Flutter 错误：找不到正确的 ScopedModel

Question

我正在尝试在我的 flutter 项目中创建一个范围模型，但我似乎无法弄清楚为什么会出现错误。这个作用域模型实现有什么问题？我有一个带有底部导航器的主页。在个人资料选项卡中，我在树深处的小部件中获取了我需要的关注者列表，因此我尝试使用scopedmodel。

型号代码是

class RelationshipsModel extends Model {
        List<Relationship> relations;
        RelationshipsModel(this.relations);
        void add(String name) {
            relations.add(new Relationship("", "", name, name));
            notifyListeners();
      }
    }

创建作用域模型的配置文件页面如下。在这里，我从该州的 Firebase 获取关注者列表，并使用它来创建作用域模型的模型。

 class ProfileWidget extends StatefulWidget {
      @override
      _ProfileWidgetState createState() => _ProfileWidgetState();
    }

class _ProfileWidgetState extends State<ProfileWidget> {
@override
  initState() {
    super.initState();
    getCurrentUserDetails();
  }
getCurrentUserDetails() async {
_name = await CacheService.getCurrentUser();
var following = await service.getFollowingList(_name);
setState(() {
      this._following = following;
    });
  }

 @override
  Widget build(BuildContext context) {
    if (this._name == null) {
      return new Container(
        child: const CupertinoActivityIndicator(),
      );
    }

return  ScopedModel<RelationshipsModel>(
        model: RelationshipsModel(this._following),
        child: Scaffold(
       //more stuff

         background: new Stack(children: <Widget>[
                  new CarouselWidget(),
                  new Align(
                    alignment: FractionalOffset.topCenter,
                    heightFactor: 6.0,
                    child: new Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        //Here I am creating the a widget that shows the list of followers and following
                        new FollowerInfoWidget(followers: this._followers,
                            following: this._following),
                      ],
                    ),
                  ),
                ])),


     )
   );
  }
}

下面是 FollowerInfoWidget，它根据列表中单击的用户调用 ProfileWidget 或 UserWidget

 class _FollowerState extends State<FollowerWidget> {

  Widget buildListTile(BuildContext context, Relationship item) {
    return new MergeSemantics(
      child: new ListTile(

        title: new Text(item.followerId),
        onTap: () async {
          if (item.followerId == await CacheService.getCurrentUser()) {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => ProfileWidget()),
            );
          }
          else {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) =>
                  UserWidget(name: item.followerId)),
            );
          }
        },
        trailing: new Icon(Icons.info, color: Theme.of(context).disabledColor),
      ),
    );
  }

FollowUnFollowWidget 按钮是 UserWidget 的一部分

    class UserWidget extends StatefulWidget {
  UserWidget(
      {Key key})
      : super(key: key);
  @override
  _UserWidgetState createState() => _UserWidgetState();
}

class _UserWidgetState extends State<UserWidget> {
@override
  Widget build(BuildContext context) {
return Scaffold(
      body: DefaultTabController(
//more stuff
 new FollowerInfoWidget(
                              followers: this._followers,
                              following: this._following,
                            ),
                            new FollowUnFollowWidget ()

具有 ScopedModelDescendant 的小部件如下

class FollowUnFollowWidget extends StatelessWidget {  
  @override
  Widget build(BuildContext context) {
    return ScopedModelDescendant<RelationshipsModel>(
        builder: (context, child, model) =>
            FloatingActionButton(
            onPressed: () {}
           //more stuff
       )
    );
  }
}

Answer 1

这里的代码将推送一个视图，它是 aProfileWidget或 aUserWidget

onTap: () async {
      if (item.followerId == await CacheService.getCurrentUser()) {
        Navigator.push(
          context,
          MaterialPageRoute(builder: (context) => ProfileWidget()),
        );
      }
      else {
        Navigator.push(
          context,
          MaterialPageRoute(builder: (context) =>
              UserWidget(name: item.followerId)),
        );
      }
    },

由于没有上面的内容，所以使用UserWidget是行不通的。这仅由以下定义FollowUnFollowWidgetScopedModelDescendantScopedModelScopedModelProfileWidget

看起来您需要将其添加ScopedModel到构建方法的顶部UserWidget或作为其一部分buildListTile