Kotlin Coroutines Meet Swift 6 Concurrency: Bidirectional Async Interop Patterns in KMP That Actually Work

--- title : " Kotlin Coroutines Meet Swift 6 Concurrency in KMP: Async Interop That Actually Works" published : true description : " A practical walkthrough of bridging Kotlin coroutines to Swift async/await in KMP — SKIE vs KMP-NativeCoroutines, cancellation propagation, and the MainActor deadlock trap." tags : kotlin, swift, mobile, architecture canonical_url : https://blog.mvpfactory.co/kotlin-coroutines-meet-swift-6-concurrency-in-kmp --- ## What We Will Build By the end of this tutorial, you will have a working pattern for bridging Kotlin coroutines to Swift's async/await in a KMP shared module. I will walk you through choosing between SKIE and KMP-NativeCoroutines, wiring up cancellation propagation, and bridging `Flow` to `AsyncSequence` . More importantly, I will show you the MainActor deadlock that catches teams in production. ## Prerequisites - A KMP project targeting iOS (Kotlin 1.9.20+ recommended) - Xcode 15+ with Swift 6 strict concurrency enabled - Familiarity with Kotli