title: UILabel sizeWithFont on AutoLayout not working
body: <p>I updating my application, to work with iPhone 6.
  But, when I switched on autolayout on XIB, label still not resizing.</p>
  
  <pre><code>CGSize expected = [[textLabel text] sizeWithFont:textLabel.font constrainedToSize:max lineBreakMode:textLabel.lineBreakMode];
  </code></pre>
  
  <p>How can I solve this?</p>