Kotlin Multiplatform Academy · 课时

从 Kotlin 使用 Apple 框架

直接访问 platform.Foundation 及相关框架

从 Kotlin 使用 Apple 框架 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。

Apple APIs, in Kotlin

Kotlin/Native ships with ready-made bindings for Apple platforms. From iosMain you can call Foundation, UIKit and more directly in Kotlin. 🍎

The platform Packages

Every Apple framework lives under a platform package. Import platform.Foundation, platform.UIKit, or platform.CoreLocation just like any Kotlin package.

import platform.Foundation.NSDate
import platform.UIKit.UIDevice

A First Foundation Call

Try NSDate. Creating one gives you the current moment, exactly as Swift would, but the code stays in your shared iosMain source set.

val now = NSDate()
println(now.description())

UIKit Without Leaving Kotlin

Need the device name or OS version? UIDevice.currentDevice hands it over so platform code reads naturally in Kotlin.

val v = UIDevice.currentDevice.systemVersion
println("iOS " + v)

iosMain Is the Right Home

These bindings exist only on iOS targets. Put any Apple-framework call in iosMain, never in commonMain, or the Android build breaks.

Objective-C Becomes Kotlin

The Kotlin/Native compiler reads Apple headers and generates Kotlin signatures. An Objective-C class arrives as a normal Kotlin class you can construct.

Methods Map to Functions

Objective-C selectors turn into Kotlin functions. A long selector like stringWithFormat: becomes a tidy named function you call the usual way. ✨

Nullability Carries Over

Apple nullability annotations map to Kotlin types. A nullable Objective-C value becomes a Kotlin nullable type, so the compiler still guards you.

val url: NSURL? = NSURL.URLWithString("https://x.io")

Constants and Enums

Framework constants and enums come across too. An NSError domain string or an enum case is reachable straight from Kotlin code.

Versions and Availability

Bindings track an iOS SDK version. Newer Apple APIs only appear if your deployment target and SDK are recent enough to expose them.

Keep the Boundary Thin

Call Apple APIs in a small iosMain wrapper, then expose a clean Kotlin result. Hiding platform detail behind one function keeps shared code tidy.

Quick Check

A quick one on where Apple framework calls belong.

Recap: Apple from Kotlin

You saw that Kotlin/Native exposes Apple frameworks under platform packages, callable from iosMain with familiar Kotlin syntax. Keep them behind a thin wrapper. 🎉

常见问题解答

「从 Kotlin 使用 Apple 框架」课时是免费的吗？

是的 — 「从 Kotlin 使用 Apple 框架」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 Kotlin 使用 Apple 框架」这节课中我会学到什么？

直接访问 platform.Foundation 及相关框架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。

「从 Kotlin 使用 Apple 框架」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。

此课程中的所有课时

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