title: UITextView content size different in iOS7
body: <p>I am using an <code>UITextView</code> that will be expandable by taping a "more" button. The problem is the following:</p>
  
  <p>On iOS6  I use this,</p>
  
  <pre><code>self.DescriptionTextView.text =  @"loong string";
  
  if(self.DescriptionTextView.contentSize.height&gt;self.DescriptionTextView.frame.size.height) { 
      //set up the more button
  }
  </code></pre>
  
  <p>The problem is that on iOS7 the <code>contentSize.height</code> returns a different value (far smaller) than the value it returns on iOS6. 
  Why is this? How to fix it?</p>