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Swift Coroutines with
KMP-NativeCoroutines
Aleksander Jaworski @ FootballCo - 07.07.2023 Droidcon Berlin
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Aleksander Jaworski
- Android Developer @
FootballCo
- Blog akjaw.com
(Kotlin Multiplatform
and Testing)
- Twitter @akjaworski1
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What is Kotlin
Multiplatform?
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What is Kotlin
Multiplatform?
- One codebase,
different
platforms (iOS,
Desktop, Web)
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What is Kotlin
Multiplatform?
- One codebase,
different
platforms (iOS,
Desktop, Web)
- Kotlin has the
logic,platform
has the UI*
* Compose Multiplatform is a thing
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How to call Kotlin from Swift?
- Just call the generated Kotlin Multiplatform framework
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How to call Kotlin from Swift?
// Kotlin
fun execute() {
print("Exe")
}
- Just call the generated Kotlin Multiplatform framework
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How to call Kotlin from Swift?
// Kotlin
fun execute() {
print("Exe")
}
// Generated
open func execute()
- Just call the generated Kotlin Multiplatform framework
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How to call Kotlin from Swift?
// Kotlin
fun execute() {
print("Exe")
}
// Generated
open func execute()
// Swift
execute()
- Just call the generated Kotlin Multiplatform framework
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How to call coroutines
from Swift?
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How to call coroutines from Swift?
- It’s not so simple...
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// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
How to call coroutines from Swift?
- It’s not so simple...
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// Generated
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are
fatal.
open func execute(completionHandler:
@escaping (Error?) -> Void)
// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
How to call coroutines from Swift?
- It’s not so simple...
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// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
// Swift
execute { error in
print(error)
}
// Generated
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are
fatal.
open func execute(completionHandler:
@escaping (Error?) -> Void)
How to call coroutines from Swift?
- It’s not so simple...
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// Generated
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are
fatal.
open func execute(completionHandler:
@escaping (Error?) -> Void)
// Swift
execute { error in
print(error)
}
// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
How to call coroutines from Swift?
- It’s not so simple...
- How to cancel?
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// Generated
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are
fatal.
open func execute(completionHandler:
@escaping (Error?) -> Void)
// Swift
execute { error in
print(error)
}
// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
How to call coroutines from Swift?
- It’s not so simple...
- How to cancel?
- Changing Threads?
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- How to cancel?
- Changing Threads?
- Exception handling?
// Generated
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are
fatal.
open func execute(completionHandler:
@escaping (Error?) -> Void)
// Swift
execute { error in
print(error)
}
// Kotlin
suspend fun execute() {
print("44af1d53beeb")
}
How to call coroutines from Swift?
- It’s not so simple...
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Agenda
- Calling default Suspend and Flows directly from Swift
- Creating Coroutine Adapters
- Using KMP-NativeCoroutines
- SwiftUI integrations
- Exception Handling
- Cancellation
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The App
- KaMPKit Starter
from Touchlab
- Downloads from
API i and saves
to a Database
- 3 Coroutines call
implementations
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github.com/AKJAW/Swift-Coroutines-With-KMP-NativeCoroutines
- KaMPKit Starter
from Touchlab
- Downloads from
API i and saves
to a Database
- 3 Coroutines call
implementations
The App
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What are we
calling
- Ordinary function
- Suspend function
- Data stream
class BreedViewModel() : ViewModel() {
val breedState: StateFlow
suspend fun refreshBreeds(): Boolean
fun updateBreedFavorite(breed: Breed): Job
}
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actual abstract class ViewModel {
actual val viewModelScope = MainScope()
fun clear() {
viewModelScope.coroutineContext
.cancelChildren()
}
}
class BreedViewModel() : ViewModel() {
val breedState: StateFlow
suspend fun refreshBreeds(): Boolean
fun updateBreedFavorite(breed: Breed): Job
}
What are we
calling
- Ordinary function
- Suspend function
- Data stream
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The easiest one is the Ordinary
function
fun updateBreedFavorite(breed: Breed): Job {
return viewModelScope.launch {
breedRepository.updateBreedFavorite(breed)
}
}
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fun updateBreedFavorite(breed: Breed): Job {
return viewModelScope.launch {
breedRepository.updateBreedFavorite(breed)
}
}
func onBreedFavorite(_ breed: Breed) {
viewModel?.updateBreedFavorite(breed: breed)
}
The easiest one is the Ordinary
function
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Ordinary
functions
- Fire and forget
- Modify internal
state
- CoroutineScope is
available
fun updateBreedFavorite(breed: Breed): Job {
return viewModelScope.launch {
breedRepository.updateBreedFavorite(breed)
}
}
func onBreedFavorite(_ breed: Breed) {
viewModel?.updateBreedFavorite(breed: breed)
}
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Suspend functions
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Suspending functions in Swift
- Default generated framework
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- Default generated framework
- Manual Adaptera / Wrappera
Suspending functions in Swift
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- Default generated framework
- Manual Adaptera / Wrappera
- KMP-NativeCoroutines Plugin
Suspending functions in Swift
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Suspending functions
- We want to know when
it completes
- The return value is
needed
- We want the ability to
cancel it
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suspend fun refreshBreeds(): Boolean {
return try {
breedRepository.refreshBreeds()
true
} catch (exception: Exception) {
handleBreedError(exception)
false
}
}
Suspending functions
- We want to know when
it completes
- The return value is
needed
- We want the ability to
cancel it
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Generated
function
- Cannot be
cancelled
- Forces an
Optional value
func refresh() {
viewModel?.refreshBreeds { wasRefreshed, error in
print("\(wasRefreshed), \(error)")
}
}
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/**
* @note This method converts instances of
CancellationException to errors.
* Other uncaught Kotlin exceptions are fatal.
*/
- (void)refreshBreedsWithCompletionHandler:(void
(^)(SharedBoolean * _Nullable, NSError *
_Nullable))completionHandler
__attribute__((swift_name("refreshBreeds(completionHandler:)"))
);
func refresh() {
viewModel?.refreshBreeds { wasRefreshed, error in
print("\(wasRefreshed), \(error)")
}
}
Generated
function
- Cannot be
cancelled
- Forces an
Optional value
- No error handling
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Adapter / Wrapper - Kotlin
class SuspendAdapter(
private val scope: CoroutineScope,
private val suspender: suspend () -> T
) {
fun subscribe(
onSuccess: (item: T) -> Unit,
onThrow: (error: Throwable) -> Unit
) = scope.launch {
try {
onSuccess(suspender())
} catch (error: Throwable) {
onThrow(error)
}
}
}
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Adapter / Wrapper - Kotlin
fun refreshBreeds() =
SuspendAdapter(viewModel.scope) {
viewModel.refreshBreeds()
}
class SuspendAdapter(
private val scope: CoroutineScope,
private val suspender: suspend () -> T
) {
fun subscribe(
onSuccess: (item: T) -> Unit,
onThrow: (error: Throwable) -> Unit
) = scope.launch {
try {
onSuccess(suspender())
} catch (error: Throwable) {
onThrow(error)
}
}
}
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Adapter / Wrapper - Kotlin
class SuspendAdapter(
private val scope: CoroutineScope,
private val suspender: suspend () -> T
) {
fun subscribe(
onSuccess: (item: T) -> Unit,
onThrow: (error: Throwable) -> Unit
) = scope.launch {
try {
onSuccess(suspender())
} catch (error: Throwable) {
onThrow(error)
}
}
}
fun refreshBreeds() =
SuspendAdapter(viewModel.scope) {
viewModel.refreshBreeds()
}
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Adapter/Wrapper -
Swift
viewModel.refreshBreeds().subscribe(
onSuccess: { value in
print("completion \(value)")
},
onThrow: { error in
print("error \(error)")
}
)
- Better error
handling
- No Optional value
- Additional
boilerplate
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Adapter/Wrapper -
Swift
- Better error
handling
- No Optional value
- Additional
boilerplate
- Ability to
integrate with
Combine
viewModel.refreshBreeds().subscribe(
onSuccess: { value in
print("completion \(value)")
},
onThrow: { error in
print("error \(error)")
}
)
createFuture(suspendAdapter: adapter)
.sink { completion in
print("completion \(completion)")
} receiveValue: { value in
print("recieveValue \(value)")
}.store(in: &cancellables)
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KMP-NativeCoroutines
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Suspend KMP-NativeCoroutines
@NativeCoroutines
suspend fun nativeRefreshBreeds(): Boolean =
refreshBreeds()
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NativeCoroutines
@NativeCoroutines
suspend fun nativeRefreshBreeds(): Boolean =
refreshBreeds()
- No boilerplate
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NativeCoroutines
let suspend = viewModel.nativeRefreshBreeds()
createFuture(for: suspend)
.sink { completion in
print("completion \(completion)")
} receiveValue: { value in
print("recieveValue \(value)")
}
@NativeCoroutines
suspend fun nativeRefreshBreeds(): Boolean =
refreshBreeds()
- No boilerplate
- Error handling
- No Optional
- Dedicated Swift
packages Combine,
Async, RxSwift
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NativeCoroutines
- No boilerplate
- Error handling
- No Optional
- Dedicated Swift
packages Combine,
Async, RxSwift
- Automatic
cancelling
let suspend = viewModel.nativeRefreshBreeds()
createFuture(for: suspend)
.sink { completion in
print("completion \(completion)")
} receiveValue: { value in
print("recieveValue \(value)")
}.store(in: &cancellables)
@NativeCoroutines
suspend fun nativeRefreshBreeds(): Boolean =
refreshBreeds()
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Flow Data Streams
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Data streams
- Generated framework - Many limitations + Boilerplate
- Adapter / Wrapper - Additional boilerplate
- KMP Native Coroutines
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Flow Generated framework
class Collector:
Kotlinx_coroutines_coreFlowCollector {
private let callback: (T) -> Void
init(callback: @escaping (T) -> Void) {
self.callback = callback
}
func emit(value: Any?, completionHandler:
@escaping (Error?) -> Void) {
callback(value as! T)
completionHandler(nil)
}
}
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Flow Generated framework
class Collector:
Kotlinx_coroutines_coreFlowCollector {
private let callback: (T) -> Void
init(callback: @escaping (T) -> Void) {
self.callback = callback
}
func emit(value: Any?, completionHandler:
@escaping (Error?) -> Void) {
callback(value as! T)
completionHandler(nil)
}
}
viewModel.breedState.collect(
collector: Collector {
[weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
},
completionHandler: { error in
print("breed collection completion
error: \(error)")
}
)
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Flow Adapter / Wrapper
class FlowAdapter(
private val scope: CoroutineScope,
private val flow: Flow
) {
fun subscribe(
onEach: (item: T) -> Unit,
onComplete: () -> Unit,
onThrow: (error: Throwable) -> Unit
): Canceller = JobCanceller(
flow.onEach { onEach(it) }
.catch { onThrow(it) }
.onCompletion { onComplete() }
.launchIn(scope)
)
}
interface Canceller {
fun cancel()
}
private class JobCanceller(private val job:
Job) : Canceller {
override fun cancel() {
job.cancel()
}
}
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Flow Adapter / Wrapper
class FlowAdapter(
private val scope: CoroutineScope,
private val flow: Flow
) {
fun subscribe(
onEach: (item: T) -> Unit,
onComplete: () -> Unit,
onThrow: (error: Throwable) -> Unit
): Canceller = JobCanceller(
flow.onEach { onEach(it) }
.catch { onThrow(it) }
.onCompletion { onComplete() }
.launchIn(scope)
)
}
interface Canceller {
fun cancel()
}
private class JobCanceller(private val job:
Job) : Canceller {
override fun cancel() {
job.cancel()
}
}
viewModel.breeds.subscribe(
onEach: { [weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
},
onComplete: { print("Subscription end") },
onThrow: { error in print("Subscription
error: \(error)") }
)
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Flow KMP-NativeCoroutines
private val mutableBreedState =
MutableStateFlow(
BreedViewState(isLoading = true)
)
@NativeCoroutinesState
val nativeBreedState: StateFlow =
breedState
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Flow KMP-NativeCoroutines
private val mutableBreedState =
MutableStateFlow(
BreedViewState(isLoading = true)
)
@NativeCoroutinesState
val nativeBreedState: StateFlow =
breedState
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Native Flow
- Integration with
Native solutions
let nativeFlow = viewModel.nativeBreedStateFlow
createPublisher(for: nativeFlow)
.receive(on: DispatchQueue.main)
.sink { completion in
print("Breeds completion \(completion)")
} receiveValue: { [weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
}
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Native Flow
let nativeFlow = viewModel.nativeBreedStateFlow
createPublisher(for: nativeFlow)
.receive(on: DispatchQueue.main)
.sink { completion in
print("Breeds completion \(completion)")
} receiveValue: { [weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
}
- Integration with
Native solutions
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Native Flow
let nativeFlow = viewModel.nativeBreedStateFlow
createPublisher(for: nativeFlow)
.receive(on: DispatchQueue.main)
.sink { completion in
print("Breeds completion \(completion)")
} receiveValue: { [weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
}
- Integration with
Native solutions
- Collection on
Default
dispatcher
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Native Flow
- Integration with
Native solutions
- Collection on
Default
dispatcher
- Automatic
cancellation
let nativeFlow = viewModel.nativeBreedStateFlow
createPublisher(for: nativeFlow)
.receive(on: DispatchQueue.main)
.sink { completion in
print("Breeds completion \(completion)")
} receiveValue: { [weak self] dogsState in
self?.loading = dogsState.isLoading
self?.breeds = dogsState.breeds
self?.error = dogsState.error
}
.store(in: &cancellables)
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Controlling the Scope
- Ability to cancel directly
from Kotlin
- Specify which thread
should the suspension
happen
@NativeCoroutineScope
actual val viewModelScope =
MainScope()
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SwiftUI
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SwiftUI Integration
- Combine
- ObservableObject
- @Published
- @StateObject / @ObservedObject
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Playground
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Playground
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Playground
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Published Int
@NativeCoroutines
val numberFlow: Flow = flow {
var i = 0
while (true) {
emit(i++)
delay(1000)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
private class CoroutinesExampleModel: ObservableObject {
@Published
var number: Int = -1
func activate() {
createPublisher(for: viewModel.numberFlow)
.sink { _ in
} receiveValue: { [weak self] number in
self?.number = number.intValue
}
.store(in: &cancellables)
}
}
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Published Int
struct CoroutinesExampleScreen: View {
@StateObject
private var observableModel = CoroutinesExampleModel()
var body: some View {
Text("Number: \(observableModel.number)")
}
}
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Published Int
struct CoroutinesExampleScreen: View {
@StateObject
private var observableModel = CoroutinesExampleModel()
var body: some View {
Text("Number: \(observableModel.number)")
}
}
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Published Int
struct CoroutinesExampleScreen: View {
@StateObject
private var observableModel = CoroutinesExampleModel()
var body: some View {
Text("Number: \(observableModel.number)")
}
}
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Published Int
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KmmViewModel - Bonus
- The same author
- Generates ObservableObject itd.
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KmmViewModel - Bonus
ObservableObject KMMViewModel
@StateObject @StateViewModel
@ObservedObject @ObservedViewModel
@EnvironmentObject @EnvironmentViewModel
environmentObject(_:) environmentViewModel(_:)
- The same author
- Generates ObservableObject itd.
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Suspend Exception Handling
@NativeCoroutines
suspend fun throwException() {
delay(1000)
throw IllegalStateException()
}
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Suspend Exception Handling
print("future exception start")
createFuture(for: viewModel.throwException())
.sink { completion in
print("future exception completion \(completion)")
} receiveValue: { value in
}
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Suspend Exception Handling
18:07:03 future exception start
18:07:04 future exception completion failure(Error Domain=KotlinExcepton
Code=0 "(null)" UserInfo={KotlinException=kotlin.IllegalStateException})
print("future exception start")
createFuture(for: viewModel.throwException())
.sink { completion in
print("future exception completion \(completion)")
} receiveValue: { value in
}
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Flow Exception Handling
@NativeCoroutines
val errorFlow: Flow = flow {
repeat(3) { number ->
emit(number)
delay(1000)
}
throw IllegalStateException()
}
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Flow Exception Handling
createPublisher(for: viewModel.errorFlow)
.sink { completion in
print("publisher exception completion \(completion)")
} receiveValue: { number in
print("publisher exception recieveValue \(number)")
}
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Flow Exception Handling
createPublisher(for: viewModel.errorFlow)
.sink { completion in
print("publisher exception completion \(completion)")
} receiveValue: { number in
print("publisher exception recieveValue \(number)")
}
2023-03-21 18:14:24 publisher exception recieveValue 0
2023-03-21 18:14:25 publisher exception recieveValue 1
2023-03-21 18:14:26 publisher exception recieveValue 2
2023-03-21 18:14:27 publisher exception completion
failure(Error Domain=KotlinException Code=0 "(null)"
UserInfo={KotlinException=kotlin.IllegalStateException})
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Exception
Handling
- Exception is a
Completion in
Combine
- Exception
handling is hard
in Swift
- Better to return
an error value
@NativeCoroutines
suspend fun throwException() {
delay(1000)
throw IllegalStateException()
}
@NativeCoroutines
val errorFlow: Flow = flow {
repeat(3) { number ->
emit(number)
delay(1000)
}
throw IllegalStateException()
}
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Cancellation
@NativeCoroutines
val numberFlow: Flow = flow {
var i = 0
while (true) {
emit(i++)
delay(1000)
}
}.onEach { number ->
log.i("numberFlow onEach: $number")
}.onCompletion {throwable ->
log.i("numberFlow onCompletion: $throwable")
}
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Manual cancellation
createPublisher(
for: viewModel.numberFlow
)
.sink(...)
.store(in: &cancellables)
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Manual cancellation
createPublisher(
for: viewModel.numberFlow
)
.sink(...)
.store(in: &cancellables)
func cancel() {
cancellables.forEach { $0.cancel() }
cancellables.removeAll()
}
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Manual cancellation
createPublisher(
for: viewModel.numberFlow
)
.sink(...)
.store(in: &cancellables)
func cancel() {
cancellables.forEach { $0.cancel() }
cancellables.removeAll()
}
2023-03-24 12:21:30 numberFlow onEach: 0
2023-03-24 12:21:31 numberFlow onEach: 1
2023-03-24 12:21:32 numberFlow onEach: 2
2023-03-24 12:21:33 numberFlow onCompletion:
kotlinx.coroutines.JobCancellationException: …
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Automatic cancellation
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Automatic cancellation
createPublisher(
for: viewModel.numberFlow
)
.sink(...)
.store(in: &cancellables)
2023-03-24 12:28:13 init 0x44af1d53beeb
2023-03-24 12:28:13 numberFlow onEach: 0
2023-03-24 12:28:14 numberFlow onEach: 1
2023-03-24 12:28:15 numberFlow onEach: 2
2023-03-24 12:28:16 numberFlow onEach: 3
2023-03-24 12:28:16 deinit 0x44af1d53beeb
2023-03-24 12:28:16 numberFlow onCompletion:
kotlinx.coroutines.JobCancellationException: ...
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Cancellation
- Freeing up
resources
- Avoiding
unnecessary
networking
- Avoiding Memory
leaks
var cancellables = [AnyCancellable]()
...
.store(in: &cancellables)
func cancel() {
cancellables.forEach { $0.cancel() }
cancellables.removeAll()
}
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Summary
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Summary
- Different ways of Suspend and Flow from swift
- Integrating KMP-NativeCoroutines with SwiftUi
- Exception Handling
- Cancellation
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Learning Kotlin Multiplatform
- https://johnoreilly.dev/
- https://touchlab.co/blog/
- https://www.marcogomiero.com/
- https://akjaw.com/
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Sources
- https://github.com/AKJAW/Swift-Coroutines-With-KMP-NativeCoroutines
- https://github.com/touchlab/KaMPKit
- https://github.com/rickclephas/KMP-NativeCoroutines
- https://github.com/rickclephas/KMM-ViewModel
- https://dev.to/touchlab/kotlin-coroutines-and-swift-revisited-j5h
- https://www.slideshare.net/ChristianMelchior/coroutines-for-kotlin-multiplatform-in
-practise
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Questions?