常见错误与编译器错误
修复典型的“没有 actual 声明”失败问题
常见错误与编译器错误 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。
Errors Are Your Friend
expect/actual mistakes surface at compile time, never as silent runtime bugs. Learning the messages makes fixing them fast. 🛠️
No actual Declaration
The most common error is forgetting an actual for one target. The compiler says expected declaration has no actual for that platform.
Fix the Missing actual
Add the implementation in the right source set, like iosMain. Once every target has its actual, the build goes green.
actual fun platform(): String = "iOS"Signature Mismatch
If your actual changes the return type or parameters, the compiler reports that the actual does not match the expect. Align them exactly.
Forgetting the actual Keyword
An implementation without the actual keyword looks like a separate function to the compiler, so it still complains the expect is unfulfilled.
Wrong Source Set
Putting an actual in the wrong folder means a target still has no match. Each actual must sit in its platform's source set.
Package Must Match
The actual has to share the exact package of its expect. A mismatched package leaves the expect looking unimplemented.
package com.app.coreImporting Platform Types in Common
Using Android's Build or iOS UIDevice inside commonMain fails to resolve. Keep platform imports inside their own source sets only.
Default Args Belong on expect
Declare default parameter values on the expect, not the actual. Repeating defaults on an actual triggers a compiler error.
Read the Message Carefully
Kotlin's errors usually name the exact target and member. Treat the message as a checklist and the fix is almost always obvious. 💡
Build All Targets
Compile every target, not just Android. An iOS-only gap stays hidden until you build the iOS framework as well.
Quick Check
Spot the cause of the classic error.
Recap
You can now diagnose the usual expect/actual failures: a missing actual, a signature or package mismatch, or a platform import in common code. 🎉
常见问题解答
「常见错误与编译器错误」课时是免费的吗？
是的 — 「常见错误与编译器错误」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。
「常见错误与编译器错误」这节课中我会学到什么？
修复典型的“没有 actual 声明”失败问题 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 4 节课，共 4 节。
「常见错误与编译器错误」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。