title: UITextView sizeThatFits returns different size than boundingRectWithSize
body: <p>Need the required height of <code>UITextView</code>. <code>sizeThatFits</code> returns bigger, but the correct height than <code>boundingRectWithSize</code>. Why difference exist?</p>
  
  <p>At two places I need to know the height. In <code>cellForRowAtIndexPath</code> and in <code>heightForRowAtIndexPath</code>. </p>
  
  <p>I do not think it is efficient to create always a <code>UITextView</code> in <code>heightForRowAtIndexPath</code> just to know what height is required.</p>
  
  <p>What workaround do you know to calculate height of a <code>UITextView</code> in <code>heightForRowAtIndexPath</code>?</p>