Sign in with Apple

extension.swift

extension ViewController: ASAuthorizationControllerDelegate, ASAuthorizationControllerPresentationContextProviding
{
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization)
    {
        guard let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential else { return }
        
        print("USER: \(appleIDCredential.user)")
        print("EMAIL: \(appleIDCredential.email!)")
        print("FULL NAME: \(appleIDCredential.fullName!)")
    }
    
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor
    {
        return self.view.window!
    }
}