title: How do I superscript characters in a UIButton?
body: <p>I have a UIButton set up in the Nib file of my iOS app. I want to set the text of the button to an equation:</p>
  
  <pre><code>myUIButton.text = @"x^3 + x^2 + x^1 + k";
  </code></pre>
  
  <p>It would be really nice to allow for superscripts. How can I do that? Should I consider adding to the unicode values for the powers to obtain the respective superscript characters?</p>