Question

我更新了提供商。现在不起作用

lib / di / global_providers.dart：13：6：错误：找不到类型'SingleChildCloneableWidget'。列出globalProviders = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib / di / global_providers.dart：18：6：错误：找不到类型'SingleChildCloneableWidget'。列出dependentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib / di / global_providers.dart：23：6：错误：找不到类型'SingleChildCloneableWidget'。列出dependentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib / main.dart：18：16：错误：无法将参数类型“列表”分配给参数类型“列表”。 -“列表”来自“ dart：core”。 -'SingleChildWidget'来自'package：nested / nested.dart'（'../../flutter/.pub-cache/hosted/pub.dartlang.org/nested-0.0.4/lib/nested.dart' ）。提供者：globalProviders， ^ lib / di / global_providers.dart：13：6：错误：“ SingleChildCloneableWidget”不是类型。列出globalProviders = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib / di / global_providers.dart：18：6：错误：“ SingleChildCloneableWidget”不是类型。列出dependentServices = [ ^^^^^^^^^^^^^^^^^^^^^^^^^^^ lib / di / global_providers.dart：23：6：错误：“ SingleChildCloneableWidget”不是类型。列出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

来自提供商v4.0.0

SingleChildCloneableWidget接口已被删除，并由SingleChildWidget接口和两个实现取代：

SingleChildStatelessWidget
SingleChildStatefulWidget

MultiProvider将接受SingleChildWidget而不是SingleChildCloneableWidget。

在GitHub上查看此issue。

Answer 2

试试

import 'package:provider/single_child_widget.dart';

并替换

List<SingleChildCloneableWidget> independentServices

与

List<SingleChildWidget> independentServices

它有效。我已与依赖项提供程序核对：^4.3.2+3

Answer 3

首先，我不建议您这样做。考虑直接在您的MultiProvider内部创建此列表。

做您当前正在做的事情会增加不必要的复杂性和仪式，而没有真正的好处。实际上，您实际上正在降低可测试性。

但是，如果您坚持要这样做，那么自述文件就很清楚了：

用SingleChildWidget替换SingleChildCloneableWidget（来自provider / single_child_widget.dart）

错误：在提供程序包中找不到类型“ SingleChildCloneableWidget”

3 个答案: