AWS Cognito Facebook身份和用户池

我正在尝试使用Cognito联合身份验证来与Facebook进行身份验证，并在Cognito用户池中创建用户并映射用户属性 .

AWS Congnito服务配置，我认为是正确的，因为我与Web应用程序完美配合 . 然而，当尝试使用iOS应用程序时，尽管所有工作都在代码中并使用Facebook进行身份验证并假设经过身份验证的角色，但池中不会创建任何用户 .

我根据Cognito“基本（经典）Authflow”使用下面的代码流程详细信息这是正确的方法，是否在用户池中创建了用户？

getId，getOpenIdToken，assumeRoleWithWebIdentity .

AWSCognitoIdentityGetIdInput *input = [[AWSCognitoIdentityGetIdInput alloc] init];
[input setIdentityPoolId:poolId];
[input setAccountId:@"XXXXXXXXXXXX"];
NSDictionary *logons = @{@"graph.facebook.com":tknStr};
[input setLogins:logons];

AWSCognitoIdentity *id = [AWSCognitoIdentity defaultCognitoIdentity];

[id getId:input completionHandler:^(AWSCognitoIdentityGetIdResponse * _Nullable response, NSError * _Nullable error) {
    if (error)
    {
        //handle the error        
    }
    else
    {
        AWSCognitoIdentityGetCredentialsForIdentityInput *getCredsInput = [AWSCognitoIdentityGetCredentialsForIdentityInput new];
        [getCredsInput setCustomRoleArn:@"arn:aws:iam::XXXXXXXXX:role/XXXXXXXXXXXXXXX”];
        [getCredsInput setIdentityId:[response identityId]];
        [getCredsInput setLogins:logons];
        AWSCognitoIdentityGetOpenIdTokenInput *openID = [AWSCognitoIdentityGetOpenIdTokenInput new];
        [openID setIdentityId:[response identityId]];
        [openID setLogins:logons];
        [id getOpenIdToken:openID completionHandler:^(AWSCognitoIdentityGetOpenIdTokenResponse * _Nullable response, NSError * _Nullable error) {
            if (error)
                NSLog(@"task.error - %@",error);
            else
            {
                AWSSTS *sts = [AWSSTS defaultSTS];
                AWSSTSAssumeRoleWithWebIdentityRequest *request = [[AWSSTSAssumeRoleWithWebIdentityRequest alloc] init];
                [request setRoleArn:@"arn:aws:iam::XXXXXXXXX:role/XXXXXXXXXXXXXXX”];
                [request setRoleSessionName:@"ginger55"];
                [request setWebIdentityToken:[response token]];
                [sts assumeRoleWithWebIdentity:request completionHandler:^(AWSSTSAssumeRoleWithWebIdentityResponse * _Nullable response, NSError * _Nullable error) {
                    if (error)
                    {
                        NSLog(@"task.error - %@",error);
                    }
                    else
                    {
                        NSLog(@“response = %@",response);
                    }
                }];
            }
        }];
    }
}];

任何帮助赞赏 .