cocos2d。如何创建弹出式模态对话框（使用CCLayer）

我需要做一个模态对话框（继承自CCLayer），显示在主图层的中心。
在显示时，您不能在对话框外按任何其他按钮。
就像一个正常的模式窗口在MS Windows系统。

I need to make a modal dialog(inherited from CCLayer) that is showing in the center of the main layer. While it is showing, you can not press any other button outside the dialog. Just like a normal modal window in MS Windows System.

问题是，我不知道如何禁用主动的触摸事件，而对话框

The problem is that I can not figure out how to disable the mainlayer's touch events while the dialog is showing.

任何帮助将被禁止。