Can't get ng-hide & ng-show to work with tokens

Question

My problem is similar to this : ng-show and ng-hide with jwt

Although i modified as instructed by user3735441, i still can't make them work properly:

Service :

'use strict';

/**
 * @ngdoc service
 * @name ToDoManagerApp.authToken
 * @description
 * # authToken
 * Factory in the ToDoManagerApp.
 */
angular.module('ToDoManagerApp').factory('authToken', function($window) {
    var storage = $window.localStorage;
    var cachedToken;
    var userToken = 'userToken';
    var isAuthenticated = false;
    // Public API here
    var authToken = {
        setToken: function(token) {
            cachedToken = token;
            storage.setItem(userToken, token);
            isAuthenticated = true;
        },
        getToken: function() {
            if(!cachedToken)
              cachedToken = storage.getItem(userToken);

            return cachedToken;
        },
        isAuthenticated: function() {
            return !!authToken.getToken();
        },
        removeToken: function() {
            cachedToken = null;
            storage.removeItem(userToken);
            isAuthenticated = false;

        }
    };

    return authToken;
});

Controller :

angular.module('ToDoManagerApp').controller('HeaderCtrl', function($scope, authToken) {
    $scope.isAuthenticated = authToken.isAuthenticated;

});

HTML :

<div ng-controller = "HeaderCtrl" class="header">
  <div class="navbar navbar-default" role="navigation">
    <div class="container">
      <div class="navbar-header">

        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#js-navbar-collapse">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>

        <a class="navbar-brand" href="#/">ToDoManager</a>
      </div>

      <div class="collapse navbar-collapse" id="js-navbar-collapse">

        <ul class="nav navbar-nav">
          <li ui-sref-active="active">
            <a ui-sref="main">Home</a>
          </li>
          <li ng-hide="isAuthenticated()" ui-sref-active="active">
            <a ui-sref="register">Register</a>
          </li>
          <li ng-show="isAuthenticated()" ui-sref-active="active">
            <a ui-sref="logout">Logout</a>
          </li>
        </ul>
      </div>
    </div>
  </div>
</div>

What i'm trying to do is to :

1 - show register, hide logout when no token is set (not authenticated) OR 2 - show logout, hide register when a token is set (authenticated)

For now i'm stuck with the first state, authenticated or not i can't see the logout button.

Answer 1

I completly forgot to add 'res' in my register controller, that's why it wasn't updated :

$http.post(url, user)
            .success(function(res) {
                alert('success', 'OK!', 'You are now registered');
                authToken.setToken(res.token);
            })