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Kotlin Multiplatform

⬢ 層級 2技術
高
薪資影響
3 個月
學習時長
困難
難度
3
職業
一覽

Kotlin Multiplatform Mobile (KMM) lets you write business logic once in Kotlin, compile to JVM (Android), native (iOS), JavaScript (web). Mastery takes 8-10 weeks. Practitioners earn 30-40% premium because they reduce code duplication 50-70%. The 3% who architect multiplatform apps (shared domain, platform-specific UI) are highly valued in mobile teams.

什麼是 Kotlin Multiplatform

Kotlin Multiplatform is a feature in Kotlin allowing code to run on multiple platforms (iOS, Android, web, desktop) without modification. Write business logic once in Kotlin (shared module), platform-specific UI in native languages (Swift for iOS, Kotlin for Android, JavaScript for web). The architecture separates concerns: domain models, networking, persistence (shared), UI frameworks (platform-specific). Gradle builds native binaries for each platform using the Kotlin compiler's multiple backends (JVM for Android, native for iOS, JavaScript for web).

🔧 工具與生態
Kotlin languageKotlin MultiplatformGradle build systemKtor clientCoroutinesiOS native bindingsAndroid StudioXcode integration

💰 各地區薪資

地區初級中級高級
USA$90,000$160,000$240,000
UK£55,000£98,000£150,000
EU€60,000€108,000€160,000
CANADACA$95,000CA$165,000CA$250,000

🎯 使用 Kotlin Multiplatform 的職業

Fitness App Developer
Mobile Developer
Software Engineer

❓ 常見問題

When should I use Kotlin Multiplatform vs. React Native?
React Native: write UI in JavaScript. Kotlin Multiplatform: write business logic in Kotlin, native UI per platform. KMM is better for complex logic (financial calculations, encryption); React Native is better for UI-heavy apps. Both have trade-offs.
How does Kotlin compile to iOS?
Kotlin has multiple backends: JVM (Android), native (iOS/macOS, Clang-based), JavaScript (web). Shared code is common Kotlin; platform-specific code uses expect/actual. Compiler handles platform differences.
What's expect/actual?
expect = interface (abstract in common code). actual = implementation (platform-specific). Example: expect fun getDeviceId(): String. Android actual = read from SharedPreferences. iOS actual = read from Keychain.
Can I share UI code?
Not easily. UI depends on platform (UIKit, SwiftUI, Jetpack Compose, web frameworks). Share business logic (domain models, API clients), not UI.
What about performance?
Kotlin multiplatform: native compilation = performance matching native. No JavaScript overhead (like React Native). Native iOS and native Android performance.

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