Unity 世界坐标转UI

/// <summary>
    /// 更新坐标
    /// </summary>
    private void UpdatePosition()
    {
        transform.localPosition = WorldPointToUILocalPoint(target.position+offset) ;
        cachePoint = target.position+ offset;
    }
    /// <summary>
    /// 世界坐标转换为ui坐标
    /// </summary>
    /// <param name="point"></param>
    /// <returns></returns>
    private Vector3 WorldPointToUILocalPoint(Vector3 point)
    {
        Vector3 screenPoint = Camera.main.WorldToScreenPoint(point);
        Vector2 localPoint;
        RectTransformUtility.ScreenPointToLocalPointInRectangle((RectTransform)canvas.transform, screenPoint, uiCamera, out localPoint);
        return localPoint;
    }