how to update data to twitter from my phone app

I am creating a app that I want to have a button for the user to tell others on twitter about my APP and have them post it to their twitter account.. how can this be done im fairly new to iphone prog开发者_JAVA技巧ramming, but this will finish up my second app please help and thanks for all your advice concerning this matter.

Twitter has an API which you can use to send messages to twitter with. There API is documented here.

ShareKit has Twitter support and is fairly easy to implement.

http://www.getsharekit.com/