title: Getting the actual height of a UITextView
body: <p>I have a NSAttributedString being passed into a UITextView:</p>
  
  <pre><code>NSAttributedString *str = @"A really long string ... that continues for awhile";
  </code></pre>
  
  <p>The string is random in length and I want to pass it into a UITextView.</p>
  
  <pre><code>myTextView.attributedText = str;
  </code></pre>
  
  <p>I need the width of the UITextView to be 300 but how do I find the heigt?</p>