问题
In my application we kept option to login through gmail/facebook. I have requirement to get gmail contacts. I have seen GData library in which "GDataServiceGoogleContact" object is creating with username and password.
My requirement is if i already login with gmail(using google plus SDK),how to fetch contacts by url "https://www.google.com/m8/feeds/groups/default/full". or is there any option using iOS google plus SDK.
来源：https://stackoverflow.com/questions/26868519/fetch-google-contacts-for-ios-application-if-user-already-logged-in