect with.</p>