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Flutter ×
Kotlin Multiplatform
by 2021/02/24 #2
#ca_flutter_kmm
by Taiki Suzuki
iOSΞϓϦʹKMMΛಋೖ͢Δtips
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ࣗݾհ
#ca_flutter_kmm
marty_suzuki
marty-suzuki
Taiki Suzuki
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ΞδΣϯμ
#ca_flutter_kmm
• Suspend functionΛiOSͰΩϟϯηϧͰ͖ΔΑ͏ʹ͢Δ
• ςετͷͱ͖͚ͩҙͷϞδϡʔϧΛimport͍ͨ͠
• KMMͷFrameworkΛϓϥΠϕʔτϦϙδτϦͷReleasesʹ
Ξοϓϩʔυͯ͠CocoaPodsͰDLͰ͖ΔΑ͏ʹ͢Δ
• KotlinͰ࣮͞ΕͨNSObjectͷαϒΫϥεΛSwizzle͢Δͱ
Ϋϥογϡ͢Δ
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Suspend functionΛ
iOSͰΩϟϯηϧͰ͖ΔΑ͏ʹ͢Δ
#ca_flutter_kmm
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KotlinͰͷInterface
#ca_flutter_kmm
public interface VideoRankingApi {
public suspend fun getGenreRanking(
type: GenreRankingType,
limit: Int?
): GenreRankingResponse
}
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SwiftͰݺͼग़ͤΔϝιου
#ca_flutter_kmm
videoRankingApi.getGenreRanking(
type: .free,
limit: nil
completionHandler: { (response: GenreRankingResponse?, error: Error?) in
}
)
※ϝιουͷฦΓ͕VoidͳͷͰAPI௨৴ͳͲΛΩϟϯηϧ͢Δज़͕Swift͔ΒΞΫηεͰ͖Δੈքʹͳ͍
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SwiftͰҎԼͷΑ͏ʹݺͼग़ͤΔΑ͏ʹ͢Δ
#ca_flutter_kmm
let job = videoRankingApi.getGenreRanking(type: .free, limit: nil)
.subscribe(
onSuccess: { (response: GenreRankingResponse?) in
},
onThrow: { (throwable: KotlinThrowable) in
}
)
job.cancel(cause_: nil)
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Working with Kotlin Coroutines and RxSwift
#ca_flutter_kmm
https://touchlab.co/kotlin-coroutines-rxswift/
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Suspend functionΛϥοϓ͢Δ
#ca_flutter_kmm
class SuspendWrapper(private val suspender: suspend () -> T) {
suspend fun suspend(): T = suspender()
fun subscribe(
onSuccess: (item: T) -> Unit,
onThrow: (error: Throwable) -> Unit
) : Job = CoroutineScope(SupervisorJob() + Dispatchers.Main).launch {
try {
onSuccess(suspender())
} catch (error: Throwable) {
onThrow(error)
}
}
}
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Suspend functionΛϥοϓ͢Δ
#ca_flutter_kmm
public interface VideoRankingApi {
public suspend fun getGenreRanking(
type: GenreRankingType,
limit: Int?
): SuspendWrapper
}
˞%FGFSSFE5Ͱฦ͢ํ๏͋Δ͕ɺ%FGFSSFEJOUFSGBDFͰ͋ΔͨΊ0CKFDUJWF$ʹม͢ΔͱQSPUPDPMʹͳΔ
ɹ0CKFDUJWF$ͷQSPUPDPM(FOFSJD"SHVNFOUΛ࣋ͨͳ͍ͨΊɺ5ͱఆ͍ٛͯͯ͠"OZʹͳͬͯ͠·͏
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SwiftͰҎԼͷΑ͏ʹݺͼग़ͤΔ
#ca_flutter_kmm
let job = videoRankingApi.getGenreRanking(type: .free, limit: nil)
.subscribe(
onSuccess: { (response: GenreRankingResponse?) in
},
onThrow: { (throwable: KotlinThrowable) in
}
)
job.cancel(cause_: nil)
˞σϝϦοτͱͯ͠J04Ͱ্هͷݺͼग़͠ΛͰ͖ΔΑ͏ʹ͢ΔͨΊʹɺ"OESPJEଆͰຊདྷෆཁͳTVTQFOE
Λ
ɹܦ༝ͯ͠TVTQFOEGVODUJPOΛݺͼग़͢Α͏ʹͳͬͯ͠·͏
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Suspend functionΛ
iOSͰΩϟϯηϧͰ͖ΔΑ͏ʹ͢Δ
#ca_flutter_kmm
SuspendWrapperΛͬͱ׆༻͍ͯ͘͠
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Koru
#ca_flutter_kmm
https://github.com/FutureMind/koru
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KoruͰࣗಈੜ͞ΕΔΫϥε
#ca_flutter_kmm
public class VideoRankingApiNative(
private val wrapped: VideoRankingApi
) {
public fun getGenreRanking(
type: GenreRankingType,
limit: Int?
): SuspendWrapper =
SuspendWrapper(exportedScopeProvider_mainScopeProvider) {
wrapped.getGenreRanking(type, limit)
}
}
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KoruΛར༻͢Δ
#ca_flutter_kmm
@ToNativeClass(launchOnScope = MainScopeProvider::class)
public interface VideoRankingApi {
public suspend fun getGenreRanking(
type: GenreRankingType,
limit: Int?
): GenreRankingResponse
}
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KoruΛར༻͢Δ
#ca_flutter_kmm
@ExportedScopeProvider
public class MainScopeProvider : ScopeProvider {
override val scope: CoroutineScope = MainScope()
}
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Suspend functionͷؔΛͦͷ··ݺΜͩ߹
#ca_flutter_kmm
videoRankingApi.getGenreRanking(
type: .free,
limit: nil
completionHandler: { (response: GenreRankingResponse?, error: Error?) in
}
)
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KoruͰࣗಈੜ͞ΕͨΫϥεͰϥοϓͯ͠ݺͼग़͢
#ca_flutter_kmm
let videoRankingApi: VideoRankingApi
let api = VideoRankingApiNative(wrapped: videoRankingApi)
let job = api.getGenreRanking(type: .free, limit: nil)
.subscribe(
onSuccess: { (response: GenreRankingResponse?) in
},
onThrow: { (throwable: KotlinThrowable) in
}
)
job.cancel(cause_: nil)
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SuspendWrapperΛRxSwiftͰදݱ͢ΔͱSingleͱͯ͠ѻ͑Δ
#ca_flutter_kmm
enum SuspendWrapperError: Error {
case invalidResponse
case throwable(KotlinThrowable)
}
extension Single where Element: AnyObject {
static func create(_ suspendWrapper: SuspendWrapper) -> Single {
Single.create { observer in
let job = suspendWrapper.subscribe(
onSuccess: { value in
guard let value = value else {
observer(.failure(SuspendWrapperError.invalidResponse))
return
}
observer(.success(value))
},
onThrow: { throwable in
observer(.failure(SuspendWrapperError.throwable(throwable)))
}
)
return Disposables.create {
job.cancel(cause_: nil)
}
}
}
}
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ҙͷΫϥεͰར༻͢Δ߹
#ca_flutter_kmm
final class VideoRankingRepository {
private let videoRankingApi: VideoRankingApiNative
init(videoRankingApi: VideoRankingApi) {
self.videoRankingApi = VideoRankingApiNative(wrapped: videoRankingApi)
}
func getGenreRanking() -> Single<[GenreRanking]> {
Single.create(videoRankingApi.getGenreRanking(type: .free, limit: nil))
.map { $0.genres.map(GenreRanking.init) }
}
}
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Suspend functionΛ
iOSͰΩϟϯηϧͰ͖ΔΑ͏ʹ͢Δ
#ca_flutter_kmm
SuspendWrapperΛར༻ͨ͠ΫϥεΛςετ͢Δ
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iOSͰͷςετ༻ʹImmediateScopeΛՃ
#ca_flutter_kmm
@Suppress("FunctionName")
public fun MainScope(): CoroutineScope = ContextScope(SupervisorJob() + Dispatchers.Main)
https://github.com/Kotlin/kotlinx.coroutines/blob/1.4.2/kotlinx-coroutines-core/common/src/CoroutineScope.kt#L84-L104
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MainScopeΛར༻͍ͯ͠ΔͷͰඇಉظͳςετΛॻ͘ඞཁ͕͋Δ
#ca_flutter_kmm
class SampleProjectTests: XCTestCase {
func testGenreRanking() throws {
let fakeApi = FakeVideoRankingApi()
let suspender = MockSuspendFunction()
fakeApi.genreRankingResponse = suspender.asSuspendWrapper()
let repository = VideoRankingRepository(videoRankingApi: fakeApi)
let expect = expectation(description: "Wait")
var response: [GenreRanking]?
let disposable = repository.getVideoGenreRanking()
.subscribe(onSuccess: { (value: [GenreRanking]) in
response = value
expect.fulfill()
})
defer { disposable.dispose() }
DispatchQueue.main.async {
suspender.respond(.success(RankingVideoSeriesResponse.Companion().fake()))
}
wait(for: [expect], timeout: 0.1)
XCTAssertNotNil(response)
}
}
ᶃ
ᶄ
ᶅ
ᶆ
ᶇ
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Dispatchers.Main.immediate͕Main Thread͔ΒͰdispatch͞ΕΔ
#ca_flutter_kmm
https://github.com/Kotlin/kotlinx.coroutines/issues/2283
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iOSͰͷςετ༻ʹImmediateScopeΛՃ
#ca_flutter_kmm
@Suppress("FunctionName")
public fun ImmediateScope() = CoroutineScope(
SupervisorJob() + object : CoroutineDispatcher() {
override fun dispatch(context: CoroutineContext, block: Runnable) {
block.run()
}
}
)
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iOSͰͷςετ༻ʹImmediateScopeΛՃ
#ca_flutter_kmm
@ExportedScopeProvider
public class MainScopeProvider : ScopeProvider {
override val scope: CoroutineScope
get() = scopeHolder.access { it.scope }
private class ScopeHolder(var scope: CoroutineScope)
private val scopeHolder = IsolateState {
ScopeHolder(MainScope())
}
fun setScope(scope: CoroutineScope) {
scopeHolder.access { it.scope = scope }
}
}
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iOSͰͷςετ༻ʹImmediateScopeΛՃ
#ca_flutter_kmm
MainScopeProviderContainerKt
.exportedScopeProvider_mainScopeProvider
.setScope(scope: ImmediateScopeKt.ImmediateScope())
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ςετͷSuspendFunction͚ͷScopeProviderΛՃ
#ca_flutter_kmm
final class ImmediateScopeProvider: ScopeProvider {
let scope: CoroutineScope = ImmediateScopeKt.ImmediateScope()
}
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ςετ༻ͷKotlinSuspendFunctionͷϞοΫΛՃ
#ca_flutter_kmm
final class MockSuspendFunction: KotlinSuspendFunction0 {
private var handler: ((Result) -> Void)?
func invoke(completionHandler: @escaping (Any?, Error?) -> Void) {
handler = { result in
do {
completionHandler(try result.get(), nil)
} catch {
completionHandler(nil, error)
}
}
}
func respond(_ result: Result) {
handler?(result)
}
func asSuspendWrapper() -> SuspendWrapper {
SuspendWrapper(scopeProvider: ImmediateScopeProvider(), suspender: self)
}
}
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ImmediateScopeΛར༻ͯ͠ಉظతʹϢχοτςετΛ࣮ߦ͢Δ
#ca_flutter_kmm
class SampleProjectTests: XCTestCase {
func testGenreRanking() throws {
MainScopeProviderContainerKt.exportedScopeProvider_mainScopeProvider
.setOverrideScope(scope: ImmediateScopeKt.ImmediateScope())
let fakeApi = FakeVideoRankingApi()
let suspender = MockSuspendFunction()
fakeApi.genreRankingResponse = suspender.asSuspendWrapper()
let repository = VideoRankingRepository(videoRankingApi: fakeApi)
let response = BehaviorRelay<[GenreRanking]?>(value: nil)
let disposable = repository.getGenreRanking().asObservable().bind(to: response)
defer { disposable.dispose() }
suspender.respond(.success(GenreRankingResponse.Companion().fake()))
XCTAssertNotNil(response.value)
}
}
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ςετͷͱ͖͚ͩ
ҙͷϞδϡʔϧΛimport͍ͨ͠
#ca_flutter_kmm
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KMMͷߏ
#ca_flutter_kmm
module A
iOSKMM.framwork
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KMMͷߏ
#ca_flutter_kmm
ios-kmm
module A module B
iOSKMM.framwork
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KMMͷߏ
#ca_flutter_kmm
ios-kmm
module A module B
ios-kmm-mock
iOSKMM.framwork iOSKMMMock.framwork
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KMMͷߏ
#ca_flutter_kmm
ios-kmm
module A module B
ios-kmm-mock
iOSKMM.framwork iOSKMMMock.framwork
❌
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KMMͷߏ
#ca_flutter_kmm
ios-kmm
module A module B
ios-kmm-mock
iOSKMMMock.framwork
ios-kmm
module A module B
iOSKMM.framwork
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==
KMMͷߏ
#ca_flutter_kmm
iOSKMM.framwork iOSKMMMock.framwork
❌
module A
class ApiClient
module A
class ApiClient
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ଥڠҊ: ReleaseͱDebugͰϦϯΫ͢ΔFrameworkΛذ͢Δ
#ca_flutter_kmm
target ‘SampleProject’ do
pod 'iOSKMM', '0.1.0', :configuration => 'Release'
pod 'iOSKMMMock', ‘0.1.0', :configuration => 'Debug'
end
※ςετλʔήοτͷϏϧυ࣌ʹϦϯΫ͢ΔFrameworkΛมߋ͢ΔεΫϦϓτΛ࣮ߦ͢Δͱ͍͏ख͋Γ·͢
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KMMͷFrameworkΛϓϥΠϕʔτϦϙδτϦͷReleasesʹ
Ξοϓϩʔυͯ͠CocoaPodsͰDLͰ͖ΔΑ͏ʹ͢Δ
#ca_flutter_kmm
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Use a Kotlin Gradle project as a CocoaPods dependency
#ca_flutter_kmm
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Use a Kotlin Gradle project as a CocoaPods dependency
#ca_flutter_kmm
https://kotlinlang.org/docs/native-cocoapods.html#add-a-dependency-between-a-
kotlin-pod-and-xcode-project-with-one-target
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όΠφϦΛCocoaPodsܦ༝Ͱཧ͢Δ
#ca_flutter_kmm
Private
Repository
Releases
iOSKMM.zip
target ‘SampleProject’ do
pod 'iOSKMM', '0.1.0'
end
iOSKMM.framwork
iOSKMM.zip
iOSKMM.zip
Private Specs
iOSKMM.podspec
iOSKMM.podspec.json
iOSKMM.framwork
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௨ৗͷpodspecͷఆٛ
#ca_flutter_kmm
Pod::Spec.new do |spec|
spec.name = 'iOSKMM'
spec.version = '0.1.0'
spec.homepage = 'https://github.com/marty-suzuki/kmm'
spec.authors = 'marty-suzuki'
spec.license = 'LICENSE'
spec.summary = 'SUMMARY'
spec.source = {
:http => 'https://github.com/marty-suzuki/kmm/releases/download/0.1.0/iOSKMM.zip'
}
spec.vendored_frameworks = 'iOSKMM.framework'
end
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Private RepositoryͷReleases
#ca_flutter_kmm
˞1SJWBUF3FQPTJUPSZͳͷͰʮIUUQTHJUIVCDPNNBSUZTV[VLJLNNSFMFBTFTEPXOMPBEJ04,..[JQʯʹ
ɹೝূঢ়ଶͰΞΫηεͨ͠ͱͯ͠ɺΞΫηεՄೳͳ63-BTTFUͷVSMͱͳΔͨΊΤϥʔʹͳͬͯ͠·͏
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assetsͷURLͷऔಘॲཧΛؚΜͩpodspec
#ca_flutter_kmm
Pod::Spec.new do |spec|
module PrivateRepository
class Spec
attr_reader :version
attr_reader :homepage
attr_reader :source
def initialize(owner, name, version, source)
@version = version
@homepage = "https://github.com/#{owner}/#{name}"
@source = source
end
end
class SpecLoader
def initialize(owner, name, version, token)
@owner = owner
@name = name
@version = version
if !token.nil? && !token.empty?
@authorizationToken = "Authorization: token #{token}"
else
@authorizationToken = nil
end
end
def loadPrivateSpec
tagResponse = loadTag
assetURL = getAssetURL(tagResponse)
headers = ["Accept: application/octet-stream"]
if [email protected]?
headers.push(@authorizationToken)
end
source = {
:http => assetURL,
:headers => headers,
:type => "zip"
}
return PrivateRepository::Spec.new(@owner, @name, @version, source)
end
private
def loadTag
requestURL = "https://api.github.com/repos/#{@owner}/#{@name}/releases/tags/#{@version}"
cmdElements = ["curl"]
if [email protected]?
cmdElements.push("-sL")
cmdElements.push("-H \"#{@authorizationToken}\"")
else
cmdElements.push("-nsL")
end
cmdElements.push(requestURL)
cmd = cmdElements.join(" ")
response = %x[#{cmd}]
if response.nil?
puts "Failed Request: #{requestURL}"
exit!
else
return response
end
end
def getAssetURL(tagResponse)
tag_hash = JSON.load(tagResponse)
asset = tag_hash["assets"]&.first
assetURL = asset && asset["url"]
if assetURL.nil?
puts "Can't get asset URL."
exit!
else
return assetURL
end
end
end
end
privateSpecLoader = PrivateRepository::SpecLoader.new("marty-suzuki", "kmm", "0.1.0", ENV["GITHUB_ACCESS_TOKEN"])
privateSpec = privateSpecLoader.loadPrivateSpec
spec.name = 'iOSKMM'
spec.version = privateSpec.version
spec.homepage = privateSpec.homepage
spec.authors = 'marty-suzuki'
spec.license = 'LICENSE'
spec.summary = 'SUMMARY'
spec.source = privateSpec.source
spec.vendored_frameworks = 'iOSKMM.framework'
end
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pod repo push࣌ʹpodspecͰassetsͷURLΛऔಘ͢Δ
#ca_flutter_kmm
iOSKMM.podspec
GitHub API
GET /repos/{OWNER}/{REPO}/releases/tag/{NAME}
ҙͷtagͷreleasesͷใ
Ϩεϙϯεͷassets͔ΒҙͷzipϑΝΠϧ໊ͷassetΛऔಘ͢Δ
asset[“url”]Λऔಘ͠ɺspecͷsourceʹೖ͢Δ
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࠷ऴతͳpodspecͷ༰
#ca_flutter_kmm
Pod::Spec.new do |spec|
spec.name = 'iOSKMM'
spec.version = '0.1.0'
spec.homepage = 'https://github.com/marty-suzuki/kmm'
spec.authors = 'marty-suzuki'
spec.license = 'LICENSE'
spec.summary = 'SUMMARY'
spec.source = {
:http => 'https://api.github.com/repos/marty-suzuki/kmm/releases/assets/12345678',
:headers => ["Accept: application/octet-stream"],
:type => "zip"
}
spec.vendored_frameworks = 'iOSKMM.framework'
end
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Private RepositoryͷReleases༻ͷpodspec template
#ca_flutter_kmm
IUUQTHJTUHJUIVCDPNNBSUZTV[VLJ
EGFDDCFFDGEEDBCEB
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Private RepositoryͷReleasesΛར༻͢Δ߹ͷҙ
#ca_flutter_kmm
• v1.9.xͷCocoaPodsͰɺ࣮ࡍʹpod installՄೳͳpodspecͰ͋ͬͯpod lib lint࣌ʹ
vendored_frameworksͷvalidationͰΤϥʔʹͳͬͯ͠·͏ͷͰɺlintΛ࣮ߦ͠ͳ͍
ͱ͍͏ରԠํ๏͕ݱঢ়ͷճආࡦʢ࠷৽൛Ͱͬͯͳͦ͞͏ʣ
• GITHUB_ACESS_TOKENΛར༻ͭͭ͠pod repo push࣌ʹ—use-jsonΛࢦఆ͢Δͱ
Private SpecsͷjsonͷheadersʹGITHUB_ACESS_TOKEN͕هࡌ͞Εͯ͠·͏ͷͰ
.netrcΛར༻͢Δ͜ͱΛਪ
• xcframeworkΛར༻͍ͯ͠Δͱ࣮ࡍʹϦϯΫՄೳͰpod repo push࣌ʹlinkerͷΤϥʔ
ʹͳΔ߹͕͋ΔͷͰɺ—skip-import-validationͱ—skip-testsΛࢦఆ͢Δ͜ͱͰճආ
• pod install࣌ʹ.netrc·ͨGITHUB_ACCESS_TOKEN͕ඞཁʢpod repo pushΛ
࣮ߦͨ͠ͱ͖ʹར༻ͨ͠ํʹ߹ΘͤΔʣ
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KotlinͰ࣮͞ΕͨNSObjectͷαϒΫϥεΛ
Swizzle͢ΔͱΫϥογϡ͢Δ
#ca_flutter_kmm
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Fixed since kotlin-native v1.4.30
#ca_flutter_kmm
https://github.com/JetBrains/kotlin-native/pull/4569
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e.g. ktor IosResponseReader
#ca_flutter_kmm
https://github.com/ktorio/ktor/blob/1.5.1/ktor-client/ktor-client-ios/darwin/
src/io/ktor/client/engine/ios/IosResponseReader.kt
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e.g. ktor IosResponseReader
#ca_flutter_kmm
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e.g. ktor IosResponseReader
#ca_flutter_kmm
https://github.com/ktorio/ktor/blob/master/ktor-client/ktor-client-ios/
darwin/src/io/ktor/client/engine/ios/IosClientEngine.kt
~
~
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e.g. ktor IosResponseReader
#ca_flutter_kmm
internalͳͷͰKMMଆͰରԠ͢Δ͜ͱ͕Ͱ͖ͳ͍
forkͯ͠मਖ਼ରԠ͢Δ͔͠ͳ͍?
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SwiftଆͰURLSessionͷinitializerΛswizzleͯ͠delegateΛೖΕସ͑Δ
#ca_flutter_kmm
extension URLSession {
@objc dynamic fileprivate class func kotlinWorkaroundInitializer(
configuration: URLSessionConfiguration,
delegate: URLSessionDelegate?,
delegateQueue queue: OperationQueue?
) -> URLSession {
kotlinWorkaroundInitializer(
configuration: configuration,
delegate: delegate.map {
// xxxio.ktor.client.engine.ios.IosResponseReader0
guard NSStringFromClass(type(of: $0)).contains("ktor") else {
return $0
}
return WorkaroundDelegateProxy(delegate: $0)
},
delegateQueue: queue
)
}
}
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SwiftଆͰURLSessionͷinitializerΛswizzleͯ͠delegateΛೖΕସ͑Δ
#ca_flutter_kmm
fileprivate final class KotlinWorkaroundDelegateProxy: NSObject, URLSessionDataDelegate {
private let delegate: URLSessionDataDelegate?
init(delegate: URLSessionDelegate) {
self.delegate = delegate as? URLSessionDataDelegate
}
…
func urlSession(
_ session: URLSession,
dataTask: URLSessionDataTask,
didReceive data: Data
) {
delegate?.urlSession?(session, dataTask: dataTask, didReceive: data)
}
}
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SwiftଆͰURLSessionͷinitializerΛswizzleͯ͠delegateΛೖΕସ͑Δ
#ca_flutter_kmm
extension ApiClient {
private static var _once: () = {
typealias FunctionType = (URLSessionConfiguration, URLSessionDelegate?, OperationQueue?) -> URLSession
let from = #selector(URLSession.init(configuration:delegate:delegateQueue:) as FunctionType)
let to = #selector(URLSession.kotlinWorkaroundInitializer(configuration:delegate:delegateQueue:))
guard
let fromMethod = class_getClassMethod(URLSession.self, from),
let toMethod = class_getClassMethod(URLSession.self, to)
else {
return
}
method_exchangeImplementations(fromMethod, toMethod)
}()
static func swizzleURLSessionInitializer() {
_ = _once
}
}
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One more thing…
#ca_flutter_kmm
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Flutter ×
Kotlin Multiplatform
by 2021/xx/xx #3
#ca_flutter_kmm
KMMશମʹؔ͢ΔτʔΫ
UBLBIJSPN
!OFX@SVOOBCMF
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#ca_flutter_kmm
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
by Taiki Suzuki
iOSΞϓϦʹKMMΛಋೖ͢Δtips