public void RegisterUser(string email, Webservice.OnResponseCallback onFinish = null)
        {
            Webservice.Instance.registerUser(email, (r, m) =>
            {
                if (r)
                {
                    // Guardar datos en playerpref
                    PlayerPrefs.SetString("Email", email);

                    // Cambiar de escena
                    AppManager.Instance.LoadMainMenu();
                }

                if (onFinish != null)
                {
                    onFinish(r, m);
                }
            });
        }
        public void setLikeExposition(Webservice.OnResponseCallback response = null)
        {
            Exposition expo = arrExposition.Single((ex) => ex.id == currExposition.id);

            User u = new User();

            u.id                = AppManager.Instance.currUser.id;
            u.email             = AppManager.Instance.currUser.email;
            u.idLikeExpositions = AppManager.Instance.currUser.idLikeExpositions;

            bool exists = u.idLikeExpositions.Any((l) => l == expo.id);

            if (exists)
            {
                // Eliminar like
                u.idLikeExpositions.Remove(expo.id);

                Webservice.Instance.deleteLike(expo.id, (s, m) =>
                {
                    if (s)
                    {
                        expo.isLiked = !exists;

                        AppManager.Instance.currUser = u;
                    }
                    else
                    {
                        // Problemas con el servidor
                    }

                    if (response != null)
                    {
                        response(s, m);
                    }
                });
            }
            else
            {
                // Agregar like
                u.idLikeExpositions.Add(expo.id);

                Webservice.Instance.addLike(expo.id, (s, m) =>
                {
                    if (s)
                    {
                        expo.isLiked = !exists;

                        AppManager.Instance.currUser = u;
                    }
                    else
                    {
                        // Problemas con el servidor
                    }

                    if (response != null)
                    {
                        response(s, m);
                    }
                });
            }
        }