17-auth-controller-delegate.swift

extension AuthViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        let cred = authorization.credential as! ASAuthorizationAppleIDCredential
        let code = String(data: cred.authorizationCode!, encoding: .utf8)!
        
        var name: String? = nil
        if let fullName = cred.fullName {
            name = PersonNameComponentsFormatter().string(from: fullName)
        }
        
        let request = AuthRequest(appleUid: cred.user, appleAuthCode: code, name: name)

        authenticate(request: request) { [weak self] res, error in 
            DispatchQueue.main.async {
                guard let res = res else {
                    let alert = UIAlertController(title: "Error", message: error, preferredStyle: .alert)
                    alert.addAction(UIAlertAction(title: "OK", style: .default))
                    self?.present(alert, animated: true)
                    return
                }
                
                Client.config = .init(apiKey: res.apiKey, logOptions: .info)
                let extraData = UserExtraData(name: res.name)
                let user = User(id: res.streamId, extraData: extraData)
                Client.shared.set(user: user, token: res.streamToken)
            
                self?.performSegue(withIdentifier: "kAuthToContactsSegueId", sender: nil)
            }
        }
    }
}