Application.dataPath : 数据路径

Unity Editor: <path tp project folder>/Assets

Unity 编辑器：<工程文件夹的路径>/Assets 

 在IOS真机设备中 需要在<path to player app bundle>/Documents路径下才可以读写。 

unity3d中通过如下操作获取Document文件路径

    public string Path
    {
        get{
            string    path=null;
            if(Application.platform==RuntimePlatform.IPhonePlayer)
            {
                path= Application.dataPath.Substring (0, Application.dataPath.Length - 5);
                path = path.Substring(0, path.LastIndexOf('/'))+"/Documents/";    
            }
            else
            {
                path=Application.dataPath+"/Resource/GameData/";
            }
            return path;
        }     
    }