Extremely simple sign in with apple test app

Sign in with Apple.swift

/*
In anticipation of iOS 13, I'm implementing Sign in with Apple.
To get started, I just made a simple VC that brings up the auth stuff, without even handling the result.

When running it in a simulator and completing the sign in process, the process appears to be broken:
- The auth controller is not dismissed
- `ASAuthorizationController`'s delegate method `authorizationController:didCompleteWithAuthorization` is not called

The code below is intended as a simple copy+paste to make problem replication easier:
1. Create a new XCode project
2. Choose the "Single View App" template
3. Choose to use StoryBoards (not SwiftUI)
4. (Project name, location, etc doesn't matter)
5. In the project's settings, under the "Signing and Capabilities" tab, add the "Sign in with Apple" capability to your target.
6. Replace the contents of ViewController.swift with the code below.
7. Add breakpoints where indicated (at the two delegate methods).
*/

import UIKit
import AuthenticationServices

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .white
        
        let signInButton = ASAuthorizationAppleIDButton()
        signInButton.addTarget(self, action: #selector(onSignIn), for: .touchUpInside)
        
        self.view.addSubview(signInButton)
        signInButton.translatesAutoresizingMaskIntoConstraints = false
        signInButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        signInButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
    }
    
    @objc private func onSignIn() {
        let request = ASAuthorizationAppleIDProvider().createRequest()
        request.requestedScopes = [.fullName]
        
        let controller = ASAuthorizationController(
            authorizationRequests: [request])
        controller.delegate = self
        controller.presentationContextProvider = self
        controller.performRequests()
    }
}

extension ViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
        print() // <-- Put a breakpoint here
    }
    
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        print() // <-- Put a breakpoint here
    }
}

extension ViewController: ASAuthorizationControllerPresentationContextProviding {
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return self.view.window!
    }
}

/*
Now, when you run the app, tap on the "sign-in" button, and follow the sign-in process.
After you complete the process and enter your password, the auth controller will stay on-screen, and your breakpoints won't get hit.

Environment info
----------------
- MacOS: Mojave 10.14.6 (18G95)
- XCode: Version 11.0 (11A419c)
- Simulator: Version 11.0 (SimulatorApp-912.1 SimulatorKit-570.3 CoreSimulator-681.5.1)
- Simulator iOS: 13.0 (17A577)


*/

This is the screen where you get stuck:

Update: Deploying this app to a real device (not a simulator) resulted in the flow actually working.

• On a simulator, the final step of signing in is where you enter your password (as pictured in the screenshot above)
• On my phone, I didn't get the password option; instead, the phone went to face ID, and completed the flow successfully

This leads me to suspect that the iOS 13 Beta (at least the one on the simulator in the XCode 11 Beta) has a buggy Apple ID auth flow; hopefully this will be fixed in time for the public release of iOS 13!

This sign in with Apple flow seems fine now in iOS 13.1 by the simulator.

This sign in with Apple flow seems fine now in iOS 13.1 by the simulator.

Agreed 👍