Authentication with Facebook by using Xamarin.Auth - xamarin

Question

I am using Xamarin.Auth for login with facebook in my app(android/iOS) and all is going well but when successfully loged in, facebook profile is opening and not going back to my application. i want to redirect to my app's home page without showing facebook profile. i am following this tutorial and not get any success. i think i am not giving proper Urls of my app. Please give me suggestions.
your help will be appreciated thanks in advance.
here is my code of loginPageRenderer:
[assembly: ExportRenderer (typeof (FBLoginPage), typeof (LoginPageRendrerr))]
namespace FFirst_app.Droid
{
public class LoginPageRendrerr : PageRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Page> e)
{
base.OnElementChanged(e);
// this is a ViewGroup - so should be able to load an AXML file and FindView<>
var activity = this.Context as Activity;
var auth = new OAuth2Authenticator (
clientId: "7b745e26dbb64e1a3a3bf6bfd33165bc", // your OAuth2 client id
scope: "basic", // the scopes for the particular API you're accessing, delimited by "+" symbols
authorizeUrl: new Uri("https://apps.facebook.com/myappppppp"),//("https://api.instagram.com/oauth/authorize/"), // the auth URL for the service
redirectUrl: new Uri ("http://www.facebook.com/connect/login_success.html")); // the redirect URL for the service
auth.Completed += (sender, eventArgs) => {
if (eventArgs.IsAuthenticated)
{
App.SuccessfulLoginAction.Invoke();
// Use eventArgs.Account to do wonderful things
App.SaveToken(eventArgs.Account.Properties["access_token"]);
string sessionToken = App.Token; // /* Authenticate the user with Facebook and fetch a session token */;
DateTime expiration = DateTime.Today; ///* The expiration time for the session token */;
string facebookId = Constants.FBAppId;
ParseFacebookUtils.LogInAsync (facebookId, sessionToken, expiration);
} else {
// The user cancelled
}
};
activity.StartActivity (auth.GetUI(activity));
}
}
}

Answer 1

I have found answer that i was wrong with URL's and now its working after when i changed 'authorizeUrl:' to "http://www.facebook.com/connect/login_success.html" and this URl also set on FB App as it is.So now my code is working properly.

Answer 2

On the Xamarin.Auth Getting Started page, it is mentioned that it is up to you to dismiss the UI on iOS:
auth.Completed += (sender, eventArgs) => {
// We presented the UI, so it's up to us to dimiss it on iOS.
**> DismissViewController (true, null); <**
if (eventArgs.IsAuthenticated) {
// Use eventArgs.Account to do wonderful things
} else {
// The user cancelled
}
};