Save Data on iOS

I want save data with asset Save Data 1.0 from Arkham Interactive, is a free asset. It works perfectly with pc edition, and works on android chanching streamingAssets for persistentDataPath. But I want this app in my iPhone, and all works fine, but not save, or not load. I don't kown. This is what I changed:

 public static SaveData persistentDataPath(string fileName)
     {
         return Load(Application.persistentDataPath + "\\" + fileName);
     }
 public void Save() { Save(Application.persistentDataPath + "\\" + fileName +extension); }

and on the script where I want save:

 private void Start()
     {
         data = new SaveData(fileName);
         temporal.text = (Application.persistentDataPath+"\\");
         pos = clientNumero1.transform.position;
         Debug.Log(Application.persistentDataPath);
         if(File.Exists(Application.persistentDataPath + "\\" + fileName + ".uml"))
         {
             data = SaveData.Load(Application.persistentDataPath + "\\" + fileName + ".uml");
         }
         else
         {
             data.Save();
         }