Creating/Importing Kotlin multiplatform code for iOS

Question

I am trying out kotlin multiplatform and I have the common portion build and tested in Android and working fine but now I am trying to implement the code in iOS to try out. I see the gradle task in my build.gradle for iOS.

// This task attaches native framework built from ios module to Xcode project
// (see iosApp directory). Don't run this task directly,
// Xcode runs this task itself during its build process.
// Before opening the project from iosApp directory in Xcode,
// make sure all Gradle infrastructure exists (gradle.wrapper, gradlew).
task copyFramework {
    def buildType = project.findProperty('kotlin.build.type') ?: 'DEBUG'
    def target = project.findProperty('kotlin.target') ?: 'ios'
    dependsOn kotlin.targets."$target".binaries.getFramework(buildType).linkTask

    doLast {
        def srcFile = kotlin.targets."$target".binaries.getFramework(buildType).outputFile
        def targetDir = getProperty('configuration.build.dir')
        copy {
            from srcFile.parent
            into targetDir
            include 'app.framework/**'
            include 'app.framework.dSYM'
        }
    }
}

It says not to run the task directly but according to this guide it says to run it directly. When I run it directly I get an error saying

Execution failed for task ':app:copyFramework'.

Could not get unknown property 'configuration.build.dir' for task ':app:copyFramework' of type org.gradle.api.DefaultTask.

I dont know what I have to do to build this for iOS.

Can anyone help me out here on what to do?

Artyom Degtyarev · Accepted Answer · 2020-02-06 08:52:11Z

2

First of all, let's figure out what is going on here. As you have to use the Xcode project to implement the final app for iOS, the framework should be somehow added there at the build time. You are mixing two approaches here:

The copyFramework task, that should be run as a build stage of the Xcode build process. It copies produced framework to the Frameworks directory, to make it accessible from the Objective-C or Swift code. To learn where it is, this task depends on environment variables, that Xcode sets while executing the build. That the reason why you get an error here.
The task from the guide slightly differs from the first one. The main thing here is that packForXcode copies the framework to the designated directory ../../SharedCode/build/xcode-frameworks, and the Xcode project is already set to take frameworks from there(see this line). Therefore, the task does not depend on the Xcode build process and can be executed directly.

answered Feb 6, 2020 at 8:52

Artyom Degtyarev

2,89811 silver badges26 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

tyczj Over a year ago

Ah ok so all I had to do was build in Xcode and now I am able to see stuff from the common code (thought not what I expected but thats another issue). Kind of embarrassed I didnt just try to build it, I saw errors and just assumed something was wrong

Collectives™ on Stack Overflow

Creating/Importing Kotlin multiplatform code for iOS

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related