使用AWSCognitoIdentityProvider进行身份验证以使用DynamoDB

Question

我不明白为什么我的应用程序崩溃时使用此代码。但没有它我无法使用DynamoDB - 我的调试中有这个错误

错误：无法完成操作。 （com.amazonaws.AWSCognitoIdentityErrorDomain错误0。）

错误Domain = com.amazonaws.AWSServiceErrorDomain Code = 6“（null）”UserInfo = {__ type = com.amazon.coral.service #AccessDeniedException，Message = User：arn：aws：sts ::: assume-role / production_auth_MOBILEHUB_ / CognitoIdentityCredentials无权执行：dynamodb：资源上的GetItem：arn：aws：dynamodb：eu-central-1 :: table / production-mobilehub}

    let credentialsProvider = AWSCognitoCredentialsProvider(regionType: .EUCentral1, identityPoolId: "MY_IDENTITY_POOL_ID")
    let configuration = AWSServiceConfiguration(region: .EUCentral1, credentialsProvider: credentialsProvider)
    AWSServiceManager.default().defaultServiceConfiguration = configuration

    credentialsProvider.getIdentityId().continueWith(block: { (task) -> AnyObject? in
        if (task.error != nil) {
            print("Error: " + task.error!.localizedDescription)
        }
        else {
            // the task result will contain the identity id
            let cognitoId = task.result!
            print("Cognito id: \(cognitoId)")
        }
        return task;
    })


        credentialsProvider.setValue(AWSCognitoUserPoolsSignInProviderKey, forKey: Token.sharedInstance.tokenID)