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https://github.com/ttypic/swift-klib-plugin

Gradle Plugin for injecting Swift code into Kotlin Multiplatform Mobile shared module
https://github.com/ttypic/swift-klib-plugin

gradle gradle-plugin ios kotlin kotlin-multiplatform kotlin-multiplatform-mobile kotlin-native swift swift-kotlin

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Gradle Plugin for injecting Swift code into Kotlin Multiplatform Mobile shared module

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Swift Klib library logo

# Swift Klib Gradle Plugin

![badge-ios](https://img.shields.io/badge/platform-ios-light)
![badge-mac](https://img.shields.io/badge/platform-macos-light)
![badge-tvos](https://img.shields.io/badge/platform-tvos-light)
![badge-watchos](https://img.shields.io/badge/platform-watchos-light)

This gradle plugin provides easy way to include your Swift source files in your **Kotlin Multiplatform Mobile**
shared module and access them in Kotlin via `cinterop` for iOS targets. It is useful for:

* Accessing Swift-only libraries _(e.g. CryptoKit)_
* Creating a Kotlin-Friendly Swift API
* Learning how Swift <-> Kotlin interoperability works

**Note:** _Plugin has been tested on Gradle 7.5+, Xcode 15+_

## Installation

Using the [plugins DSL](https://docs.gradle.org/current/userguide/plugins.html#sec:plugins_block):

```kotlin
plugins {
id("io.github.ttypic.swiftklib") version "0.5.1"
}
```

Using [legacy plugin application](https://docs.gradle.org/current/userguide/plugins.html#sec:old_plugin_application):

```kotlin
buildscript {
repositories {
maven {
url = uri("https://plugins.gradle.org/m2/")
}
}
dependencies {
classpath("io.github.ttypic:plugin:0.5.1")
}
}

apply(plugin = "io.github.ttypic.swiftklib")
```

## Usage

Plugin works together with [Kotlin Multiplatform plugin](https://plugins.gradle.org/plugin/org.jetbrains.kotlin.multiplatform).

### Prepare Swift code

Place your Swift files inside your project in separate folder (e.g. `native/HelloSwift`).

Make sure that Swift API you want to expose to Kotlin is [compatible with Objective-C](https://lazarevzubov.medium.com/compatible-with-objective-c-swift-code-e7c3239d949).

```swift
@objc public class HelloWorld : NSObject {
@objc public class func helloWorld() -> String {
return "HeLLo WorLd!"
}
}
```

### Setup swiftklib extension

Then you need to add `cinterop` for target platforms in your **Kotlin Multiplatform Plugin**. There is
no need to configure it or add `.def` file, all configuration will be done automatically by **Swift Klib**.

```kotlin
kotlin {
listOf(
iosX64(),
iosArm64(),
iosSimulatorArm64(),
).forEach {
it.compilations {
val main by getting {
cinterops {
create("HelloSwift")
}
}
}
}

//...
}
```

And finally provide settings for it in `swiftklib` extension.
You need to specify `path` and `packageName` parameters.

```kotlin
swiftklib {
create("HelloSwift") {
path = file("native/HelloSwift")
packageName("com.ttypic.objclibs.greeting")
}
}
```

### Examples

More samples can be found in the [examples/](https://github.com/ttypic/swift-klib-plugin/tree/main/examples) folder.

## License

This package is licensed under MIT license.