Using Google+ iOS API how to get logged in user's profile details?

Question

I've managed to successfully log in to google plus from an iPhone app. But how to get logged in user's details? such as profile id, email etc.

I tried this, Stackoverflow answer for a similar question but I was unable to get it working. In that sample what exactly is being passed to accessTocken here,

NSString *str =  [NSString stringWithFormat:@"https://www.googleapis.com/oauth2/v1/userinfo?access_token=%@",accessTocken];

I've implemented that code in - (void)finishedWithAuth: (GTMOAuth2Authentication *)auth error: (NSError *) error { } method. however auth.accessToken returns a null value.

so I can not use auth.accessToken to append that URL. Is there any other way to get this done?

Answer 1

- (void)finishedWithAuth:(GTMOAuth2Authentication *)auth error:(NSError *)error {
    NSLog(@"Received Error %@ and auth object==%@", error, auth);

    if (error) {
        // Do some error handling here.
    } else {
        [self refreshInterfaceBasedOnSignIn];

        GTLQueryPlus *query = [GTLQueryPlus queryForPeopleGetWithUserId:@"me"];

        NSLog(@"email %@ ", [NSString stringWithFormat:@"Email: %@",[GPPSignIn sharedInstance].authentication.userEmail]);
        NSLog(@"Received error %@ and auth object %@",error, auth);

        // 1. Create a |GTLServicePlus| instance to send a request to Google+.
        GTLServicePlus* plusService = [[GTLServicePlus alloc] init] ;
        plusService.retryEnabled = YES;

        // 2. Set a valid |GTMOAuth2Authentication| object as the authorizer.
        [plusService setAuthorizer:[GPPSignIn sharedInstance].authentication];

        // 3. Use the "v1" version of the Google+ API.*
        plusService.apiVersion = @"v1";
        [plusService executeQuery:query
                completionHandler:^(GTLServiceTicket *ticket,
                                    GTLPlusPerson *person,
                                    NSError *error) {
            if (error) {
                //Handle Error
            } else {
                NSLog(@"Email= %@", [GPPSignIn sharedInstance].authentication.userEmail);
                NSLog(@"GoogleID=%@", person.identifier);
                NSLog(@"User Name=%@", [person.name.givenName stringByAppendingFormat:@" %@", person.name.familyName]);
                NSLog(@"Gender=%@", person.gender);
            }
        }];
    }
}

Hope, this will help you

Answer 2

This is the easiest and the simplest way of fetching the current logged in user's email id first create an instance variable of GPPSignIn class

GPPSignIn *signIn;

then initialize it in the viewDidLoad

- (void)viewDidLoad
 {
 [super viewDidLoad];

  static NSString * const kClientID = @"your client id";
  signIn = [GPPSignIn sharedInstance];
  signIn.clientID= kClientID;
  signIn.scopes= [NSArray arrayWithObjects:kGTLAuthScopePlusLogin, nil];
  signIn.shouldFetchGoogleUserID=YES;
  signIn.shouldFetchGoogleUserEmail=YES;
  signIn.delegate=self;

 }

next implement the GPPSignInDelegate in your view controller here you can get the logged in user's email id

 - (void)finishedWithAuth:(GTMOAuth2Authentication *)auth
           error:(NSError *)error
 {  
  NSLog(@"Received Access Token:%@",auth);
  NSLog(@"user google user id  %@",signIn.userEmail); //logged in user's email id
 }