当相机移动时，如何使内部操纵杆保持在屏幕上？

Question

我是第一次开发手机游戏，及其2D自上而下的射手。我有一个问题，当相机移动跟随播放器时，操纵杆的中部被抛在后面。当相机静止时，一切正常，但是我真的不知道如何在相机移动时使中央操纵杆保持在正确的位置。我真的很感谢我如何做到这一点，但我宁愿自己写代码以进行自我完善。

（我知道代码是一团糟，对不起）

   void Update()
    {
        touchNum = Input.touchCount;
        if (touchNum > 0)
        {

            for (int i = 0; i <= (touchNum - 1); i++)
            {
                touch = Input.GetTouch(i);
                touchPosition1 = Camera.main.ScreenToWorldPoint(touch.position);
                if (area.OverlapPoint(touchPosition1))
                {
                    switch (touch.phase)
                    {
                        case TouchPhase.Began:
                            startPos = touchPosition1;
                            joyBack.transform.position = startPos;
                            joyFront.transform.position = startPos;
                            joyBack.SetActive(true);
                            joyFront.SetActive(true);
                            joyFront.transform.position = startPos;
                            joyBack.transform.position = startPos;
                            Debug.Log("begun");
                            break;

                        case TouchPhase.Moved:
                            direction = touchPosition1 - startPos;
                            Vector2 touchPosition2 = Vector2.ClampMagnitude(direction, 1.75f);
                            horizontal = touchPosition2.x;
                            vertical = touchPosition2.y;
                            //Debug.Log(horizontal);
                            distance = horizontal * horizontal + vertical * vertical;
                            distance = Mathf.Sqrt(distance);
                            direction = direction / distance;
                            direction = Limiters(direction, limit);
                            joyFront.transform.position =new Vector2(startPos.x + touchPosition2.x, startPos.y + touchPosition2.y);
                            Debug.DrawLine(startPos, startPos + touchPosition2);
                            Debug.Log(direction);
                            break;

                        case TouchPhase.Ended:
                            distance = 0;
                            Debug.Log("Ended");
                            joyBack.SetActive(false);
                            joyFront.SetActive(false);
                            break;

                    }
                }
                else
                {
                    joyBack.SetActive(false);
                    joyFront.SetActive(false);
                    distance = 0;
                }

            }
        }
    }
    private static Vector2 Limiters(Vector2 direction, float limit)
    {
        if (direction.x > limit)
        {
            direction.x = limit;
        }
        else if (direction.x < -limit)
        {
            direction.x = -limit;
        }
        if (direction.y > limit)
        {
            direction.y = limit;
        }
        else if (direction.y < -limit)
        {
            direction.y = -limit;
        }
        return direction;
    }
    private void FixedUpdate()
    {
        move.Translate((direction) * movespeed * distance * Time.fixedDeltaTime);

    }
}