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copied!<p>If you make your view controller implement the <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/NSXMLParserDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intf/NSXMLParserDelegate" rel="nofollow noreferrer"><code>NSXMLParserDelegate</code></a> protocol, and set the <code>NSXMLParser</code> instance's delegate property to your view controller, your view controller will know when the parser <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/NSXMLParserDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSXMLParserDelegate/parser:didEndElement:namespaceURI:qualifiedName:" rel="nofollow noreferrer">parses stuff</a> and <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Reference/NSXMLParserDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSXMLParserDelegate/parserDidEndDocument:" rel="nofollow noreferrer">finishes its work</a>. In other words, the view controller can consume a populated data model, once the parser subclass tells the delegate it is done.</p> <p>As an aside, <a href="http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhone101/Articles/01_Overview.html#//apple_ref/doc/uid/TP40007514-CH10-SW5" rel="nofollow noreferrer">delegation</a> is one of a few design patterns that OS X applications (and, specifically, Apple APIs) make heavy use of. As you do iPhone development, you'll likely find and make use of delegates everywhere.</p> <p>If you don't want to use delegates, another option is to implement an observer pattern, issuing <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSNotification_Class/Reference/Reference.html" rel="nofollow noreferrer">notifications</a> from the <code>NSNotificationCenter</code> to observers, which call their selectors (methods) when they hear a notification. The advantage of notifications over delegates is that you can have lots of objects listen for notifications, whereas only one object can generally be a delegate at a given time.</p>

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