声明共享 Koin 模块
在 commonMain 中注册依赖项
声明共享 Koin 模块 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Kotlin Multiplatform Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Kotlin Multiplatform Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Why Wire Things Together
Your app is full of objects that need each other: a repository needs a client, a use case needs the repository. Dependency injection hands those pieces over for you.
Meet Koin
Koin is a lightweight DI library written in pure Kotlin, so it runs happily in commonMain and works on both Android and iOS. 🎉
Add the Dependency
You pull Koin into your shared module the same way you add any other library, listing the core artifact in your version catalog or build file.
implementation("io.insert-koin:koin-core:3.5.0")A Module Is a Recipe Book
A Koin module is just a list of recipes telling Koin how to build each dependency. You declare it once and reuse it everywhere.
Write Your First Module
The module { } builder collects your definitions. An empty one is valid; you fill it with recipes next.
val appModule = module {
}Register with single
Inside the module, single { } registers one shared instance Koin reuses for the whole app, perfect for a repository.
val appModule = module {
single { UserRepository() }
}Wire Dependencies with get
When one object needs another, call get() inside the recipe. Koin looks up the matching definition and passes it in automatically.
single { UserRepository(api = get()) }Order Does Not Matter
You can declare definitions in any order. Koin resolves the graph lazily, so a recipe can safely get() something defined further down.
Keep It in commonMain
Because Koin is multiplatform, place appModule in commonMain. Both your Android and iOS apps then share the exact same wiring.
Group Related Modules
Large apps split definitions into several modules, like a data module and a domain module, then combine them later when starting Koin.
val dataModule = module { single { ApiClient() } }A Function That Returns It
A common pattern exposes your module from a function, making it easy for each platform to grab the shared definition.
fun appModule() = module {
single { UserRepository(get()) }
}Quick Check
Let's lock in what a Koin module does.
Recap
You met Koin, added it to your shared module, and wrote a module that registers dependencies with single and links them using get. One recipe book, both platforms. 🚀
常见问题解答
「声明共享 Koin 模块」课时是免费的吗？
是的 — 「声明共享 Koin 模块」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Kotlin Multiplatform Academy 课程的其余内容，请升级到 CoddyKit PRO。 Kotlin Multiplatform Academy 课程共包含 4 节课。
「声明共享 Koin 模块」这节课中我会学到什么？
在 commonMain 中注册依赖项 你通过在浏览器中直接运行的动手代码来练习 Kotlin Multiplatform Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Kotlin Multiplatform Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Kotlin Multiplatform Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。
「声明共享 Koin 模块」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Kotlin Multiplatform Academy 课中编写并运行代码吗？
能。每节 Kotlin Multiplatform Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。