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dart - flutter 错误 : Could not find the correct ScopedModel

转载 作者:IT老高 更新时间:2023-10-28 12:40:47 24 4
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我正在尝试在我的 flutter 项目中创建一个作用域模型,但我似乎无法弄清楚为什么会出现错误。这个 scopedmodel 实现有什么问题?我有一个带有底部导航器的主页。在配置文件选项卡中,我在树深处的小部件中获取我需要的关注者列表,因此我尝试使用 scopedmodel。

型号代码为

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 Firebase 获取状态中的关注者列表,并使用它为 scopedmodel 创建模型。

 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),
],
),
),
])),


)
);
}
}

FollowerInfoWidget 在下面,它根据列表中点击的用户调用 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 ()

并且具有 ScopedModelDescendant 的小部件在下面

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

最佳答案

这里的代码将推送一个 View ,该 View 是 ProfileWidgetUserWidget

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 UserWidget 具有 FollowUnFollowWidget,因此无法使用 ScopedModelDescendant,因为它上面没有 ScopedModel .此 ScopedModel 仅使用 ProfileWidget

定义

看起来您需要将 ScopedModel 添加到 UserWidget 的构建方法的顶部或作为 buildListTile

关于dart - flutter 错误 : Could not find the correct ScopedModel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51941568/

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