我想用这段代码获取用户的生日:GTLQueryPlus*query=[GTLQueryPlusqueryForPeopleGetWithUserId:@"me"];GTLServicePlus*plusService=[[GTLServicePlusalloc]init];plusService.retryEnabled=YES;[plusServicesetAuthorizer:authObj];[plusServiceexecuteQuery:querycompletionHandler:^(GTLServiceTicket*ticket,GTLPlusPerson*person,