@override
Widget build(BuildContext context) {
  return Column(
    children: <Widget>[
      Container(
        height: 45,
        child: Row(
          children: <Widget>[
            SizedBox(
              width: 30,
            ),
            Icon(
              Icons.notifications,
              color: Colors.blue,
            ),
            SizedBox(
              width: 30,
            ),
            Expanded(
              child: Text('消息中心'),
            ),
            Container(
              padding: EdgeInsets.symmetric(horizontal: 10),
              decoration: BoxDecoration(
                  shape: BoxShape.rectangle,
                  borderRadius: BorderRadius.all(Radius.circular(50)),
                  color: Colors.red),
              child: Text(
                '2',
                style: TextStyle(color: Colors.white),
              ),
            ),
            SizedBox(
              width: 15,
            ),
          ],
        ),
      ),
      Divider(),
      //类似上面的布局写6个
    ],
  );
}

或许说可以将每一个 Item封装为一个方法，写法如下：

_buildItem(IconData iconData, Color iconColor, String title, Widget widget) {
  return Container(
    height: 45,
    child: Row(
      children: <Widget>[
        SizedBox(
          width: 30,
        ),
        Icon(
          iconData,
          color: iconColor,
        ),
        SizedBox(
          width: 30,
        ),
        Expanded(
          child: Text('$title'),
        ),
        widget,
        SizedBox(
          width: 15,
        ),
      ],
    ),
  );
}

@override
Widget build(BuildContext context) {
  return Column(
    children: <Widget>[
      _buildItem(...),
      Divider(),
      _buildItem(...),
      Divider(),
      _buildItem(...),
      Divider(),
      _buildItem(...),
      Divider(),
      _buildItem(...),
      Divider(),
      _buildItem(...),
      Divider(),
    ],
  );
}

这样看起来好多了，基本解决了嵌套地狱问题，但这样写还存在一个非常大的问题-性能问题，一旦其中一个数字发生变化，整个页面都要重建，Flutter 开发中非常重要的一个原则就是 尽可能少的重建组件，因此将上面封装到方法中组件变为一个 Widget。

class SettingDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        _SettingItem(
          iconData: Icons.notifications,
          iconColor: Colors.blue,
          title: '消息中心',
          suffix: _NotificationsText(
            text: '2',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.thumb_up,
          iconColor: Colors.green,
          title: '我赞过的',
          suffix: _Suffix(
            text: '121篇',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.grade,
          iconColor: Colors.yellow,
          title: '收藏集',
          suffix: _Suffix(
            text: '2个',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.shopping_basket,
          iconColor: Colors.yellow,
          title: '已购小册',
          suffix: _Suffix(
            text: '100个',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.account_balance_wallet,
          iconColor: Colors.blue,
          title: '我的钱包',
          suffix: _Suffix(
            text: '10万',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.location_on,
          iconColor: Colors.grey,
          title: '阅读过的文章',
          suffix: _Suffix(
            text: '1034篇',
          ),
        ),
        Divider(),
        _SettingItem(
          iconData: Icons.local_offer,
          iconColor: Colors.grey,
          title: '标签管理',
          suffix: _Suffix(
            text: '27个',
          ),
        ),
      ],
    );
  }
}

class _SettingItem extends StatelessWidget {
  const _SettingItem(
      {Key key, this.iconData, this.iconColor, this.title, this.suffix})
      : super(key: key);

  final IconData iconData;
  final Color iconColor;
  final String title;
  final Widget suffix;

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 45,
      child: Row(
        children: <Widget>[
          SizedBox(
            width: 30,
          ),
          Icon(iconData,color: iconColor,),
          SizedBox(
            width: 30,
          ),
          Expanded(
            child: Text('$title'),
          ),
          suffix,
          SizedBox(
            width: 15,
          ),
        ],
      ),
    );
  }
}

class _NotificationsText extends StatelessWidget {
  final String text;

  const _NotificationsText({Key key, this.text}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.symmetric(horizontal: 10),
      decoration: BoxDecoration(
          shape: BoxShape.rectangle,
          borderRadius: BorderRadius.all(Radius.circular(50)),
          color: Colors.red),
      child: Text(
        '$text',
        style: TextStyle(color: Colors.white),
      ),
    );
  }
}

class _Suffix extends StatelessWidget {
  final String text;

  const _Suffix({Key key, this.text}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Text(
      '$text',
      style: TextStyle(color: Colors.grey.withOpacity(.5)),
    );
  }
}

封装为一个个单独的小组件，将有变化的组件尽量单独封装，这样就不会重建整个控件树，增强了可读性和可维护性，而且对性能有很大的提升。