This is a sample code of an rss reader, with offline usage, that retrieve and show the feed from the BBC technology news: http://feeds.bbci.co.uk/news/technology/rss.xml
The main design pattern for this application is the MVC, there are also a façade class (RSSAPI) and a singleton class (RSSDownloader), just to make an example. the RSSAPI send messages to the tableview using pushNotification; the RSSAPI's subclasses send a message to the parent class using delegation.
For more detailed description of each class please read the comments on the header files.
Thanks for your time. Best regards, Alberto