TDButton _buildLoadingIconButton(BuildContext context) {
    return TDButton(
      text: '加载中',
      iconWidget: TDLoading(
        size: TDLoadingSize.small,
        icon: TDLoadingIcon.circle,
        iconColor: TDTheme.of(context).whiteColor1,
      ),
      size: TDButtonSize.large,
      type: TDButtonType.fill,
      shape: TDButtonShape.rectangle,
      theme: TDButtonTheme.primary,
    );
  }