Unity 物体根据手指拖动而转动（可用于物体的360度展示）（手机端）

private Vector3 startFingerPos;
private Vector3 nowFingerPos;
private float xMoveDistance;
private float yMoveDistance;
private int backValue = 0;
public GameObject obj;
void Update()
{
if (Input.touchCount <= 0)
{
return;
}

if (Input.GetTouch(0).phase == TouchPhase.Began)
{
//Debug.Log("======开始触摸=====");
startFingerPos = Input.GetTouch(0).position;
}

nowFingerPos = Input.GetTouch(0).position;

if ((Input.GetTouch(0).phase == TouchPhase.Stationary) || (Input.GetTouch(0).phase == TouchPhase.Ended))
{
startFingerPos = nowFingerPos;
//Debug.Log("======释放触摸=====");
return;
}
//          if (Input.GetTouch(0).phase == TouchPhase.Ended) {
//
//          }
if (startFingerPos == nowFingerPos)
{
return;
}
xMoveDistance = Mathf.Abs(nowFingerPos.x - startFingerPos.x);
yMoveDistance = Mathf.Abs(nowFingerPos.y - startFingerPos.y);

if (xMoveDistance > yMoveDistance)
{
if (nowFingerPos.x - startFingerPos.x > 0)
{
//Debug.Log("=======沿着X轴负方向移动=====");
backValue = -1; //沿着X轴负方向移动
}
else
{
//Debug.Log("=======沿着X轴正方向移动=====");
backValue = 1; //沿着X轴正方向移动
}
}
else
{
if (nowFingerPos.y - startFingerPos.y > 0)
{
//Debug.Log("=======沿着Y轴正方向移动=====");
backValue = 2; //沿着Y轴正方向移动
}
else
{
//Debug.Log("=======沿着Y轴负方向移动=====");
backValue = -2; //沿着Y轴负方向移动
}

}
if (backValue == -1)
{
obj.transform.Rotate(Vector3.up * -1 * Time.deltaTime * 50, Space.World);
}
else if (backValue == 1)
{
obj.transform.Rotate(Vector3.up * Time.deltaTime * 50, Space.World);
}
else if (backValue == 2)
{
obj.transform.Rotate(Vector3.right * Time.deltaTime * 50, Space.World);
}
else if (backValue == -2)
{
obj.transform.Rotate(Vector3.right * -1 * Time.deltaTime * 50, Space.World);
}

}