Can I use google drive sdk with authentication info from google sign-in sdk on iOS?

Question

We already have a login module uses Google Sign-In sdk. Google Sign-In gives a GIDAuthentication object after login succeed.

Now I want to access user\'s google dri

Answer 1

/ Creates the auth controller for authorizing access to Google Drive.
- (GTMOAuth2ViewControllerTouch *)createAuthController
{
    GTMOAuth2ViewControllerTouch *authController;
    authController = [[GTMOAuth2ViewControllerTouch alloc] initWithScope:@"https://www.googleapis.com/auth/drive"
                                                                clientID:kClientID
                                                            clientSecret:kClientSecret
                                                        keychainItemName:kKeychainItemName
                                                                delegate:self
                                                        finishedSelector:@selector(viewController:finishedWithAuth:error:)];
    return authController;
}

// Handle completion of the authorization process, and updates the Drive service
// with the new credentials.
- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController
      finishedWithAuth:(GTMOAuth2Authentication *)authResult
                 error:(NSError *)error
{
    if (error != nil)
    {
        [self showAlert:@"Authentication Error" message:error.localizedDescription];
        self.driveService.authorizer = nil;
    }
    else
    {
        self.driveService.authorizer = authResult;
        [self.navigationController dismissViewControllerAnimated:YES completion:nil];
    }
}-(void)loadDriveFiles
{
    NSMutableArray *driveFiles = [[NSMutableArray alloc] init];
    NSMutableArray *downloadFiles = [[NSMutableArray alloc] init];

    GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
    query.q = [NSString stringWithFormat:@"'%@' IN parents", @"root"];
    [self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
                                                              GTLDriveFileList *files,
                                                              NSError *error) {
        if (error == nil)
        {
            for(id key in files.items) {
                NSString *titleStr = [key valueForKey:@"title"];
                [driveFiles addObject:titleStr];

                NSString *downloadStr = [key valueForKey:@"downloadUrl"];
                [downloadFiles addObject:downloadStr];
            }
            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
            FilesViewController *filesView = (FilesViewController *)[storyboard instantiateViewControllerWithIdentifier:@"filesView"];
            [filesView initwithName:driveFiles anddownload:downloadFiles];
            [self.navigationController pushViewController:filesView animated:YES];
        }
        else
        {
            NSLog(@"An error occurred: %@", error);
        }
    }];
}