Application.persistentDataPath is not working in Ios Device?

I am Using this Code which is working fine in android but not in ios devices to save and load the data in different scenes. Can you please tell where do i need to edit the script exactly?

public void Save() {

     BinaryFormatter bf = new BinaryFormatter ();// CREATES A BINARY FORMATTER
     FileStream file = File.Create(Application.persistentDataPath + "/playerInfor.dat"); // CREATES A FILE

     PlayerData data = new PlayerData (); // CREATES A CONTAINER FOR OBJECTS
     data.scoreValue = scoreValue;
     data.bestScoreValue = bestScoreValue;

     bf.Serialize (file, data); //WRITE THE DATA OF PLAYERDATA INTO FILE
     file.Close ();
 }

 public void Load()
 {
     if(File.Exists(Application.persistentDataPath + "/playerInfor.dat"))
     {
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Open(Application.persistentDataPath + "/playerInfor.dat", FileMode.Open);
         PlayerData data = (PlayerData)bf.Deserialize(file); // CASTING IS USED TO KNOW THE OBJECTS FROM FILE ARE OF PLAYERDATA.
         file.Close();
         scoreValue = data.scoreValue;
         bestScoreValue = data.bestScoreValue; 
     }
 }