跨平台调度器
选择 Android 和 iOS 都存在的调度器
跨平台调度器 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。 这是第 2 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。
Where Work Actually Runs
A coroutine still runs on some thread. A dispatcher decides which thread or pool it uses, and that choice matters on each platform.
Meet Dispatchers.Default
Use Dispatchers.Default for CPU-heavy work like parsing or sorting. It exists on Android and iOS, so shared code can rely on it.
withContext(Dispatchers.Default) { sort(data) }Dispatchers.Main for UI
Dispatchers.Main runs on the platform UI thread. It is available in common code, but only update screens from here.
withContext(Dispatchers.Main) { render(state) }The IO Dispatcher Gap
Watch out: Dispatchers.IO exists on the JVM and Android but not in plain common code on every target. Do not assume it is everywhere.
Stay in Common-Safe Land
For portable shared logic, prefer Default and Main. They are guaranteed across the targets KMP commonly supports.
Switching with withContext
You move work between threads using withContext. Compute on Default, then hop to Main to publish the result, all in one function.
val r = withContext(Dispatchers.Default) { heavy() }Dispatchers Are Pluggable
A dispatcher is just a CoroutineContext element. You can pass one in, which makes shared code easy to configure and test.
class Loader(val io: CoroutineDispatcher)Inject for Testability
Passing the dispatcher in lets tests swap a deterministic one. Hard-coding it makes shared async logic harder to test. 🧪
iOS Runs Them Too
On iOS these dispatchers map onto the right native queues automatically. Your shared code does not care about GCD details.
One Choice, Both Platforms
Because the dispatcher names are common, the same line schedules work correctly on Android and iOS. No platform branches in your logic. ✨
Pick the Right Tool
Rule of thumb: Default for computation, Main for UI updates, and inject anything IO-like so it stays portable. 🎯
Quick Check
Pick the dispatcher choice that is safest for shared KMP code.
Recap
You learned to pick dispatchers wisely: Default for computation, Main for UI, and inject IO-style ones since they are not on every target. 🎉
常见问题解答
「跨平台调度器」课时是免费的吗？
是的 — 「跨平台调度器」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。
「跨平台调度器」这节课中我会学到什么？
选择 Android 和 iOS 都存在的调度器 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 2 节课，共 4 节。
「跨平台调度器」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。