Widget _buildLoadingSideBar(BuildContext context) {
    // 延迟加载
    Future.delayed(const Duration(seconds: 3), _initData);
    var size = MediaQuery.of(context).size;
    var demoHeight = size.height;

    return Row(
      children: [
        SizedBox(
          width: list.isEmpty ? size.width : 110,
          child: TDSideBar(
            height: demoHeight,
            style: TDSideBarStyle.normal,
            value: currentValue,
            controller: _sideBarController,
            loading: true,
            children: list
                .map((ele) => TDSideBarItem(
                    label: ele.label ?? '',
                    badge: ele.badge,
                    value: ele.value,
                    icon: ele.icon))
                .toList(),
            onChanged: onChanged,
            onSelected: onSelected,
          ),
        ),
        Expanded(
            child: SizedBox(
          height: demoHeight,
          child: SingleChildScrollView(
            controller: _demoScroller,
            child: Column(
              children: pages,
            ),
          ),
        ))
      ],
    );
  }