title: Is it possible to create an NSSortDescriptor for a dictionary value in an object?
body: <p>I have an object with a dictionary property. I want to sort by a value in the dictionary, lets say, </p>
  
  <pre><code>myObject.dictionary[@"sort"]
  </code></pre>
  
  <p>I have an array of these objects. Is it possible to create an NSSortDescriptor to sort by that value? Like,</p>
  
  <pre><code>[NSSortDescriptor sortDescriptorWithKey:@"dictionary['sort']" ascending:YES]
  </code></pre>