lizhuoyuan/flutter_rxdart

flutter中用rxdart实现状态管理,主题切换

flutter_state

flutter 状态管理

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flutter_rxdart's Issues

您好，如何持久化主题状态呢？

退出app后再打开会恢复到日间主题，我尝试使用SharedPreferences来储存一个bool值来记录主题，想要在app初始化的main方法里进行如下处理：

var themeBloc;
void main() async {

  getLoginInfo();
  // await checkChina();

  runApp(BlocProvider(child: App()));

  initTheme();
  SystemUiOverlayStyle systemUiOverlayStyle =
      SystemUiOverlayStyle(statusBarColor: Colors.transparent);
  SystemChrome.setSystemUIOverlayStyle(systemUiOverlayStyle);
}

void initTheme() async {
  SharedPreferences sp = await SharedPreferences.getInstance();
  sp.getBool("isNight");
  print(sp.getBool("isNight"));

  themeBloc.changeTheme(sp.getBool("isNight"));
}

出现如下报错：

出现异常。
NoSuchMethodError (NoSuchMethodError: The method 'changeTheme' was called on null.
Receiver: null
Tried calling: changeTheme(true))

sp.getBool("isNight")是有值的， themeBloc.changeTheme方法来自于源码如下：

import 'package:rxdart/rxdart.dart';

class ThemeChangeBloc {
  bool _isNight = true;

  var _subject = BehaviorSubject<bool>();

  Stream<bool> get isNight => _subject.stream;

  void changeTheme(bool value) => _subject.add(_isNight = value);

  void disposed() {
    _subject.close();
  }
}

我技术比较垃圾，希望您在工作之余闲暇之时为我解惑，不胜感激。