如何通过触摸更平稳地旋转相机轨道？

Question

我如何更平滑地旋转摄像机轨道，而不仅仅是触摸旋转？也就是说，如果旋转后我关闭屏幕，相机仍然可以平稳旋转2秒钟吗？

    public float _lerpRate = 0.64f;
    private float _xRotation;
    private float _yYRotation;


    private void Rotate(float xMovement, float yMovement)
    {
        _xRotation += xMovement;
        _yYRotation += yMovement;
    }

    void Update()
    {
        //if(!EventSystem.current.IsPointerOverGameObject())
        if(EventSystem.current.IsPointerOverGameObject(Input.touches[0].fingerId))
        {

        }
        else
        {           
        _xRotation = Mathf.Lerp(_xRotation, 0, _lerpRate);
        _yYRotation = Mathf.Lerp(_yYRotation, 0, _lerpRate);
        transform.eulerAngles += new Vector3(0, _xRotation, -_yYRotation);

        }

    }