/// <summary>
        /// 执行更新
        /// </summary>
        /// <param name="deltaTime"></param>
        protected virtual void DoUpdate(float deltaTime)
        {
            AbstractController top = Peek <AbstractController>();

            if (top != null)
            {
                top.ControllerStack = this;
                if (top != selectedController)
                {
                    if (selectedController != null)
                    {
                        OnControllerUnselect(selectedController);
                    }
                    OnControllerSelect(top);
                }
                OnControllerUpdate(top, deltaTime);
            }
            else if (selectedController != null)
            {
                OnControllerUnselect(selectedController);
            }
            selectedController = top;
        }
 /// <summary>
 /// 控制器取消选中
 /// </summary>
 /// <param name="controller"></param>
 protected virtual void OnControllerUnselect(AbstractController controller)
 {
     controller.OnControllerUnselect();
 }
 /// <summary>
 /// 控制器更新
 /// </summary>
 /// <param name="controller"></param>
 /// <param name="deltaTime"></param>
 protected virtual void OnControllerUpdate(AbstractController controller, float deltaTime)
 {
     controller.OnControllerUpdate(deltaTime);
 }