Unity利用GUI做的对话框

在Unity里自己写的对话框，点击按钮弹出对话框，点击对话框中的按钮，退出对话框

部分代码如下

 void OnGUI() {
        GUI.Box(new Rect(Screen.width/2,Screen.height/2,Screen.width/5,Screen.height/4),
            "信息提示");
        GUI.Label(new Rect(Screen.width / 2, Screen.height * 9 / 16,
            Screen.width / 5, Screen.height*3 / 8), "这是一个测试系统，版权归辽宁工程技术大学所有");
        if (GUI.Button(new Rect(Screen.width * 11 / 20, Screen.height * 11 / 16,
            Screen.width / 10, Screen.height / 16), "退出")) {
           GameObject xx = GameObject.Find("Main Camera");
            xx.GetComponent().enabled = false;
        }
       
    }