Question

我喜欢Flutter热重装，但发现BLoC中的状态没有保持。每次我进行热装时，它都会重置。

有没有一种方法可以保存该状态，使其在热重载后仍然存在？（我可以挂断电话吗？）

感谢您的时间！

Answer 1

@RémiRousselet出现了！我将状态保持在有状态小部件之外！为了清楚起见，这是之前和之后的代码。（MaterialApp home：参数和_MyHomePageState.build是真正的更改所在的位置）

错误代码：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: BlocProvider<PandemicBloc>(
          bloc: PandemicBloc(), child: MyHomePage(title: 'Pandemic Tracker')),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final PandemicBloc pandemicBloc = BlocProvider.of<PandemicBloc>(context);
  int _currentTab = 0;

  Widget build(BuildContext context) {
    return DefaultTabController(...

好的代码：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Pandemic Tracker'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _currentTab = 0;
  final _pandemicBloc = PandemicBloc();

  Widget build(BuildContext context) {
    return BlocProvider<PandemicBloc>(
      bloc: _pandemicBloc,
      child: DefaultTabController(...

如何在Flutter Hot Reload上保持BLoC状态？

1 个答案: