How to log in to Facebook in Xamarin.Forms

Question

I want to make a Xamarin.Forms project, targeting iOS, Android and Windows Phone.

My app needs to authenticate users using Facebook.

Should I implement login

Answer 1

Another addition to @NovaJoe's code, on iOS8 with Facebook, you'd need to modify the Renderer class as below to close the View after successful authentication.

auth.Completed += (sender, eventArgs) => {
            // We presented the UI, so it's up to us to dimiss it on iOS.

/*Importand to add this line */

            DismissViewController (true, null);

/* */

            if (eventArgs.IsAuthenticated) {
                App.Instance.SuccessfulLoginAction.Invoke ();

                // Use eventArgs.Account to do wonderful things
                App.Instance.SaveToken (eventArgs.Account.Properties ["access_token"]);


            } else {
                // The user cancelled
            }
        };