unity隐藏侧边栏效果

下面展示一些 内联代码片。
public RectTransform mainUI;
public Button showHideBtn;
//public RepeatButton dragBtn;
private bool m_isShow;
public Sprite[] sideIcon;

// Use this for initialization
void Start()
{
    m_isShow = true;
    showHideBtn.GetComponent<Image>().sprite = sideIcon[0];
    showHideBtn.onClick.AddListener(ShowHide);
}
void ShowHide()
{
    Vector3 vec3Tmp = mainUI.anchoredPosition;
    
    if (m_isShow)
    {
        showHideBtn.GetComponent<Image>().sprite = sideIcon[1];
        mainUI.DOAnchorPos(new Vector2(-vec3Tmp.x, vec3Tmp.y), 1.0f);
        m_isShow = false;
    }
    else
    {
        showHideBtn.GetComponent<Image>().sprite = sideIcon[0];
        mainUI.DOAnchorPos(new Vector2(-vec3Tmp.x, vec3Tmp.y), 1.0f);
        m_isShow = true;
    }
}

ps：注意侧边框锚点在父节点的位置。