google api - Retrieve User email using GTM OAuth2 for iOS -

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i have implemented authentication using gtm oauth 2 library. want have email id of user. how should proceed. know have call in here :-

- (void)viewcontroller:(gtmoauth2viewcontrollertouch *)viewcontroller   finishedwithauth:(gtmoauth2authentication *)auth              error:(nserror *)error { if (error != nil) {      nslog(@"sign in error : %@", error.description);     // authentication failed } else {     // authentication succeeded }

}

when signing in google services gtm-oauth2, user's email address available after sign-in in auth object's useremail property.


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