didCompleteWithAuthorization

didCompleteWithAuthorization.swift

func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
    switch authorization.credential {
    case let appleIDCredential as ASAuthorizationAppleIDCredential:
      if let identityToken = appleIDCredential.identityToken,
        let token = String(data: identityToken, encoding: .utf8),
        let decodedToken = try? decode(jwt: token) {
        // do your thing here 
      } else {
        // something went wrong, handle it
      }
    default:
      //
      break
    }
  }