Widget _buildRefresh(BuildContext context) {
    return EasyRefresh(
      // 下拉样式
      header: TDRefreshHeader(),
      child: Column(
        children: [
          Container(
            height: 171,
            alignment: Alignment.center,
            decoration: BoxDecoration(
                color: TDTheme.of(context).grayColor1,
                borderRadius: BorderRadius.all(
                    Radius.circular(TDTheme.of(context).radiusLarge))),
            margin: const EdgeInsets.only(left: 16, right: 16),
            child: TDText(
              PlatformUtil.isWeb ? 'Web暂不支持下拉，请下载安装apk体验' : '拖拽该区域演示 顶部下拉刷新',
              font: TDTheme.of(context).fontBodyLarge,
              textColor: TDTheme.of(context).fontGyColor4,
            ),
          ),
          Container(
            height: 70,
            alignment: Alignment.center,
            decoration: BoxDecoration(
                color: TDTheme.of(context).grayColor1,
                borderRadius: BorderRadius.all(
                    Radius.circular(TDTheme.of(context).radiusLarge))),
            margin: const EdgeInsets.only(top: 16, left: 16, right: 16),
            child: TDText(
              '下拉刷新次数：${count}',
              font: TDTheme.of(context).fontBodyLarge,
              textColor: TDTheme.of(context).fontGyColor4,
            ),
          ),
        ],
      ),
      // 下拉刷新回调
      onRefresh: () async {
        await Future.delayed(const Duration(seconds: 2), () {
          setState(() {
            count++;
          });
        });
      },
    );
  }