title: Best way to split and convert url params into string values
body: <p>I would like to split a custom url for app opening in iPhone into values, my scheme would be something like:</p>
  
  <pre><code>appname://user=jonsmith&amp;message=blah%20blah
  </code></pre>
  
  <p>Where I would like to be able to get "user" and "message" as two NSStrings. Any advice on best approach?</p>