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将 ViewModel 绑定到各个界面

将共享状态连接到 Compose 和 SwiftUI

第 4 / 4 课13 个步骤

将 ViewModel 绑定到各个界面 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。这是第 4 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。

The Last Mile

Your shared ViewModel is ready. Now each native UI just needs to observe its state and forward user intents. That is the final wiring.

Compose Collects State

On Android, use collectAsState to turn the StateFlow into Compose state. Every emission recomposes the screen automatically.

val state by viewModel.state.collectAsState()

Draw from That State

Your composable reads the collected state and renders it. The UI is now a pure function of the shared ViewModel's output.

Text(state.name)
if (state.isLoading) CircularProgressIndicator()

Send Intents from Compose

Wire a button to onIntent. The user taps, Compose forwards the action, and the shared ViewModel decides what to do.

Button(onClick = {
    viewModel.onIntent(HomeIntent.Refresh)
}) { Text("Refresh") }

iOS Needs a Bridge

SwiftUI cannot collect a Kotlin Flow directly. A tiny observable wrapper bridges StateFlow into something SwiftUI can watch.

An ObservableObject Wrapper

Wrap the ViewModel in a Swift ObservableObject. It holds a published copy of the state and feeds SwiftUI updates.

class HomeObservable: ObservableObject {
    @Published var state = HomeState(isLoading: false, name: "")
}

Collect the Flow in Swift

Inside the wrapper, collect the Kotlin StateFlow and assign each value to the published property. SkieKit can also generate this for you.

Render in SwiftUI

The SwiftUI view observes the wrapper and reads state the same way. One shared truth, drawn in Apple's native style.

Text(observable.state.name)

Send Intents from Swift

Buttons in SwiftUI call the wrapped ViewModel's onIntent too, so iOS taps flow into the exact same shared logic.

Button("Refresh") {
    observable.viewModel.onIntent(intent: .refresh)
}

Clear on Disappear

When a screen closes, call the ViewModel's clear() from each platform's lifecycle so the scope cancels and nothing leaks.

Same Brain, Two Faces

Both apps now share one ViewModel: identical state, identical decisions, only the rendering differs. That is KMP at its best. 🎉

Quick Check

Let's confirm how SwiftUI consumes a shared StateFlow.

在交互式课程中回答

Recap

Compose uses collectAsState; SwiftUI uses an ObservableObject wrapper. Both observe state and send intents to one shared ViewModel. 🚀

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常见问题解答

「将 ViewModel 绑定到各个界面」课时是免费的吗？

是的 — 「将 ViewModel 绑定到各个界面」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。

「将 ViewModel 绑定到各个界面」这节课中我会学到什么？

将共享状态连接到 Compose 和 SwiftUI 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。

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「将 ViewModel 绑定到各个界面」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。

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