从 Swift 收集 Flow
将 StateFlow 安全地接入 SwiftUI，避免泄漏
从 Swift 收集 Flow 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。 这是第 3 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。
Flows Are Trickier
A Kotlin Flow emits many values over time. Swift has no built-in way to collect it, so you need a small bridge.
val users: StateFlow<List<User>>Why Not Just Await
Await fits a single result, but a Flow is a stream. You must keep listening, which means collecting inside a coroutine.
Expose a Collect Helper
A common pattern is a shared helper that takes a callback and collects the Flow, calling Swift each time a value arrives.
fun watch(onEach: (User) -> Unit)Wrap in ObservableObject
On the Swift side, an ObservableObject holds the latest value as a published property so SwiftUI redraws on each emission.
class UserStore: ObservableObject {
@Published var users = []
}Start Collecting
When the wrapper appears, call the shared watch helper and assign each emitted value to the published property.
repo.watch { self.users = $0 }Keep the Job
The collect helper returns a cancellation handle. Store that job so you can stop the stream when the view goes away.
Cancel on Disappear
In onDisappear, call cancel on the saved job so the coroutine stops and you avoid a leaked, forever-running collector.
job.cancel()StateFlow Has a Value
A StateFlow always holds a current value, so Swift can read its initial state immediately before any new emissions arrive.
Threading Matters
Make sure each value reaches Swift on the main thread, since updating SwiftUI state off the main thread causes problems.
Let SKIE Do It
The library SKIE turns Flows into Swift AsyncSequence, so you can for-await over them and skip writing manual collectors.
One Stream, Live UI
With the bridge in place, your shared Flow drives SwiftUI live: every emission updates the screen, just like on Android.
Quick Check
Let us confirm the safe way to consume a Flow from Swift.
Recap
Bridge a Flow to Swift with a collect helper plus an ObservableObject, update on the main thread, and cancel the job to avoid leaks. 🚀
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常见问题解答
「从 Swift 收集 Flow」课时是免费的吗？
是的 — 「从 Swift 收集 Flow」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。
「从 Swift 收集 Flow」这节课中我会学到什么？
将 StateFlow 安全地接入 SwiftUI，避免泄漏 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 3 节课，共 4 节。
「从 Swift 收集 Flow」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。