title: Correct way to add a sound to UIAlertView
body: <p>What is the most correct way to add a sound to a UIAlertView?</p>
  
  <p>Should I subclass it and then play a system sound when the view appears?</p>
  
  <p>Or would it be more correct, not to subclass but instead call a separate method to play a sound when it appears?</p>
  
  <p>Can anyone recommend a control that plays sound and looks prettier than UIAlertView?</p>