title: iOS 8 sizeThatFits for UITextView text not returning correct height (AutoLayout)
body: <p>I'm trying to vertically center a UITextView using the appropriate height retrieved from <code>sizeThatFits</code>. There are a plethora of other answers that suggest this is the most appropriate way of calculating this.</p>
  
  <p>(Note that I've tried it both with plain and attributed strings, and both exert the same behavior).</p>
  
  <p>No matter what I try (even using attributed strings and setting the font size or line height to something bigger or smaller) it always only shows a certain truncated number of characters of text (in this case, 3 lines, and it's always exactly the same). What am I missing?</p>
  
  <pre><code>_textView.text = [_collectionDescription lowercaseString];
  _textView.font = [UIFont fontLight:22];
  _textView.textColor = [UIColor whiteColor];
  _textView.textAlignment = NSTextAlignmentCenter;
  _constraintTextViewHeight.constant = ceilf([_textView sizeThatFits:CGSizeMake(_textView.frame.size.width, FLT_MAX)].height);
  
  [_textView setNeedsDisplay];
  [_textView updateConstraints];
  </code></pre>