title: No visible interface for selector - for IBOutlet
body: <p>That's a weird one:</p>
  
  <ul>
  <li>I'm using a <a href="https://github.com/malcommac/DMSplitView" rel="nofollow">DMSplitView</a> instance</li>
  <li>Dragging it to my <code>AppDelegate.h</code> which creates an outlet like <code>@property (weak) IBOutlet DMSplitView *verticalSplit;
  </code></li>
  </ul>
  
  <p>However, whenever I'm trying to access it, in my <code>AppDelegate.m</code>, I'm getting an error:</p>
  
  <p><code>No visible @interface for 'AppDelegate' declares the selector verticalSplit</code></p>
  
  <p>How is that possible? I've done that like 10,000 times before. What sort of bug is that? Any ideas?</p>
  
  <hr>
  
  <p><strong>P.S.</strong>  Just tried it as an experiment, and it's official: I cannot add <em>any</em> outlet whatsoever. :S</p>