title: Passing data back from a modal view in WatchKit
body: <p>When modally presenting, or pushing, an interface controller we can specify the <code>context</code> parameter to pass some data to the new controller as follows.</p>
  
  <pre><code>// Push
  [self pushControllerWithName:@"MyController" context:[NSDictionary dictionaryWithObjectsAndKeys:someObject, @"someKey", ..., nil]]; 
  
  // Modal
  [self presentControllerWithName:@"MyController" context:[NSDictionary dictionaryWithObjectsAndKeys:someObject, @"someKey", ..., nil]]; 
  </code></pre>
  
  <p>My question is, how can we do the reverse? </p>
  
  <p>Say we present a controller modally for the user to pick an item from a list and we return to the main controller, how can we get the item that has been picked?</p>