如何在 iOS 中使用 AWSMobileClient 获取 AWS Cognito 用户属性？

Question

Question is very simple: I've added user authentication to iOS app using AWS Cognito and AWS Amplify. I have successfully implemented sign in and sign up, but how to get user attributes such as email, full name or phone number?

Answer 1

UPDATE:

For AWSMobileClient ~> 2.12.0, you can fetch user attributes as follows.

AWSMobileClient.default().getUserAttributes { (attributes, error) in
     if(error != nil){
        print("ERROR: \(error)")
     }else{
        if let attributesDict = attributes{
           print(attributesDict["email"])
           print(attributesDict["given_name"])
        }
     }
}

Answer 2

Per the documentation there are several property helpers for common attributes like username:

AWSMobileClient.getInstance().getUsername()
AWSMobileClient.getInstance().isSignedIn()
AWSMobileClient.getInstance().getIdentityId()

You can also get the JWT token and then pull out any user attributes:

AWSMobileClient.getInstance().getTokens().getIdToken().getTokenString()

Answer 3

You can use the getUserAttributes with the following API in the latest SDK version 2.8.x :

public func getUserAttributes(completionHandler: @escaping (([String: String]?, Error?) -> Void))

You can find the source code here:

https://github.com/aws-amplify/aws-sdk-ios/blob/master/AWSAuthSDK/Sources/AWSMobileClient/AWSMobileClientExtensions.swift#L532

Answer 4

In case you're looking for the email address specifically, and need to do so potentially offline, this would work for you:

AWSMobileClient.sharedInstance().getTokens { (tokens, error) in
    if let error = error { print(error.localizedDescription) }
    if let tokens = tokens {
        let email = tokens.idToken?.claims?["email"] as? String
        //completionHandler(email)... etc.
    }

While AWSMobileClient.sharedInstance().getUsername() would be convenient, it will return the id of a User Pool user even if the User Pool is set to use email as the username. I consider this a bug, but have yet to report it to AWS.

Answer 5

I also research it on android (Kotlin).

// retrieve username
val username = AWSMobileClient.sharedInstance().username

When you sign in with "email" and "password", "username" is "email".

On the other hand, when the case of iOS (Swift), "username" is really "username" of cognito User Pool, even if you sign in with "email" and "password".

It is so confusing...