Swift6がもたらす開発者体験を予測しよう！ #QiitaNight https://increments.connpass.com/event/246181/
アバターアプリ: https://tattn.fanbox.cc/posts/3541601
WWDC Extended Tokyo 2022: https://yj-meetup.connpass.com/event/247614/
Swift ConcurrencyʹΑΔ ҆શͰշదͳඇಉظॲཧTatsuya Tanaka / ాத ୡQiita Night-Swift6͕ͨΒ͢։ൃऀମݧΛ༧ଌ͠Α͏ʂ (#QiitaNight)
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ͨͳͨͭ / Tatsuya Tanaka• Ϡϑʔגࣜձࣾ / iOSΞϓϦࠇଳ• TechFeed Expert@tattn@tanakasan2525@tattn
VTuberελΠϧͰWebձٞʹࢀՃͰ͖ΔΞϓϦެ։த
WWDC Extended Tokyo 2022։࠵IUUQTZKNFFUVQDPOOQBTTDPNFWFOU
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Swift 6Ͱඇಉظॲཧ ͞Βʹ γϯϓϧ Ͱ ؆୯ ʹͳΔ
ඇಉظॲཧͷ͍͠ͱ͜Ζ
Մಡੑͷҡ࣋ഉଞ੍ޚ
Completion HandlerͷՄಡੑfunc configureApp() {let group = DispatchGroup()(0...2).forEach { _ in group.enter() }// アプリの更新チェックvar updateInfo: UpdateInfo!forcedUpdate.checkUpdates {updateInfo = $0group.leave()}// データマイグレーションdataMigrator.migration {// データマイグレーションの結果を保存saveMigrationResult($0)group.leave()}var weather: Weather!// 現在地を取得locationAPI.getLocation {// 現在地の天気を取得weatherAPI.request(location) {weather = $0group.leave()}}group.notify(queue: .main) {guard !updateInfo.isUpdateRequired else {// アプリのアップデートを促す}// UIにデータを反映}}࿈ଓͨ͠ඇಉظॲཧͷՄಡੑ͕͍(ίʔυͷॲཧॱ্͕͔ΒԼʹྲྀΕ͍ͯͳ͍)ΞϓϦͷߋ৽νΣοΫ σʔλϚΠάϨʔγϣϯ ݱࡏऔಘݱࡏͷఱؾΛऔಘϚΠάϨʔγϣϯ݁ՌΛอଘUIʹөߋ৽͕͋ΕΞϥʔτΛग़͢
ϦΞΫςΟϒϑϨʔϜϫʔΫͷՄಡੑfunc configureApp() {Publishers.Zip3(// アプリの更新チェックforcedUpdate.checkUpdates(),// データマイグレーションdataMigrator.migration().map(saveMigrationResult),// 現在地の天気を取得locationAPI.getLocation().map(weatherAPI.request)).sink { (updateInfo, _, weather) inguard !updateInfo.isUpdateRequired else {// アプリのアップデートを促す}// UIにデータを反映}.store(in: &cancellables)}ίʔυྔݮΔ͕ɺΞϓϦͷߋ৽νΣοΫ σʔλϚΠάϨʔγϣϯ ݱࡏऔಘݱࡏͷఱؾΛऔಘUIʹөϚΠάϨʔγϣϯ݁ՌΛอଘߋ৽͕͋ΕΞϥʔτΛग़͢ɾΦϖϨʔλͷཧղ͕ඞཁɾσόοάͷқ্͕͕ΔɾετϦʔϜ͕͘ͳΔͱՄಡੑ͕େ͖͘མͪΔ(ϦΞΫςΟϒͰͳ͍γϯϓϧͳඇಉظॲཧʹෳࡶ)
Swift ConcurrencySwift 5ܥ
async/awaitfunc configureApp() async throws {// アプリの更新チェックasync let updateInfo = forcedUpdate.checkUpdates()// データマイグレーションasync let migrationResult = dataMigrator.migration()// 現在地の天気を取得async let weather = try weatherAPI.request(locationAPI.getLocation())// データマイグレーションの結果を保存await saveMigrationResult(migrationResult)guard await !updateInfo.isUpdateRequired else {// アプリのアップデートを促す}// UIにデータを反映}ಉظॲཧͷΑ͏ͳݟͨͷίʔυʹͳΓ ϑϩʔΛ͍͍͢ΞϓϦͷߋ৽νΣοΫ σʔλϚΠάϨʔγϣϯ ݱࡏऔಘݱࡏͷఱؾΛऔಘUIʹөϚΠάϨʔγϣϯ݁ՌΛอଘߋ৽͕͋ΕΞϥʔτΛग़͢
ഉଞ੍ޚͷߴ͍ҙࣝεϨουηʔϑͰͳ͍ૢ࡞Λ͢Δ࣌data race͕ൃੜ͠ͳ͍Α͏ʹҙ࣮ࣝͯ͢͠Δlet queue = DispatchQueue(label: "sample.code.qiitanight")var landmarksInRegion: [Region: [Landmark]] = [:]/// 現在地の区画が更新された時に呼ばれる/// - Parameter region: 現在地が含まれる区画func onUpdateRegion(_ region: Region) {// 周辺のランドマーク検索searchLandmarks(in: region) { [weak self] landmarks inqueue.async {self?.landmarksInRegion[region] = landmarks}}}
Actor@globalActorstruct LocationActor {actor ActorType {}static let shared = ActorType()}@LocationActor var landmarksInRegion: [Region: [Landmark]] = [:]/// 現在地の区画が更新された時に呼ばれる/// - Parameter region: 現在地が含まれる区画func onUpdateRegion(_ region: Region) async {// 周辺のランドマーク検索let landmarks = await searchLandmarks(in: region)landmarksInRegion[region] = landmarks}ActorΛ͏ͱσʔλڝ߹ՕॴΛϏϧυΤϥʔʹͰ͖Δ
Actor@globalActorstruct LocationActor {actor ActorType {}static let shared = ActorType()}@LocationActor var landmarksInRegion: [Region: [Landmark]] = [:]/// 現在地の区画が更新された時に呼ばれる/// - Parameter region: 現在地が含まれる区画@LocationActor func onUpdateRegion(_ region: Region) async {// 周辺のランドマーク検索let landmarks = await searchLandmarks(in: region)landmarksInRegion[region] = landmarks}SwiftίϯύΠϥʹνΣοΫΛͤΔ͜ͱͰ ࣮࣌ʹߟ͑Δ͜ͱɺίʔυϨϏϡʔͷෛ୲ݮΒͤΔ
Swift 5ܥͷSwift Concurrencyɾॲཧϑϩʔ͕͔Γ͍͢ɾഉଞ੍ޚ͕ඞཁͳΒActorΛ͑ྑ͍؆୯γϯϓϧɾഉଞ੍ޚ͕ඞཁͳ෦ΛίϯύΠϥ͕ڭ͑ͯ͘ΕΔ
Swift ConcurrencySwift 6
func run() {let ref = ReferenceValue()Task {ref.value += 1}}final class ReferenceValue {var value = 1}σʔλڝ߹νΣοΫͷݫີԽSwift 5ܥͰແܯࠂɺSwift 6ͰΤϥʔ❌ কདྷతʹσʔλڝ߹͕ى͜ΔՄೳੑ
Swift 6ͰϏϧυΤϥʔʹͳΔՕॴΛࣄલʹௐΔlet package = Package(...)package.targets.forEach {$0.swiftSettings = [.unsafeFlags(["-Xfrontend", "-warn-concurrency", "-Xfrontend", "-enable-actor-data-race-checks"])]}OTHER_SWIFT_FLAGS = -Xfrontend -warn-concurrency -Xfrontend -enable-actor-data-race-checksSwift 5ܥͰSwift 6ͰΤϥʔʹͳΔՕॴΛܯࠂʹͰ͖ΔSwiftPMͷ߹XcodeͰઃఆ͢Δ߹
Swift 5ͰܯࠂʹͰ͖Δfunc run() {let ref = ReferenceValue()Task {ref.value += 1}}final class ReferenceValue {var value = 1}
UIKitͷMainActorνΣοΫ༗ޮʹͳΔfunc updateUI() {let bounds = UIScreen.main.bounds// ϨΠΞτܭࢉ}@MainActor(unsafe) ͷνΣοΫ༗ޮʹͳΔͨΊUIKitΛ͍ͬͯΔ߹େม͔…কདྷతʹ@preconcurrencyͳͲͰஈ֊Ҡߦ͘͢͠ͳΔʁ
Swift 6Ͱى͜ΔมԽ (Swift Concurrency)• ୭Ͱڧ੍తʹ҆શͳඇಉظίʔυʹಋ͔ΕΔ• ίʔυϨϏϡʔσόοάͷίετΛݮΒͤΔ• αʔυύʔςΟΞϓϦͷίʔυͷasync/awaitԽ͕ਐΉSwift 6Ͱඇಉظॲཧ ͞Βʹ γϯϓϧ Ͱ ؆୯ ʹͳΔ
ࢀߟࢿྉɾOn the road to Swift 6ɹɾhttps://forums.swift.org/t/on-the-road-to-swift-6/32862ɾIncremental migration to concurrency checking ɹɾhttps://github.com/apple/swift-evolution/blob/main/proposals/0337-support-incremental-migration-to-concurrency-checking.mdɾPiecemeal adoption of Swift 6 improvements in Swift 5.x ɹɾhttps://forums.swift.org/t/piecemeal-adoption-of-swift-6-improvements-in-swift-5-x/57184ɾSendable and @Sendable closuresɹɾhttps://github.com/apple/swift-evolution/blob/main/proposals/0302-concurrent-value-and-concurrent-closures.md
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