你如何从iPhone应用程序使用OAuth到Twitter？

I'm looking for a simple example of how to send a Tweet from an iphone app. I've seen some very complex methods, but it can't be that difficult. I have registered the app with twitter, so I have the key & secret. Just need to know where to put these so I can send a status update and have it say "sent from MyApp".I'm looking for a simple example of how to send