unity iOS 多点触控

using UnityEngine;
using System.Collections;
public class Test : MonoBehaviour {
public Texture2D imageMenu;

public  Texture2D imageItem ;
void Awake(){

}
void  OnGUI () {
iPhone =Input.GetTouch ();
 

GUI.DrawTexture(Rect(0,0,640,960),imageMenu);
touchCount = iPhoneInput.touchCount;
for(var i = 0; i < touchCount; i++)
{
iPos = iPhoneInput.GetTouch(i).position;
float x = iPos.x;
float y = iPos.y;
GUI.DrawTexture(Rect(x,960 - y ,120,120),imageItem);
GUI.Label(Rect(x, 960 - y,120,120),"Touch position is  " + iPos);
}

}
}