ios - How to check if user login to AWS Cognito for the first time?

Question

I'm using mobile hub and Amazon Cognito to authenticate user by using Facebook provider. Once use login with Facebook I need to check if this is first time login to the app or not. If it is first time I need to get some information and if it is already sign-up to the app I need to get some information related to the user from dynamoDB. I was wondering what would be the best way to find out if user login to the app for the first time.

#import <AWSMobileHubHelper/AWSMobileHubHelper.h>

@implementation UserIdentityAccess

- (NSString *)getUserIdentity {
    return [AWSIdentityManager defaultIdentityManager].identityId;
}

Answer 1

如果您已经在使用 Dynamo 来存储用户元数据，那么您可能会使用它来存储标识 id x 之前是否见过的标志。

或者，可以在此处使用 Cognito Sync。您可以在数据集中放置一条记录来跟踪它是否已经被看到，然后检查它是否存在。这带来的一个好处是它为您将其存储在身份 ID 上，因此您不必自己处理身份 ID 到数据映射。此处提供有关 Cognito 同步的更多信息。