title: Top-aligning text of different sizes within a UILabel
body: <p>How to top-align text of different sizes within a UILabel? An example is top-aligning smaller-sized cent amount with larger-sized dollar amount in price banners.</p>
  
  <p><img src="https://imgur.com/fCJQUMl.jpg?1" alt="Sample Image"></p>
  
  <p>UILabel in iOS6 supports <code>NSAttributedString</code>which allows me to have text of different sizes in the same UILabel. However it doesn't seem to have an attribute for top-aligning text. What are the options to implement this? It seems to me that providing a custom drawing logic to do top-alignment based on a custom attributed string key might be best but I have no idea how to go about it.</p>