flutter pub add koin基于插件公开信息、社区数据与项目使用情况整理的选型参考。
Koin 是一个轻量级、实用的 Dart 项目依赖注入（DI）框架，旨在简化应用程序中依赖项的管理。它提供了一种简洁明了的语法来定义和注入依赖项，促进模块化和可测试性。Koin 支持函数式和基于类的组件，使开发者能够轻松管理单例、工厂和作用域实例。通过极少的样板代码，它能无缝集成到 Flutter 和其他 Dart 应用程序中，非常适合构建可扩展且易于维护的代码库。
以下为关联源码仓库的 README 原文快照，最新内容请访问源码仓库。
An pragmatic and flexible lightweight dependency injection library. This is a port of Koin for Dart projects.
Written in pure Dart, using functional resolution only: no code generation, no reflection.
| Package | Pub |
|---|---|
| koin |  |
| koin_test |  |
| koin_flutter |  |
| koin_bloc |  |
| koin_devtools |  |
Allows to dispose your objects at the moment that you are no longer using them.
It does not depend on the Flutter.
Define in which scope a variable can be accessed.
Integration by default for Bloc library, but it can be easily used with any state management.
Koin DevTools to inspect the state of your objects.
Dependencies are instances only when needed.
It is not invasive.
Facilitates dependency injection by constructor
It is not a state manager. Koin does not have any type of state management, use koin with any state manager.
dependencies:
koin: ^[version]
dependencies:
koin: ^[version]
koin_flutter: ^[version]
// Given some classes
class Bloc {
final Repository service;
Bloc(this.service);
get state => "Hello";
}
class Repository {}
// just declare your providers(definitions)
final myModule = Module()
// Declare a single provider(definition) for Bloc class
..single((s) => Bloc(s.get()))
// Declare a single provider(definition) for Repository class
..single((s) => Repository());
Use the startKoin() function to start Koin in your application.
In a Dart app:
void main(List<String> args) {
startKoin((app){
app.module(myModule);
});
}
In an Flutter app:
void main() {
startKoin((app) {
app.module(homeModule);
});
runApp(MyApp());
}
class MyHomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
// Get a dependency
final bloc = get<Bloc>();
return Container(
child: Text("${bloc.state()}"),
);
}
}
dependencies:
koin: ^[version]
# Koin for Unit tests
dev_dependencies:
koin_test: ^[version]
dependencies:
koin: ^[version]
koin_flutter: ^[version]
# Koin for Unit tests
dev_dependencies:
koin_test: ^[version]
dependencies:
koin: ^[version]
koin_flutter: ^[version]
koin_bloc: ^[version]
# Koin for Unit tests
dev_dependencies:
koin_test: ^[version]
An simple example in Flutter. Code: Repository
A more elaborate example using Bloc library as a state management. Code: Repository
A application to demonstrate the Koin in a real world application.
Code: Repository
Koin DevTools allows you to inspect the internal state of the objects created by the providers(definitions).
Just insert the KoinDevTools Widget somewhere in your application or use showDevTools.
class Page extends StatefulWidget {
@override
_PageState createState() => _PageState();
}
class _PageState extends State<Page> {
@override
Widget build(BuildContext context) {
return Scaffold(
/// Just insert the KoinDevTools
endDrawer: KoinDevTools(),
body: IconButton(icon: Text('Shod DevTools'), onPressed: () {
// Or use this
showDevTools(context);
},),
);
}
}
Found a bug on a specific feature? Open an issue on Github issues
Want to help or share a proposal about Koin? problem on a specific feature?
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