未解决的参考：平台，在多平台项目中

Question

我创建了一个kotlin共享库项目（使用Windows上的Android Studio），android方面可以正常工作，但是由于某种原因，当在Kotlin中编写iOS特定代码时，我似乎无法导入{{1 }}库。我正在按照here的说明进行操作。

我确实将platform放入了include ':Shared'，并将这个settings.gradle放入了我的应用implementation project(':Shared')

我的最终目标是让该库具有将在iOS和Android之间共享的业务逻辑。我只是想让一个示例项目运行，以便我知道它可以工作。

这是我的文件结构：

我的build.gradle模块的build.gradle：

Shared

apply plugin: 'java-library' apply plugin: 'kotlin-multiplatform' /*We are doing three things in the codebase below: 1. Listing out the target for the shared code. For Android, JVM target. For iOS, target depends on the device type, i.e. simulator or a real device. 2. We have defined iOS, Android and common source sets, which will allow different configuration for each source set. 3. We have created a task for Xcode to generate framework and add it to our iOS project. */ kotlin{ targets{ // //Xcode sets SDK_NAME environment variable - based on whether the // //target device is a simulator or a real device, the preset should vary final def iOSTarget = System.getenv('SDK_NAME')?.startsWith("iphoneos") \ ? presets.iosArm64 : presets.iosX64 //outputKinds - FRAMEWORK would mean that the shared code would be exported as a FRAMEWORK // EXECUTABLE - produces a standalone executable that can be used to run as an app fromPreset(iOSTarget, 'ios'){ binaries{ framework('Shared') } } //create a target for Android from presets.jvm fromPreset(presets.jvm, 'android') } //we have 3 different sourceSets for common, android and iOS. //each sourceSet can have their own set of dependencies and configurations sourceSets{ commonMain.dependencies{ api 'org.jetbrains.kotlin:kotlin-stdlib-common' } androidMain.dependencies{ api 'org.jetbrains.kotlin:kotlin-stdlib' implementation fileTree(dir: 'libs', include: ['*.jar']) implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" } iosMain{ } } } configurations{ compileClasspath } // This task attaches native framework built from ios module to Xcode project // Don't run this task directly, // Xcode runs this task itself during its build process when we configure it. // make sure all Gradle infrastructure exists (gradle.wrapper, gradlew) //and gradlew is in executable mode (chmod +x gradlew) task packForXCode(type: Sync) { final File frameworkDir = new File(buildDir, "xcode-frameworks") final String mode = project.findProperty("XCODE_CONFIGURATION")?.toUpperCase() ?: 'DEBUG' final def framework = kotlin.targets.ios.binaries.getFramework("Shared", mode) inputs.property "mode", mode dependsOn framework.linkTask from { framework.outputFile.parentFile } into frameworkDir doLast { new File(frameworkDir, 'gradlew').with { text = "#!/bin/bash\nexport 'JAVA_HOME=${System.getProperty("java.home")}'\ncd '${rootProject.rootDir}'\n./gradlew \$@\n" setExecutable(true) } } } tasks.build.dependsOn packForXCode sourceCompatibility = "1.7" targetCompatibility = "1.7" 代码：

commonMain

//This function will be the general function declaration that will be used as //actual in our platform specific code. expect fun getCurrentDate() : String //This is the common function that will be called by Android and iOS app fun getDate():String{ return "Current Date is ${getCurrentDate()}" } 代码：

androidMain

import java.util.* actual fun getCurrentDate(): String{ return Date().toString() } 代码（这是问题所在）：

iosMain

我的Android //can't get this import to work. //import platform.Foundation.NSDate actual fun getCurrentDate(): String{ //return NSDate().toString() return "" } （可行）：

MainActivity

对于平台库为何不起作用的任何帮助或建议，将深表感谢。

Answer 1

我只是在Windows上尝试过此操作，而iOS平台似乎不可用，甚至仅可用于导入。我认为您将无法在Windows上编辑Apple目标。本地可用的目标是：

android_arm32/
android_arm64/
android_x64/
android_x86/
linux_arm32_hfp/
linux_arm64/
linux_x64/
mingw_x64/
mingw_x86/

您可以在此处查看本地目标：~/.konan/kotlin-native-windows-1.3.72/klib/platform