private static bool CheckIfNeedBack(UIPage page)
 {
     return(page != null && page.CheckIfNeedBack());
 }
    /// <summary>
    /// Close target page
    /// </summary>
    public static void ClosePage(UIPage target)
    {
        //UIInteractive.GetInstance().iPage = null;
        if (target == null)
        {
            return;
        }
        if (target.isActive() == false)
        {
            if (m_currentPageNodes != null)
            {
                for (int i = 0; i < m_currentPageNodes.Count; i++)
                {
                    if (m_currentPageNodes[i] == target)
                    {
                        m_currentPageNodes.RemoveAt(i);
                        break;
                    }
                }
                return;
            }
        }

        if (m_currentPageNodes != null && m_currentPageNodes.Count >= 1 && m_currentPageNodes[m_currentPageNodes.Count - 1] == target)
        {
            m_currentPageNodes.RemoveAt(m_currentPageNodes.Count - 1);

            //show older page.
            //TODO:Sub pages.belong to root node.
            if (m_currentPageNodes.Count > 0)
            {
                UIPage page = m_currentPageNodes[m_currentPageNodes.Count - 1];
                if (page.isAsyncUI)
                {
                    ShowPage(page.name, page, () =>
                    {
                        target.Hide();
                    });
                }
                else
                {
                    ShowPage(page.name, page);
                    target.Hide();
                }

                return;
            }
        }
        else if (target.CheckIfNeedBack())
        {
            for (int i = 0; i < m_currentPageNodes.Count; i++)
            {
                if (m_currentPageNodes[i] == target)
                {
                    m_currentPageNodes.RemoveAt(i);
                    target.Hide();
                    break;
                }
            }
        }

        target.Hide();
    }