有状态小部件上的dispose函数不执行与块相关的消耗代码

问题描述

我们正在使用 bloc_pattern 2.5.1 包在Flutter应用程序中实现Bloc状态管理，但是，变量会继续存储数据，并且即使在屏幕上，bloc文件也不会静止被dispose of function处置，不知道发生了什么事。

离开与欧盟相关联的屏幕后，如何恢复值

import 'package:bloc_pattern/bloc_pattern.dart';
import 'package:rxdart/rxdart.dart';
import 'package:save_kids/models/child.dart';
import 'package:save_kids/models/parent.dart';
import 'package:save_kids/models/timer.dart';
import 'package:save_kids/services/repository.dart';

class EditChildProfileBloc extends BlocBase {
  EditChildProfileBloc() {
    _imageAvatar.sink.add(avatars[0]);
    _timer.sink.add(timers[0]);
    _isValidated.add(false);
  }
  Repository _repository = Repository<Child>(collection: 'children');
  final _childName = BehaviorSubject<String>();
  final _age = BehaviorSubject<String>();
  final _imageAvatar = BehaviorSubject<String>();
  final _timer = BehaviorSubject<Timer>();
  final _isValidated = BehaviorSubject<bool>();
  final _childId = BehaviorSubject<String>();

  Function(String) get changeChildId => _childId.sink.add;
  Function(String) get changeChildName => _childName.sink.add;
  Function(Timer) get changeTimer => _timer.sink.add;
  Function(String) get changeAge => _age.sink.add;
  Function(String) get changeImageAvatar => _imageAvatar.sink.add;
  Function(bool) get showProgressBar => _isValidated.sink.add;

  Stream<String> get childId => _childId.stream;
  Stream<String> get childName => _childName.stream;
  Stream<String> get age => _age.stream;
  Stream<String> get imageAvatar => _imageAvatar.stream;
  Stream<Timer> get timer => _timer.stream;
  Stream<bool> get validatedStatus => _isValidated.stream;
  // Function(bool) get changeEditMode => _isEditMode.sink.add;
  // Stream<bool> get editMode => _isEditMode.stream;
  Stream<Parent> get parentSession => _repository.authSession;

  bool validateSignInFields() {
    if (_childName.value != null && _childName.value.isNotEmpty) {
      return true;
    } else {
      return false;
    }
  }

  Future<Child> setChild(String parentId,String type) async {
    Child child = Child(
      name: _childName.value,type: type,parentId: parentId,imagePath: _imageAvatar.value,age: _age.value,timer: _timer.value,);
    _timer.sink.add(timers[0]);
    return await _repository.setDocument(child,_childId.value);
  }

  @override
  void dispose() async {
    await _childName.drain();
    _childName.close();
    await _childId.drain();
    _childId.close();
    await _age.drain();
    _age.close();
    await _timer.drain();
    _timer.close();
    await _imageAvatar.drain();
    _imageAvatar.close();
    super.dispose();
  }
}

解决方法

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