title: Bool is not convertible to ObjCBool
body: <p>I'm getting this error doing : </p>
  
  <pre><code>return (index == self.pagesTitles.count || index == NSNotFound) ? nil : viewControllerAtIndex(++index)
  </code></pre>
  
  <p><strong>Bool is not convertible to ObjCBool</strong></p>
  
  <p>I wanted to do a ternary operator for simplify the thing. Is there something wrong ?</p>