title: How can I capitalize all letters in an NSString?
body: <p>I'm trying to capitalize all letters in a <code>NSString</code> for a table cell label.</p>
  <p>Here's my code:</p>
  <pre><code>  // cell title and subtitle
  cell.nameLabel.text = listingNode.title;
  [cell.nameLabel.text uppercaseString];
  </code></pre>
  <p>It doesn't seem to have any effect at all.</p>