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Marco Gomiero
Kotlin Budapest Meetup
Introducing
Kotlin Multiplatform
in an existing project
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Kotlin Budapest Meetup - @marcoGomier
Marco Gomiero
๐จ๐ป Android Engineer @ TIER ๐ด ๐ฉ๐ช ๐ฎ๐น
โจ
Google Developer Expert for Kotlin
> Twitter: @marcoGomier
โจ
> Github: prof18
โจ
> Website: marcogomiero.com
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Kotlin Budapest Meetup - @marcoGomier
Kotlin Multiplatform
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Kotlin Budapest Meetup - @marcoGomier
Kotlin Multiplatform
โข Not about compiling all code for all platforms
โข Share as much [NO UI] code as possible
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Kotlin Budapest Meetup - @marcoGomier
Common Kotlin
Kotlin/JVM Kotlin/JS Kotlin/Native
Java
Android
Browser
NodeJS
Android NDK
iOS
macOS
watchOS
tvOS
Linux
Windows
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Kotlin Budapest Meetup - @marcoGomier
Common Kotlin
Kotlin/JVM Kotlin/JS Kotlin/Native
Java
Android
Browser
NodeJS
Android NDK
iOS
macOS
watchOS
tvOS
Linux
Windows
Mobile App
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Kotlin Budapest Meetup - @marcoGomier https://kotlinlang.org/lp/mobile/
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Kotlin Budapest Meetup @marcoGomier
New Project
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Kotlin Budapest Meetup - @marcoGomier
New Projects: Android Studio plugin
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Kotlin Budapest Meetup - @marcoGomier
New Projects: Android Studio plugin
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Kotlin Budapest Meetup - @marcoGomier
Kotlin Budapest Meetup - @marcoGomier
.
โโโ kmm-project
โโโ androidApp
โโโ iosApp
โโโ shared
Same Repository
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Kotlin Budapest Meetup - @marcoGomier
shared
androidApp
Gradle Module
Android
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Kotlin Budapest Meetup - @marcoGomier
//
settings.gradle.kts
include(":shared")
//
build.gradle.kts
implementation(project(":shared"))
Android
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Kotlin Budapest Meetup - @marcoGomier
shared
androidApp iosApp
Gradle Module Framework
iOS
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Kotlin Budapest Meetup - @marcoGomier
New Projects: Android Studio plugin
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Kotlin Budapest Meetup - @marcoGomier
embedAndSignAppleFrameworkForXcode
https://blog.jetbrains.com/kotlin/2021/07/multiplatform-gradle-plugin-improved-for-connecting-kmm-modules/
packForXcode
From Kotlin 1.5.20
iOS
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Kotlin Budapest Meetup - @marcoGomier
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Kotlin Budapest Meetup - @marcoGomier
CocoaPods integration
https://kotlinlang.org/docs/reference/native/cocoapods.html
Pod
::
Spec.new do |spec|
spec.name = 'shared'
spec.version = '1.0-SNAPSHOT'
spec.homepage = 'Link to a Kotlin/Native module homepage'
spec.source = { :git
=>
"Not Published", :tag
=
>
"Cocoapods/
#{
spec.name}
#{
spec.authors = ''
spec.license = ''
spec.summary = 'Some description for a Kotlin/Native module'
spec.static_framework = true
spec.vendored_frameworks = "build/cocoapods/framework/shared.framework"
spec.libraries = "c
++
"
spec.module_name = "
# {
spec.name}_umbrella"
spec.pod_target_xcconfig = {
'KOTLIN_TARGET[sdk=iphonesimulator*]'
=>
'ios_x64',
'KOTLIN_TARGET[sdk=iphoneos*]'
=>
'ios_arm',
'KOTLIN_TARGET[sdk=watchsimulator*]'
=>
'watchos_x86',
'KOTLIN_TARGET[sdk=watchos*]'
=>
'watchos_arm',
'KOTLIN_TARGET[sdk=appletvsimulator*]'
= >
'tvos_x64',
'KOTLIN_TARGET[sdk=appletvos*]'
=>
'tvos_arm64',
'KOTLIN_TARGET[sdk=macosx*]'
= >
'macos_x64'
}
spec.script_phases = [
{
:name
= >
'Build shared',
:execution_position
= >
:before_compile,
:shell_path
=>
'/bin/sh',
:script
=> < <-
SCRIPT
set -ev
REPO_ROOT="$PODS_TARGET_SRCROOT"
"$REPO_ROOT/
..
/gradlew" -p "$REPO_ROOT" :shared:syncFramework \
-Pkotlin.native.cocoapods.target=$KOTLIN_TARGET \
-Pkotlin.native.cocoapods.configuration=$CONFIGURATION \
-Pkotlin.native.cocoapods.cflags="$OTHER_CFLAGS" \
-Pkotlin.native.cocoapods.paths.headers="$HEADER_SEARCH_PATHS" \
-Pkotlin.native.cocoapods.paths.frameworks="$FRAMEWORK_SEARCH_PATHS"
SCRIPT
}
]
end
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Kotlin Budapest Meetup - @marcoGomier
iOS Project: Podfile
pod 'shared', :path
=>
'
..
/shared'
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Kotlin Budapest Meetup @marcoGomier
Existing Project
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Kotlin Budapest Meetup - @marcoGomier
Photo by Ashkan Forouzani on Unsplash
๐
shared
androidApp iosApp
Gradle
Module
Framework
Same Repository
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Kotlin Budapest Meetup - @marcoGomier
Photo by Erwan Hesry on Unsplash
๐ก Create a library!
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Kotlin Budapest Meetup - @marcoGomier
Photo by Erwan Hesry on Unsplash
A little piece of tech
stack to start with
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Kotlin Budapest Meetup - @marcoGomier
โข Boring code to write multiple times
โข Code/feature that centralises the source of truth (i.e. a field
is nullable or not)
โข Code/feature that can be gradually extracted
Where to start?
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Kotlin Budapest Meetup - @marcoGomier
โข DTOs
โข Common Models
โข Utility methods, aka `object Utils {}`
โข Analytics
โข
. . .
Where to start?
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Existing Projects: Intellij Wizard
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Common Kotlin
Android App iOs App
.aar Framework
โจ
Maven
โจ
Cocoa Repo
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Kotlin Budapest Meetup - @marcoGomier
Common Kotlin
Android App iOs App
.aar Framework
โจ
Maven
โจ
Cocoa Repo
Android App Repository
KMP Repository
iOs App Repository
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How to publish: Android
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Kotlin Budapest Meetup - @marcoGomier https://github.com/prof18/shared-hn-android-ios-backend
* based on a true story project
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plugins {
//..
.
id("maven-publish")
}
group = "com.prof18.hn.foundation"
version = "1.0"
publishing {
repositories {
maven{
credentials {
username = "username"
password = "pwd"
}
url = url("https:
//
mymavenrepo.it")
}
}
}
Setup a Maven repository to share the artifacts: build.gradle.kts
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Kotlin Budapest Meetup - @marcoGomier
Publish the artifacts
./gradlew publish
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Kotlin Budapest Meetup - @marcoGomier
Publish the artifacts
./gradlew publish
./gradlew publishToMavenLocal
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Android
implementation(โcom.prof18.hn.foundation:hn-foundation-android:2.0.0")
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Kotlin Budapest Meetup @marcoGomier
How to publish: iOS
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๐ฅต
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Kotlin Budapest Meetup - @marcoGomier
embedAndSignAppleFrameworkForXcode
packForXcode
CocoaPods integration
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Kotlin Budapest Meetup - @marcoGomier
๐ค
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Kotlin Budapest Meetup - @marcoGomier
XCFramework
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Kotlin Budapest Meetup - @marcoGomier
NEW
https://devstreaming-cdn.apple.com/videos/wwdc/2019/416h8485aty341c2/416/416_binary_frameworks_in_swift.pdf
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Kotlin Budapest Meetup - @marcoGomier https://devstreaming-cdn.apple.com/videos/wwdc/2019/416h8485aty341c2/416/416_binary_frameworks_in_swift.pdf
NEW
iOS mac
OS
watch
OS
tvOS
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Kotlin Budapest Meetup - @marcoGomier
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Kotlin Budapest Meetup - @marcoGomier
https:
//
developer.apple.com/videos/play/wwdc2019/416/
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XCFramework
Official Support from Kotlin 1.5.30
https://kotlinlang.org/docs/whatsnew1530.html#support-for-xcframeworks
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XCFramework prior to Kotlin 1.5.30
https://github.com/prof18/kmp-xcframework-sample/blob/pre-kotlin-1.5.30/build.gradle.kts#L86
register("buildReleaseXCFramework", Exec
::
class.java) {
description = "Create a Release XCFramework"
dependsOn("link${libName}ReleaseFrameworkIosArm64")
dependsOn("link${libName}ReleaseFrameworkIosX64")
val arm64FrameworkPath = "$rootDir/build/bin/iosArm64/${libName}ReleaseFramework/${libName}.framework"
val arm64DebugSymbolsPath =
"$rootDir/build/bin/iosArm64/${libName}ReleaseFramework/${libName}.framework.dSYM"
val x64FrameworkPath = "$rootDir/build/bin/iosX64/${libName}ReleaseFramework/${libName}.framework"
val x64DebugSymbolsPath = "$rootDir/build/bin/iosX64/${libName}ReleaseFramework/${libName}.framework.dSYM"
val xcFrameworkDest = File("$rootDir/
..
/kmp-xcframework-dest/$libName.xcframework")
executable = "xcodebuild"
args(mutableListOf().apply {
add("-create-xcframework")
add("-output")
add(xcFrameworkDest.path)
//
Real Device
add("-framework")
add(arm64FrameworkPath)
add("-debug-symbols")
add(arm64DebugSymbolsPath)
//
Simulator
add("-framework")
add(x64FrameworkPath)
add("-debug-symbols")
add(x64DebugSymbolsPath)
})
doFirst {
xcFrameworkDest.deleteRecursively()
}
}
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Kotlin Budapest Meetup - @marcoGomier
XCFramework prior to Kotlin 1.5.30
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Kotlin Budapest Meetup - @marcoGomier
XCFramework prior to Kotlin 1.5.30
https:
/
/
www.marcogomiero.com/posts/2021/build-xcframework-kmp/
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XCFramework: build.gradle.kts
https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
val libName = "LibraryName"
kotlin {
val xcFramework = XCFramework(libName)
ios {
binaries.framework(libName) {
xcFramework.add(this)
}
}
...
}
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XCFramework: build.gradle.kts
https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
val libName = "LibraryName"
kotlin {
val xcFramework = XCFramework(libName)
ios {
binaries.framework(libName) {
xcFramework.add(this)
}
}
...
}
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Kotlin Budapest Meetup - @marcoGomier
XCFramework: build.gradle.kts
https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
val libName = "LibraryName"
kotlin {
val xcFramework = XCFramework(libName)
ios {
binaries.framework(libName) {
xcFramework.add(this)
}
}
...
}
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Kotlin Budapest Meetup - @marcoGomier
XCFramework: build.gradle.kts
https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts
import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
val libName = "LibraryName"
kotlin {
val xcFramework = XCFramework(libName)
ios {
binaries.framework(libName) {
xcFramework.add(this)
}
}
...
}
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assemble${libName}XCFramework
assemble${libName}DebugXCFramework
assemble${libName}ReleaseXCFramework
XCFramework: Gradle tasks
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Kotlin Budapest Meetup - @marcoGomier
.
โโโ build
โโโ XCFrameworks
โโโ debug
โ โโโ LibraryName.xcframework
โโโ release
โโโ LibraryName.xcframework
XCFramework
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Kotlin Budapest Meetup - @marcoGomier https://github.com/prof18/hn-foundation-cocoa-xcframework
CocoaPod Repository
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HNFoundation.podspec
https://github.com/prof18/hn-foundation-cocoa-xcframework/blob/main/HNFoundation.podspec
Pod
::
Spec.new do |s|
# โโโ Spec Metadata โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ #
#
# These will help people to find your library, and whilst it
# can feel like a chore to fill in it's definitely to your advantage. The
# summary should be tweet-length, and the description more in depth.
#
s.name = "HNFoundation"
s.version = "2.0.0"
s.summary = "HNFoundation KMP library"
s.homepage = "https:
//
github.com/prof18/hn-foundation-cocoa-xcframework"
s.license = "Apache"
s.author = { "Marco Gomiero"
= >
"[email protected]" }
s.vendored_frameworks = 'HNFoundation.xcframework'
s.source = { :git
=>
"[email protected]:prof18/hn-foundation-cocoa-xcframework", :tag
=>
"
#{
s.version}" }
s.exclude_files = "Classes/Exclude"
end
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No content
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https:
//
guides.cocoapods.org/making/private-cocoapods.html
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iOs Project: Podfile
# For develop releases:
pod 'HNFoundation', :git
=>
โ[email protected]:prof18/hn-foundation-cocoa-xcframework.git", :branch
=
>
'develop'
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iOs Project: Podfile
# For develop releases:
pod 'HNFoundation', :git
=>
โ[email protected]:prof18/hn-foundation-cocoa-xcframework.git", :branch
= >
'develop'
# For stable releases
pod 'HNFoundation', :git
=>
โ[email protected]:prof18/hn-foundation-cocoa-xcframework.git", :tag
=>
โ2.0.0'
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register("publishDevFramework") {
description = "Publish iOs framework to the Cocoa Repo"
doFirst {
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "checkout", "develop").standardOutput
}
}
dependsOn("assemble${libName}DebugXCFramework")
doLast {
copy {
from("$buildDir/XCFrameworks/debug")
into("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
}
.. ..
https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts#L110
Publish Dev Framework Task
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workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "checkout", "develop").standardOutput
}
}
dependsOn("assemble${libName}DebugXCFramework")
doLast {
copy {
from("$buildDir/XCFrameworks/debug")
into("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
}
val dir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec")
val tempFile = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec.new")
val reader = dir.bufferedReader()
val writer = tempFile.bufferedWriter()
var currentLine: String?
while (reader.readLine().also { currLine
->
currentLine = currLine }
!=
null) {
if (currentLine
?.
startsWith("s.version")
==
true) {
writer.write("s.version = \"${libVersionName}\"" + System.lineSeparator())
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into("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
}
val dir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec")
val tempFile = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec.new")
val reader = dir.bufferedReader()
val writer = tempFile.bufferedWriter()
var currentLine: String?
while (reader.readLine().also { currLine
->
currentLine = currLine }
!=
null) {
if (currentLine
?.
startsWith("s.version")
==
true) {
writer.write("s.version = \"${libVersionName}\"" + System.lineSeparator())
} else {
writer.write(currentLine + System.lineSeparator())
}
}
writer.close()
reader.close()
val successful = tempFile.renameTo(dir)
if (successful) {
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
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if (successful) {
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "add", ".").standardOutput
}
val dateFormatter = SimpleDateFormat("dd/MM/yyyy - HH:mm", Locale.getDefault())
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine(
"git",
"commit",
"-m",
"\"New dev release: ${libVersionName}-${dateFormatter.format(Date())}\""
).standardOutput
}
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "push", "origin", "develop").standardOutput
}
}
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https://github.com/prof18/shared-hn-android-ios-backend/blob/main/hn-foundation/build.gradle.kts#L177
Publish Release Framework Task
register("publishFramework") {
description = "Publish iOs framework to the Cocoa Repo"
doFirst {
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "checkout", "main").standardOutput
}
}
dependsOn("assemble${libName}ReleaseXCFramework")
doLast {
copy {
from("$buildDir/XCFrameworks/release")
into("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
}
.. ..
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project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "checkout", "main").standardOutput
}
}
dependsOn("assemble${libName}ReleaseXCFramework")
doLast {
copy {
from("$buildDir/XCFrameworks/release")
into("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
}
val dir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec")
val tempFile = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework/$libName.podspec.new")
val reader = dir.bufferedReader()
val writer = tempFile.bufferedWriter()
var currentLine: String?
while (reader.readLine().also { currLine
->
currentLine = currLine }
!=
null) {
if (currentLine
?.
startsWith("s.version")
==
true) {
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project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "add", ".").standardOutput
}
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "commit", "-m", "\"New release: ${libVersionName}\"").standardOu
}
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "tag", libVersionName).standardOutput
}
project.exec {
workingDir = File("$rootDir/
..
/
..
/hn-foundation-cocoa-xcframework")
commandLine("git", "push", "origin", "main", "
--
tags").standardOutput
}
}
}
}
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๐
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Concurrency
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โข Kotlin/Native different from the JVM
โข One thread
->
no problems, you can use mutable objects
โข Many thread
-
>
only immutable objects
Concurrency
https://kotlinlang.org/docs/mobile/concurrency-overview.html
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Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException:
illegal attempt to access non-shared @c2ddb8 from other thread
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๐ฅถ Freeze the object to share
it between threads
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override fun deserialize(jsonString: String): NewsDTO {
val newsDTO: NewsDTO = json.decodeFromString(jsonString)
newsDTO.freeze()
return newsDTO
}
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Kotlin Budapest Meetup - @marcoGomier https://blog.jetbrains.com/kotlin/2021/08/try-the-new-kotlin-native-memory-manager-development-preview/
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Conclusions
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Faced [and resolved] difficulties
โข How to organise the project without a monorepo
โข How to effectively distribute the iOS framework
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Start little
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Kotlin Budapest Meetup - @marcoGomier
Start little
Go bigger
then
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Start little then go bigger
โข Validate the process with โlittleโ effort
โข Then you can go bigger and share more โfeaturesโ
โจ
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Bibliography / Useful Links
โข https:
/ /
kotlinlang.org/lp/mobile/
โข https:
/ /
www.marcogomiero.com/posts/2020/my-2cents-cross-platform/
โข https:
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giansegato.com/essays/a-technical-framework-for-early-stage-startups/
โข https:
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giansegato.com/essays/the-ebb-and-the-flow-of-product-development/
โข https:
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www.marcogomiero.com/posts/2021/build-xcframework-kmp/
โข https:
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www.marcogomiero.com/posts/2021/kmp-xcframework-official-support/
โข https:
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www.marcogomiero.com/posts/2020/kotlin-serialization-alamofire/
โข https:
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www.marcogomiero.com/posts/2021/kmp-existing-project/
โข https:
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www.youtube.com/watch?v=oxQ6e1VeH4M
โข https:
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dev.to/kpgalligan/series/3739
โข https:
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blog.jetbrains.com/kotlin/2021/08/try-the-new-kotlin-native-memory-manager-
development-preview/
Slide 80
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Marco Gomiero
Kotlin Budapest Meetup
Thank you!
> Twitter: @marcoGomier
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> Github: prof18
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> Website: marcogomiero.com