tk2dButton.Update C# (CSharp) Method

    void Update()
    {
        if (buttonDown) // only need to process if button isn't down
            return;

        #if !UNITY_FLASH
        if (Input.multiTouchEnabled)
        {
            for (int i = 0; i < Input.touchCount; ++i)
            {
                Touch touch = Input.GetTouch(i);
                if (touch.phase != TouchPhase.Began) continue;
                Ray ray = viewCamera.ScreenPointToRay(touch.position);
                RaycastHit hitInfo;
                if (collider.Raycast(ray, out hitInfo, 1.0e8f))
                {
                    if (!Physics.Raycast(ray, hitInfo.distance - 0.01f))
                    {
                        StartCoroutine(coHandleButtonPress(touch.fingerId));
                        break; // only one finger on a buton, please.
                    }
                }
            }
        }
        else
        #endif
        {
            if (Input.GetMouseButtonDown(0))
            {
                Ray ray = viewCamera.ScreenPointToRay(Input.mousePosition);
                RaycastHit hitInfo;
                if (collider.Raycast(ray, out hitInfo, 1.0e8f))
                {
                    if (!Physics.Raycast(ray, hitInfo.distance - 0.01f))
                        StartCoroutine(coHandleButtonPress(-1));
                }
            }
        }
    }