How to integrate Facebook in iPhone

I have integrated fbgraph api in the application and can post and update the status on facebook, however didn't know how to update status in certain time interval when the app is in background, In my application user will have options like 3 hrs,5 hrs, 6 hrs to update the status automatically, user can select the any time and when app is in background it update开发者_如何学编程s automatically, i am not getting access token in background, please help

Here the solution!

https://github.com/facebook/facebook-ios-sdk