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Marco Gomiero @marcogomiero.com Senior Android Developer @ Airalo Google Developer Expert for Kotlin The rollercoaster of releasing an Android, iOS, and macOS app with Kotlin Multiplatform

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@marcogomiero.com FeedFlow Compose Multiplatform SwiftUI feed fl ow.dev/ Kotlin Multiplatform

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@marcogomiero.com feedflow.dev/ FeedFlow

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@marcogomiero.com feedflow.dev/ FeedFlow

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@marcogomiero.com FeedFlow feedflow.dev/

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@marcogomiero.com Distribution

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@marcogomiero.com Android • “Easy” for an Android Developer • Sign the app • Upload to Play Store

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@marcogomiero.com • Sign the app • Provisioning profiles • Upload to TestFlight • All handled by Xcode iOS

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@marcogomiero.com

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@marcogomiero.com • Sign the app • Provisioning profiles • Upload to TestFlight • All handled by Xcode (or manually on the CI) iOS

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@marcogomiero.com macOS - JVM App

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@marcogomiero.com No Xcode, need to go manual \o/

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@marcogomiero.com • JAR • “Manual” distribution • App Store macOS - Distribution ❌

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@marcogomiero.com macOS - “Manual” distribution • Sign the app • Notarization

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@marcogomiero.com https://developer.apple.com/documentation/security/notarizing_macos_software_before_distribution

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@marcogomiero.com

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@marcogomiero.com Notarization $ xcrun notarytool submit $BINARY_PATH --apple-id $APPLE_ID_NOTARIZATION --password $NOTARIZATION_PWD --team-id $APPSTORE_TEAM_ID --wait $ xcrun stapler staple $BINARY_PATH

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@marcogomiero.com Notarization ./gradlew notarizeDmg

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@marcogomiero.com macOS - “Manual” distribution • Sign the app • Notarization • Distribute the app

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@marcogomiero.com

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@marcogomiero.com macOS - App Store • Sign the app • Provisioning profiles • Upload to TestFlight

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@marcogomiero.com Upload to TestFlight: Transporter (or CI) https://apps.apple.com/us/app/transporter/id1450874784?mt=12

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@marcogomiero.com

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@marcogomiero.com

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@marcogomiero.com plist[PlistKeys.LSMinimumSystemVersion] = "10.13"

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@marcogomiero.com Fixed with Compose 1.6.10 https://github.com/JetBrains/compose-multiplatform/pull/4271

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@marcogomiero.com compose { desktop { application { macOS { minimumSystemVersion = "12.0" } } } } }

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@marcogomiero.com

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@marcogomiero.com

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@marcogomiero.com https://developer.apple.com/documentation/security/app_sandbox/protecting_user_data_with_app_sandbox

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@marcogomiero.com Native libraries on JVM • Native libraries are embedded in the dependencies jar • When needed, they are extracted and loaded

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@marcogomiero.com Without sandbox $TMPDIR

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@marcogomiero.com With sandbox

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@marcogomiero.com Native libraries on JVM • Cannot load “random” native library • Signing and embedding in the binary is the way

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@marcogomiero.com Find the native library 🕵 https://github.com/xerial/sqlite-jdbc

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@marcogomiero.com https://github.com/xerial/sqlite-jdbc/tree/master/src/main/resources/org/sqlite/native/Mac/aarch64

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@marcogomiero.com Embedding resources • /- • / • /common

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@marcogomiero.com compose.desktop.application.nativeDistributions { appResourcesRootDir.set(project.layout.projectDirectory.dir("resources")) }

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@marcogomiero.com val isSandboxed = System.getenv("APP_SANDBOX_CONTAINER_ID") != null if (isSandboxed) { val resourcesPath = System.getProperty("compose.application.resources.dir") // sqlite-jdbc System.setProperty("org.sqlite.lib.path", resourcesPath) } Load native libraries

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@marcogomiero.com val isSandboxed = System.getenv("APP_SANDBOX_CONTAINER_ID") != null if (isSandboxed) { val resourcesPath = System.getProperty("compose.application.resources.dir") // sqlite-jdbc System.setProperty("org.sqlite.lib.path", resourcesPath) } Load native libraries

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@marcogomiero.com val isSandboxed = System.getenv("APP_SANDBOX_CONTAINER_ID") != null if (isSandboxed) { val resourcesPath = System.getProperty("compose.application.resources.dir") // sqlite-jdbc System.setProperty("org.sqlite.lib.path", resourcesPath) } Load native libraries

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@marcogomiero.com Future improvements https://slack-chats.kotlinlang.org/t/16371916/hey-there-wave-i-m-trying-to-publish-my-app-on-the-mac-app-s#0be57312-7e43-4d30-add9-1cd5a0b7421b

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@marcogomiero.com 🎉

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@marcogomiero.com Crash Reporting & Logging

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@marcogomiero.com Firebase Crashlytics

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@marcogomiero.com https://github.com/touchlab/CrashKiOS

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@marcogomiero.com

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@marcogomiero.com Firebase Crashlytics Sentry Java SDK

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@marcogomiero.com Logging 🪵 https://github.com/touchlab/Kermit

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@marcogomiero.com val logger = Logger( config = StaticConfig( logWriterList = listOf( platformLogWriter(), crashReportingLogWriter(), ), ), tag = "FeedFlow", )

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@marcogomiero.com val logger = Logger( config = StaticConfig( logWriterList = listOf( platformLogWriter(), crashReportingLogWriter(), ), ), tag = "FeedFlow", )

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@marcogomiero.com val logger = Logger( config = StaticConfig( logWriterList = listOf( platformLogWriter(), crashReportingLogWriter(), ), ), tag = "FeedFlow", )

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@marcogomiero.com internal expect fun crashReportingLogWriter(): LogWriter actual fun crashReportingLogWriter(): LogWriter = CrashlyticsLogWriter() actual fun crashReportingLogWriter(): LogWriter = SentryLogWriter()

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@marcogomiero.com class SentryLogWriter : LogWriter() { override fun isLoggable(tag: String, severity: Severity): Boolean { // .. } override fun log( severity: Severity, message: String, tag: String, throwable: Throwable? ) { // .. } }

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@marcogomiero.com I18n

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@marcogomiero.com https://github.com/adrielcafe/lyricist

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, )

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) FeedFlowTheme { val lyricist = rememberFeedFlowStrings() ProvideFeedFlowStrings(lyricist) { MyAppEntrypoint() } }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) FeedFlowTheme { val lyricist = rememberFeedFlowStrings() ProvideFeedFlowStrings(lyricist) { MyAppEntrypoint() } } Text(text = LocalFeedFlowStrings.current.feedUrl)

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, )

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, regionCode: regionCode ) _feedFlowStrings = KotlinDependencies.shared.getFeedFlowStrings() } private var _feedFlowStrings: FeedFlowStrings? var feedFlowStrings: FeedFlowStrings { return _feedFlowStrings! }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, regionCode: regionCode ) _feedFlowStrings = KotlinDependencies.shared.getFeedFlowStrings() } private var _feedFlowStrings: FeedFlowStrings? var feedFlowStrings: FeedFlowStrings { return _feedFlowStrings! }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, single { when { languageCode == null -> EnFeedFlowStrings regionCode == null -> feedFlowStrings[languageCode] ?: EnFeedFlowStrings else -> { val locale = "${languageCode}_$regionCode" feedFlowStrings[locale] ?: feedFlowStrings[languageCode] ?: EnFeedFlowStrings } } }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, single { when { languageCode == null -> EnFeedFlowStrings regionCode == null -> feedFlowStrings[languageCode] ?: EnFeedFlowStrings else -> { val locale = "${languageCode}_$regionCode" feedFlowStrings[locale] ?: feedFlowStrings[languageCode] ?: EnFeedFlowStrings } } }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, single { when { languageCode == null -> EnFeedFlowStrings regionCode == null -> feedFlowStrings[languageCode] ?: EnFeedFlowStrings else -> { val locale = "${languageCode}_$regionCode" feedFlowStrings[locale] ?: feedFlowStrings[languageCode] ?: EnFeedFlowStrings } } }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, single { when { languageCode == null -> EnFeedFlowStrings regionCode == null -> feedFlowStrings[languageCode] ?: EnFeedFlowStrings else -> { val locale = "${languageCode}_$regionCode" feedFlowStrings[locale] ?: feedFlowStrings[languageCode] ?: EnFeedFlowStrings } } }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode, regionCode: regionCode ) _feedFlowStrings = KotlinDependencies.shared.getFeedFlowStrings() } private var _feedFlowStrings: FeedFlowStrings? var feedFlowStrings: FeedFlowStrings { return _feedFlowStrings! }

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@marcogomiero.com val feedFlowStrings: Map = mapOf( Locales.It to ItFeedFlowStrings, Locales.En to EnFeedFlowStrings, Locales.De to DeFeedFlowStrings, ) Text(feedFlowStrings.searchHintTitle) func startKoin() { let languageCode = Locale.current.language.languageCode?.identifier let regionCode = Locale.current.region?.identifier let koinApplication = doInitKoinIos( languageCode: languageCode,

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@marcogomiero.com Conclusions

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@marcogomiero.com Conclusions • Start from things you already know • Go incrementally • Exploring other planets enriches your vision

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@marcogomiero.com More reading https://www.marcogomiero.com/posts/2024/kmp-app-ci

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@marcogomiero.com Thank you! Marco Gomiero Senior Android Developer @ Airalo Google Developer Expert for Kotlin > Twitter: @marcoGomier > Github: prof18 > Website: marcogomiero.com > Mastodon: androiddev.social/@marcogom > BlueSky: @marcogomiero.com

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Bibliography / Useful Links • https: / / feedflow.dev/ • https: / / developer.apple.com/documentation/security/notarizing_macos_software_before_distribution • https: / / help.apple.com/itc/transporteruserguide/en.lproj/static.html#apd70774093eddb4 • https: / / developer.apple.com/documentation/security/app_sandbox/protecting_user_data_with_app_sandbox • https: / / github.com/JetBrains/compose-multiplatform/blob/master/tutorials/Native_distributions_and_local_execution/README.md#adding-files-to- packaged-application • https: / / slack-chats.kotlinlang.org/t/16371916/hey-there-wave-i-m-trying-to-publish-my-app-on-the-mac-app-s#0be57312-7e43-4d30- add9-1cd5a0b7421b • https: / / firebase.google.com/products/crashlytics • https: / / docs.sentry.io/platforms/java/ • https: / / github.com/touchlab/CrashKiOS • https: / / github.com/touchlab/Kermit • https: / / github.com/adrielcafe/lyricist • https: / / www.jetbrains.com/help/kotlin-multiplatform-dev/compose-images-resources.html#strings • https: / / www.marcogomiero.com/posts/2024/kmp-ci-android • https: / / www.marcogomiero.com/posts/2024/kmp-ci-ios • https: / / www.marcogomiero.com/posts/2024/kmp-ci-macos-github-releases • https: / / www.marcogomiero.com/posts/2024/kmp-ci-macos-appstore • https: / / www.marcogomiero.com/posts/2024/compose-macos-app-store/