TouchScriptNGUI from http://goo.gl/bamSBk for TouchScript (v.8 and below)

TouchScriptNGUI.cs

using System;
using System.Collections.Generic;
using UnityEngine;

// Download the appropriate TouchScript package here:
// https://github.com/DynaBots/Stitch/tree/master/Assets/TouchScript/Packages

using TouchScript;
using TouchScript.InputSources;

/// <summary>
/// Bridge script between TouchScript and NGUI. Simply attach this script to any game object.
/// </summary>

public class TouchScriptNGUI : MonoBehaviour
{
    static public TouchScriptNGUI instance;

    /// <summary>
    /// Whether the multi-touch should be enabled or not.
    /// </summary>

    static public bool isEnabled
    {
        get
        {
            if (instance != null) return instance.enabled;
            return PlayerPrefs.GetInt("Multitouch", 0) == 1;
        }
        set
        {
            PlayerPrefs.SetInt("Multitouch", value ? 1 : 0);
            if (instance != null) instance.enabled = value;
        }
    }

    [System.NonSerialized] bool mActive = false;
    [System.NonSerialized] BetterList<UICamera.Touch> mTouches = new BetterList<UICamera.Touch>();

    void Awake ()
    {
        if (instance == null)
        {
            enabled = isEnabled;
            instance = this;
        }
        else Destroy(gameObject);
    }

    void OnDestroy () { if (instance == this) instance = null; }

    void OnEnable ()
    {
        string operatingSystem = SystemInfo.operatingSystem;

        if (operatingSystem.StartsWith("Windows 8"))
        {
            mActive = true;
            NGUITools.AddMissingComponent<TouchManager>(gameObject);
            NGUITools.AddMissingComponent<Win8TouchInput>(gameObject);
#if UNITY_EDITOR
            Debug.Log("Windows 8 Multi-touch active", this);
#endif
        }
        else if (operatingSystem.StartsWith("Windows 7"))
        {
            mActive = true;
            NGUITools.AddMissingComponent<TouchManager>(gameObject);
            NGUITools.AddMissingComponent<Win7TouchInput>(gameObject);
#if UNITY_EDITOR
            Debug.Log("Windows 7 Multi-touch active", this);
#endif
        }

        if (mActive)
        {
            UICamera.GetInputTouchCount = OnGetTouchCount;
            UICamera.GetInputTouch = OnGetTouch;

            ITouchManager instance = TouchManager.Instance;
            instance.TouchesBegan += OnTouchBegan;
            instance.TouchesEnded += OnTouchEnded;
            instance.TouchesMoved += OnTouchMove;
            instance.TouchesCancelled += OnTouchCancel;
        }
        else enabled = false;
    }

    void OnDisable ()
    {
        if (mActive)
        {
            mActive = false;
            UICamera.GetInputTouchCount = null;
            UICamera.GetInputTouch = null;
            ITouchManager instance = TouchManager.Instance;

            if (instance != null)
            {
                instance.TouchesBegan -= OnTouchBegan;
                instance.TouchesEnded -= OnTouchEnded;
                instance.TouchesMoved -= OnTouchMove;
                instance.TouchesCancelled -= OnTouchCancel;
            }
            mTouches.Clear();
        }
    }

    int OnGetTouchCount () { return mTouches.size; }
    UICamera.Touch OnGetTouch (int index) { return mTouches[index]; }

    void OnTouchBegan (object sender, TouchEventArgs e)
    {
        foreach (ITouch touch in e.Touches)
        {
            if (touch.Tags.HasTag(Tags.INPUT_MOUSE)) continue;

            mTouches.Add(new UICamera.Touch()
            {
                phase = TouchPhase.Began,
                fingerId = touch.Id,
                position = touch.Position,
                tapCount = 1
            });
        }
    }

    void OnTouchEnded (object sender, TouchEventArgs e)
    {
        foreach (ITouch touch in e.Touches)
        {
            if (touch.Tags.HasTag(Tags.INPUT_MOUSE)) continue;

            for (int index = 0; index < mTouches.size; ++index)
            {
                UICamera.Touch t = mTouches[index];

                if (t.fingerId == touch.Id)
                {
                    t.phase = TouchPhase.Ended;
                    t.position = touch.Position;
                    break;
                }
            }
        }
    }

    void OnTouchMove (object sender, TouchEventArgs e)
    {
        foreach (ITouch touch in e.Touches)
        {
            if (touch.Tags.HasTag(Tags.INPUT_MOUSE)) continue;

            for (int index = 0; index < mTouches.size; ++index)
            {
                UICamera.Touch t = mTouches[index];

                if (t.fingerId == touch.Id)
                {
                    t.position = touch.Position;
                    break;
                }
            }
        }
    }

    void OnTouchCancel (object sender, TouchEventArgs e) { OnTouchEnded(sender, e); }

    void LateUpdate ()
    {
        int index = 0;

        while (index < mTouches.size)
        {
            UICamera.Touch touch = mTouches[index];

            if (touch.phase == TouchPhase.Ended)
            {
                mTouches.RemoveAt(index);
            }
            else
            {
                touch.phase = TouchPhase.Moved;
                ++index;
            }
        }
    }
}

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