Widget _verticalIconToast(BuildContext context) {
    return TDButton(
      onTap: () {
        TDToast.showIconText('带竖向图标',
            icon: TDIcons.check_circle,
            direction: IconTextDirection.vertical,
            context: context);
      },
      size: TDButtonSize.large,
      type: TDButtonType.outline,
      theme: TDButtonTheme.primary,
      isBlock: true,
      text: '带竖向图标',
    );
  }