Sign in with Apple

SignInWithApple.swift

import UIKit
import AuthenticationServices

class LoginViewController: UIViewController {
  
  override func viewDidLoad() {
    super.viewDidLoad()
    setupAppleSignIn()
  }
  
  func setupAppleSignIn() {
        if #available(iOS 13.0, *) {
            let appleSignInButton = ASAuthorizationAppleIDButton(type: .default, style: .whiteOutline)
            appleSignInButton.frame = CGRect(x: 0, y: 0, width: 44, height: 44)
            appleSignInButton.layer.cornerRadius = 22
            appleSignInButton.clipsToBounds = true
            appleSignInButton.addTarget(self, action: #selector(didClickOnAppleSignIn), for: .touchUpInside)
          //Add appleSignInButton to your view as subview
        } else {
            // Fallback on earlier versions
        }
        
    }
  
   @objc func didClickOnAppleSignIn() {
        if #available(iOS 13.0, *) {
            let appleIDProvider = ASAuthorizationAppleIDProvider()
            let request = appleIDProvider.createRequest()
            request.requestedScopes = [.fullName, .email]
            let authorizationController = ASAuthorizationController(authorizationRequests: [request])
            authorizationController.delegate = self
            authorizationController.presentationContextProvider = self
            authorizationController.performRequests()
        } else {
            // Fallback on earlier versions
        }
    }
}

extension LoginViewController: ASAuthorizationControllerDelegate {
     // Failed authorization 
     
    @available(iOS 13.0, *)
    func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
        print(error.localizedDescription)
}
       // Successful authorization
  
    @available(iOS 13.0, *)
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
  
        if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
            
            let appleId = appleIDCredential.user
            let appleUserFirstName = appleIDCredential.fullName?.givenName
            let appleUserLastName = appleIDCredential.fullName?.familyName
            let appleUserEmail = appleIDCredential.email
          //send these details to server
            
        } else if let passwordCredential = authorization.credential as? ASPasswordCredential {
            
            let username = passwordCredential.user
            let password = passwordCredential.password
          
        }
   }
}

extension LoginViewController: ASAuthorizationControllerPresentationContextProviding {
    @available(iOS 13.0, *)
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return self.view.window!
    }
}