根据Unity里面提供的Application.OpenURL来打开一个外部的链接

 App Store 上评论的链接地址是 itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id = appID。

代码如下：

    void OnGUI()

    {

        if(GUI.Button(new Rect(20,20,20,20),"点击评论"))

        {    

            #if UNITY_IPHONE || UNITY_EDITOR

            const string APP_ID = "564457517";//appID

            var url = string.Format(

                "itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?       type=Purple+Software&id={0}",

                APP_ID);

            Application.OpenURL(url);

            #endif

        }

    }