How do I use a UIViewController as a dialog?
<p>I have a UIViewController that I want to display a second UIViewController as a dialog.  Basically, the user presses a button in the first controller, then the second controller pops up and the user makes a selection.</p>

<p>When the user presses Save in the second controller, how does control get passed back to the parent controller, and how can I extract the user's choice from the second controller?</p>
