Using backwards compatible iOS SafariViewController for Xamarin.Forms

I have looked at the Xamarin.Forms sample and it seems unclear to me how I would use (or reference) the iOSClient implementation of SFSafariViewController instead of SFAuthenticationSession with the IBrowser interface. Is it possible to accomplish this with OidcClient2?

[rinkeb]

You could also look at https://github.com/auth0/auth0-oidc-client-net/tree/master/src/Auth0.OidcClient.Xamarin.iOS.

[mleech]

Here’s a (fairly hacky) sample implementation of a pre-iOS 11 IBrowser implementation

public class SafariBrowser : IBrowser
{
    public Task<BrowserResult> InvokeAsync(BrowserOptions options)
    {
        var task = new TaskCompletionSource<BrowserResult>();

        var safari = new SFSafariViewController (new NSUrl (options.StartUrl));

        AppDelegate.CallbackHandler = async url =>
        {
            await safari.DismissViewControllerAsync (true);
            task.SetResult(new BrowserResult()
            {
                Response = url
            });
        };

        // https://forums.xamarin.com/discussion/24689/how-to-acces-the-current-view-uiviewcontroller-from-an-external-service
        var window= UIApplication.SharedApplication.KeyWindow;
        var vc = window.RootViewController;
        while (vc.PresentedViewController != null)
        {
            vc = vc.PresentedViewController;
        }
        vc.PresentViewController (safari, true, null);

        return task.Task;
    }
}

see https://github.com/IdentityModel/IdentityModel.OidcClient.Samples/blob/master/iOSClient/iOSClient/AppDelegate.cs for the implementation and usage of the CallbackHandler property