Error: Type 'SingleChildCloneableWidget' not found in Provider package

Question

我更新了提供商。现在没用了

lib/di/global_providers.dart:13:6: Error: Type 'SingleChildCloneableWidget' not found. List globalProviders = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/di/global_providers.dart:18:6: Error: Type 'SingleChildCloneableWidget' not found. List independentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/di/global_providers.dart:23:6: Error: Type 'SingleChildCloneableWidget' not found. List dependentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/main.dart:18:16: Error: The argument type 'List' can't be assigned to the parameter type 'List'. - 'List' is from 'dart:core'. - 'SingleChildWidget' is from 'package:nested/nested.dart' ('../../flutter/.pub-cache/hosted/pub.dartlang.org/nested-0.0.4/lib/nested.dart'). providers: globalProviders, ^ lib/di/global_providers.dart:13:6: Error: 'SingleChildCloneableWidget' isn't a type. List globalProviders = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/di/global_providers.dart:18:6: Error: 'SingleChildCloneableWidget' isn't a type. List independentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^ lib/di/global_providers.dart:23:6: Error: 'SingleChildCloneableWidget' isn't a type. List dependentServices = [

代码

List<SingleChildCloneableWidget> globalProviders = [
  ...independentServices,
  ...dependentServices,
];

List<SingleChildCloneableWidget> independentServices = [
  Provider.value(value: YelloChatDb()),
  Provider.value(value: YelloChatClient()),
];

List<SingleChildCloneableWidget> dependentServices = [
  ProxyProvider<YelloChatDb, CategoryDao>(
      update: (context, yelloChatDb, categoryDao) => CategoryDao(yelloChatDb)),

  ProxyProvider<YelloChatDb, SubCategoryDao>(
      update: (context, yelloChatDb,subCategoryDao) => SubCategoryDao(yelloChatDb)),

  ProxyProvider<YelloChatDb, UserDao>(
    update: (context, yelloChatDb, userdAO) => UserDao(yelloChatDb),
  ),

  ProxyProvider<YelloChatDb, EnquiriesDao>(
    update: (context, yelloChatDb, enquiriesDao) => EnquiriesDao(yelloChatDb),
  ),

  ProxyProvider<YelloChatClient, CategoryService>(
      update: (context, yelloChatClient, categoryService) =>
          CategoryService.create(yelloChatClient.chopperClient),
      dispose: (context, categoryService) => categoryService.client.dispose()),


  ProxyProvider2<CategoryDao, CategoryService, CategoriesRepository>(
      update: (context, categoryDao, categoryService, categoryRepository) =>
          CategoriesRepository(categoryDao: categoryDao, categoryService: categoryService)),

  ProxyProvider2<UserDao, CategoryService, UserRepository>(
      update: (context, userDao, categoryService, categoryRepository)=>
          UserRepository(userDao: userDao, categoryService: categoryService)
  ),

  ProxyProvider2<SubCategoryDao, CategoryService, SubCategoriesRepository>(
      update: (context, subCategoryDao, categoryService, subCategoryRepository) =>
          SubCategoriesRepository(categoryDao: subCategoryDao, categoryService: categoryService)),

  ProxyProvider2<EnquiriesDao, CategoryService, EnquiriesRepository>(
      update: (context, enquiriesDao, categoryService, enquiriesRepository) =>
          EnquiriesRepository(enquriesDao: enquiriesDao, categoryService: categoryService))
];

Answer 1

首先，我不建议这样做。考虑直接在您的 MultiProvider 中创建此列表。

做您当前正在做的事情会增加不必要的复杂性和仪式感，而不会带来任何实际好处。事实上，你实际上是在降低可测试性。

如果您坚持这样做，自述文件对此非常清楚：

将 SingleChildCloneableWidget 替换为 SingleChildWidget（来自 provider/single_child_widget.dart）

Answer 2

来自 Provider v4.0.0

删除了 SingleChildCloneableWidget 接口，取而代之的是 SingleChildWidget 接口和两个实现：

SingleChildStatelessWidget
SingleChildStatefulWidget

MultiProvider 将接受 SingleChildWidget 而不是 SingleChildCloneableWidget.

在 GitHub 中查看此 issue。

Answer 3

试试

import 'package:provider/single_child_widget.dart';

并替换

List<SingleChildCloneableWidget> independentServices

和

List<SingleChildWidget> independentServices

有效。我已经与依赖提供者核实过：^4.3.2+3

Error: Type 'SingleChildCloneableWidget' not found in Provider package

Error: Type 'SingleChildCloneableWidget' not found in Provider package

flutter

dart

flutter-provider