unity 移动端 判断手指左滑还是右滑

    enum slideVector { nullVector, left, right };
    private Vector2 lastPos;//上一个位置
    private Vector2 currentPos;//下一个位置
    private slideVector currentVector = slideVector.nullVector;//当前滑动方向
    private float timer;//时间计数器
    public float offsetTime = 0.01f;//判断的时间间隔
void update(){
  if (Input.touchCount == 1)
        {
            if (Input.touches[0].phase == TouchPhase.Began)
            {
                lastPos = Input.touches[0].position;
                currentPos = Input.touches[0].position;
                timer = 0;
                Debug.Log("Click begin && Drag begin");
            }
            if (Input.touches[0].phase == TouchPhase.Moved)
            {
                currentPos = Input.touches[0].position;
                timer += Time.deltaTime;
                if (timer > offsetTime)
                {
                    if (currentPos.x < lastPos.x)
                    {
                        if (currentVector == slideVector.left)
                        {
                            return;
                        }
                        //TODO trun Left event
                        currentVector = slideVector.left;
                        Debug.Log("Turn left");
                    }
                    if (currentPos.x > lastPos.x)
                    {
                        if (currentVector == slideVector.right)
                        {
                            return;
                        }
                        //TODO trun right event
                        currentVector = slideVector.right;
                        Debug.Log("Turn right");
                    }
                    lastPos = currentPos;
                    timer = 0;
                }
            }
            if (Input.touches[0].phase == TouchPhase.Ended)
            {//滑动结束
                currentVector = slideVector.nullVector;
                Debug.Log("Click over && Drag over");
            }}