Flutter Provider 不重建小部件

Question

这是我的一段代码，但请在下结论之前阅读问题：

class RescheduleCard extends StatelessWidget {

@override
  Widget build(BuildContext context)=> Consumer<AppSnapshot>(
    builder: (context, appSnapshot, _)=>
    (appSnapshot.reschedule!=null)
    ?RescheduleBuilder(
          model: appSnapshot.reschedule,
          controllers: appSnapshot.controllers,
        )
    :Carouselcard(
      title:  carouselPageTitle(title: rescheduleTitle,test: appSnapshot.test),
      colors: yellows,

所以我对提供者有点陌生，而且我已经习惯了 Bloc，我的 api 一旦接到供应商的电话并设置模型；

编辑：这里是提供者 256 行被绊倒的问题 "reschedule"...

class AppSnapshot with ChangeNotifier {

  RescheduleModel _reschedule;
  RescheduleModel get reschedule => _reschedule;

  void cleanReschedule() {
    reschedule=null;
    notifyListeners();
  }

  set reschedule(RescheduleModel reschedule) {
    _reschedule=reschedule;
    notifyListeners();
  }
}

重新编辑：最重要的是：

void main() async {
  final AppSnapshot _appSnapshot = AppSnapshot();
  await _appSnapshot.load();
  runApp(ChangeNotifierProvider(
          builder: (context) => _appSnapshot,
          child: Initializer()));
}

我期待 "Consumer" 重建我的小部件，但没有！

我确定数据在那里，因为小部件在轮播中一旦我移动它，它就会正确重建。

我错过了什么？谢谢

re-re-edit：这是另一个 Carousel Card 的示例，其中提供者工作迅速并且实时应用更改

 Consumer<AppSnapshot>(
    builder: (context, appSnapshot, _)=> Carouselcard(
      title: carouselPageTitle(title: optionsTitle,test: appSnapshot.test),
      colors: lightBlues,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: <Widget>[
          ((appSnapshot.id??'')!='')                                                        // ID WIDGET
            ? ListTile(
              leading: CustomIcon(
                icon: deleteIcon,
                onTap: () => appSnapshot.deleteID(),
              ),
              title: _customCard(onTap:()=> _showID(id: appSnapshot.id,context: context)),
              subtitle: Text(tap2delete,textScaleFactor:0.8),
            )
            : IdTile(),

Answer 1

指定 main.dart 中的类型

void main() async {
final AppSnapshot _appSnapshot = AppSnapshot();
await _appSnapshot.load();
runApp(ChangeNotifierProvider< **AppSnapshot** >(
      builder: (context) => _appSnapshot,
      child: Initializer()));
}

Answer 2

根据这个 article FutureProvider 不会监听变化，它只会重建 Consumers 1 次，当 Future 完成时。

文章甚至解释了作者是如何测试的。

Dart Provider 包的开发者也用于 FutureProvider。

Flutter Provider 不重建小部件

Flutter Provider doesn't rebuild widget

flutter

dart

flutter-provider