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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 

Mac player: <path to player app bundle>/Contents
Mac播放器：<到播放器应用的路径>/Contents 

iPhone player: <path to player app bundle>/<AppName.app>/Data
iPhone播放器：<到播放器应用的路径>/<AppName.app>/Data 

Win player: <path to executablename_Data folder>
Win播放器：< 包含可执行播发器的文件夹的路径>\Data 

Dashboard widget: <path to the dashboard widget bundle>
Dasboard窗口：< dashboard widget bundle的路径> 

Web player: The absolute url to the player data file folder (without the actual data file name)
网络播放器：到播放器数据文件夹的绝对路径（没有实际的数据文件名称）

 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;
        }     
    }