title: Check if UIView is displaying a UIAlertView
body: <p>Is it possible to determine if the current UIView has a UIAlertView on display (other than setting a variable every time a UIAlertView is created). </p>
  
  <p>I'm thinking something along the lines of </p>
  
  <pre><code>    if ([self.view.subviews containsObject:UIAlertView]) { ... }
  </code></pre>
  
  <p>But that obviously doesn't work.</p>