void Update()
{
for (int i = 0; i < uis.Count; ++i)
{
uis[i].refresh(user.usages[i]);
}
tex_gold.text = user.currentGold.ToString();
RobotsManager m = App.Instance.gameView.robotsManager;
tex_robots.text = m.getRobotsAvailablesCount().ToString() + " / " + m.Robots.Count.ToString();
}