TouchButton

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

public class keyboardButtonScript : MonoBehaviour {
    public  UnityEvent OnTouch;
    public UnityEvent ExitTouch;

    Color defaultColor = new Color (1,1,1,1);
    Color pressedColor = new Color (0.69f,0.69f,0.69f,1);
    SpriteRenderer sr;

    AudioSource sound;

    // Use this for initialization
    void Start () {
        sr = GetComponent<SpriteRenderer>();
        sound = GetComponent<AudioSource>();
    }

    // Update is called once per frame
    void Update () {

    }

    void OnTouchDown()
    {
        OnTouch.Invoke();
        sr.color = pressedColor;
        sound.PlayScheduled(0);
    }

    void OnTouchStay()
    {
        sr.color = pressedColor;
    }

    void OnTouchUp()
    {
        ExitTouch.Invoke();
        sr.color = defaultColor;
    }

    void OnTouchExit()
    {

        sr.color = defaultColor;
    }
}