Sign in with Apple Button

[trydalch]

I figured out how to add a Sign in with Apple button. There may be more simple or elegant solutions, but because I haven't seen any documentation or examples anywhere, I wanted to share here for anyone else who might search for it in the future.

It's also likely this could be cleaned up and improved upon, but it's functional.

It's possible to achieve this with Maui embedding, but due to a current visual studio issue, if you add Maui embedding to your project you can no longer use Hot Restart and debug on your physical iOS device.

The snippets below are the essential bits to add to your page or user control. The button needs to be injected into the visual tree either in the code behind or view model. We did it in the code behind.

using AuthenticationServices;
using Foundation;
using UIKit;

// In the user control constructor, or page constructor
var appleSignInButton = new ASAuthorizationAppleIdButton(ASAuthorizationAppleIdButtonType.Default, ASAuthorizationAppleIdButtonStyle.WhiteOutline);

appleSignInButton.TouchUpInside += HandleAuthorizationAppleIDButtonPress;
            appleSignInButton.CornerRadius = 50;

var adaptedAppleButton = VisualTreeHelper.AdaptNative(appleSignInButton);
var borderWrapper = new Border
{
    MinHeight = 50,
    MinWidth = 250,
    HorizontalAlignment = HorizontalAlignment.Center,
    Child = adaptedAppleButton,
};

m_MainStackPanel.Children.Add(borderWrapper);

        private void HandleAuthorizationAppleIDButtonPress(object sender, EventArgs e)
        {
            var appleIDProvider = new ASAuthorizationAppleIdProvider();

            ASAuthorizationAppleIdRequest request = appleIDProvider.CreateRequest();
            request.RequestedScopes = new[] { ASAuthorizationScope.FullName, ASAuthorizationScope.Email };

            var authorizationController = new ASAuthorizationController(new ASAuthorizationRequest[] { request });
            authorizationController.Delegate = _appleSignInDelegate;  // Use the retained delegate
            authorizationController.PresentationContextProvider = new PresentationContextProvider();  // Set the presentation context provider
            authorizationController.PerformRequests();

            authorizationController.Delegate = _appleSignInDelegate;
        }

public class AuthorizationControllerDelegate : ASAuthorizationControllerDelegate
{
    private readonly MyUserControl _parent;

    public AuthorizationControllerDelegate(MyUserControl parent)
    {
        _parent = parent;
    }

    public override void DidComplete(ASAuthorizationController controller, ASAuthorization authorization)
    {
        System.Diagnostics.Debug.WriteLine("Authorization successful.");

        try
        {
            var appleIdCredential = authorization.GetCredential<ASAuthorizationAppleIdCredential>();

            var userIdentifier = appleIdCredential?.User;

           // fullName and email will only have values the first time the user taps the button. They will be null for all subsequent taps. 
            var fullName = appleIdCredential?.FullName;
            var email = appleIdCredential?.Email;


            ZClientUI_WAR.UserSignIn_Apple(userIdentifier, email, fullName.GivenName, fullName.FamilyName);
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine($"Authorization Error: {ex.Message}");
        }
    }

    public override void DidComplete(ASAuthorizationController controller, NSError error)
    {
        // Handle error
        System.Diagnostics.Debug.WriteLine($"Authorization Error: {error.LocalizedDescription}");
    }

    private void SaveUserInKeychain(string userIdentifier)
    {
        System.Diagnostics.Debug.WriteLine("Saving in keychain...");
        // Implement keychain or secure storage saving
    }
}

public class PresentationContextProvider : NSObject, IASAuthorizationControllerPresentationContextProviding
{
    public UIWindow GetPresentationAnchor(ASAuthorizationController controller)
    {
        // Get the current view controller
        return GetCurrentViewController()?.View?.Window;
    }

    // Helper method to get the current view controller
    private UIViewController GetCurrentViewController()
    {
        var rootController = UIApplication.SharedApplication.KeyWindow?.RootViewController;

        if (rootController == null)
        {
            return null;
        }

        UIViewController currentController = rootController;
        while (currentController.PresentedViewController != null)
        {
            currentController = currentController.PresentedViewController;
        }

        return currentController;
    }
}

[ajpinedam]

Thank you for this!

[agneszitte]

Hi @trydalch Thank you so much for sharing the details, really appreciated!

[ajpinedam]

@morning4coffe-dev I can help with this doc

cc: @agneszitte

[morning4coffe-dev]

I see, no problem at all @trydalch, we are grateful for what you did already. @ajpinedam Awesome, let's discuss more details internally

[morning4coffe-dev]

@trydalch Feel free to have a look at my PR #18410 and suggest any changes. We are also thinking of ways to add it to wizard/toolkit at the moment.

[trydalch]

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