How to integrate Google credentials in an iPhone application?

I want to make my application to run using Google credentials.

I'm doing an application where user can get his list of events from the server by giving local credentials. I want to make my application r开发者_StackOverflowun when the user enters Google credentials. How can integrate that to my application.

You can give a try on Google Data objective C API.. Which handles all google service. i guess you can handle google credentials here..