【NGUI】NGUI适配源码

  float defaultWHRate = 800f / 480f;
        float ScreenWHRate = (float)Screen.width / (float)Screen.height;
        bool isUseHResize = defaultWHRate >= ScreenWHRate ? false : true;        
        UIRoot root = GameObject.Find("ROOT").GetComponent<UIRoot>();
        if (!isUseHResize)
        {
            float curScreenH = (float)Screen.width / defaultWHRate;
            float Hrate = curScreenH / Screen.height;
            root.manualHeight =(int)(480f / Hrate);
        }
        else
        {
            root.manualHeight = 480;
        }