NGUI UIButtonをロングタップ対応

using UnityEngine;
using System.Collections;
using System;


[RequireComponent(typeof(UIButton))]
public class UIButtonLongTapComponent : MonoBehaviour
{

    [SerializeField]
    float intervalAction = 1.0f;

    float firstTapTime = 0f;
    bool isHoldAction;
    // 押しっぱなし時に呼び出すAction
    public Action OnLongTap = null;
    public Action OnShortTap = null;

    bool isPressing = false;

    void Update()
    {
        if (isPressing && isHoldAction && (firstTapTime + intervalAction < Time.realtimeSinceStartup)) {
            isPressing = false;
            LongTap ();
        }
    }

    void OnPress (bool pressed)
    {
        isPressing = pressed;
        if (pressed) {
            firstTapTime = Time.realtimeSinceStartup;
        }
        else
        {
            bool isLongTap = firstTapTime + intervalAction < Time.realtimeSinceStartup;
            if (!isHoldAction && isLongTap)
                LongTap();
            else if(!isLongTap)
                ShortTap();
        }
    }

    public void SetButtonAction(Action shortTap, Action longTap, bool isHoldLongTap) {
        isHoldAction = isHoldLongTap;
        OnLongTap = longTap;
        OnShortTap = shortTap;
    }

    public void CleanAction()
    {
        OnLongTap = null;
    }

    public void LongTap()
    {
        if (OnLongTap != null)
            OnLongTap ();
    }
    public void ShortTap()
    {
        if (OnShortTap != null)
            OnShortTap ();
    }

}