Widget _buildColorSimple(BuildContext context) {
  var renderBox = navBarkey.currentContext?.findRenderObject() as RenderBox?;
  return TDButton(
    text: '自定义背景色',
    isBlock: true,
    type: TDButtonType.outline,
    theme: TDButtonTheme.primary,
    size: TDButtonSize.large,
    onTap: () {
      TDDrawer(
        context,
        visible: true,
        drawerTop: renderBox?.size.height,
        title: '标题',
        backgroundColor: TDTheme.of(context).grayColor1,
        placement: TDDrawerPlacement.right,
        items: List.generate(10, (index) => TDDrawerItem(title: '菜单${_nums[index]}')).toList(),
      );
    },
  );
}