多点触屏

  Vector2 V1, V2;
    float Distance_now, Distance_last;
    void Update()
    {
        if (Input.touchCount == 0)
        {
            Debug.Log("s");
            Distance_now = 0; Distance_last = 0;
        }
        if (Input.touchCount == 1)
        {
            Debug.Log("1"); 
            Distance_now = 0; Distance_last = 0;
            //旋转
        }
        if (Input.touchCount == 2)
        {
            if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
            {
                V1 = Input.GetTouch(0).position; 
                V2 = Input.GetTouch(1).position;
                Distance_now = Vector2.Distance(V1,V2);
                if (Distance_now > Distance_last)
                {
                    //放大
                    transform.localScale *= 1.03f;
                }
                if (Distance_now < Distance_last)
                {
                    transform.localScale *= 0.97f;
                    //缩小
                }
                Distance_last = Distance_now;
                
            }

        }
    }