AWS SDK for iOS 2.7.0+

BasicAuthViewController2.7.swift

import UIKit
import AWSMobileClient

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        initializeAWSMobileClient() // Initialize the AWSMobileClient
    }
    
    // Initializing the AWSMobileClient and take action based on current user state
    func initializeAWSMobileClient() {
        AWSMobileClient.sharedInstance().initialize { (userState, error) in
            
            //self.addUserStateListener() // Register for user state changes
            
        if let userState = userState {
            switch(userState){
            case .signedIn: // is Signed IN
                print("Logged In")
                print("Cognito Identity Id (authenticated): \(AWSMobileClient.sharedInstance().identityId))")
            case .signedOut: // is Signed OUT
                print("Logged Out")
                DispatchQueue.main.async {
                    self.showSignIn()
                }
            case .signedOutUserPoolsTokenInvalid: // User Pools refresh token INVALID
                print("User Pools refresh token is invalid or expired.")
                DispatchQueue.main.async {
                    self.showSignIn()
                }
            case .signedOutFederatedTokensInvalid: // Facebook or Google refresh token INVALID
                print("Federated refresh token is invalid or expired.")
                DispatchQueue.main.async {
                    self.showSignIn()
                }
            default:
                AWSMobileClient.sharedInstance().signOut()
            }
        } else if let error = error {
            print(error.localizedDescription)
        }
    }
}
//...
}