Bridging Kotlin Coroutines and Swift Concurrency in KMP: What Actually Works in Production

--- title : " Bridging Kotlin Coroutines and Swift Concurrency in KMP" published : true description : " Production-tested patterns for exposing Kotlin Flow and suspend functions to Swift 6 — SKIE vs manual wrappers, cancellation, and memory pitfalls." tags : kotlin, swift, ios, mobile canonical_url : https://blog.mvpfactory.co/bridging-kotlin-coroutines-and-swift-concurrency-in-kmp --- ## What We Are Building Let me show you the patterns I use in every KMP project to bridge Kotlin coroutines into Swift structured concurrency — without leaking coroutines, dropping signals, or fighting `@MainActor` isolation. By the end, you will know when to reach for SKIE, when to write manual wrappers, and how to avoid the cancellation bugs that account for a shocking number of iOS-side crashes. ## Prerequisites - A Kotlin Multiplatform project targeting iOS - Familiarity with Kotlin `Flow` and `suspend` functions - Basic Swift concurrency knowledge ( `async/await` , `Task` ) - Xcode 15+ with Swift 5.