iOS target

Learn the iOS target with KMP.

iOS target

In KMP the iOS target compiles Kotlin code into a framework for iOS apps. Swift or Objective-C can call this framework.

The target is added in Gradle with iosArm64() (device), iosX64() (Intel simulator) and iosSimulatorArm64() (Apple Silicon simulator) blocks. The output is a framework that is embedded into an Xcode project. The iosTarget function in this lesson shows the concept with a simple model.

The framework output

The framework produced by the iOS target is embedded into the Xcode project. On the Swift side it is imported with import.

In Gradle the binaries { framework { baseName = "Shared" } } block sets the framework name. Swift code calls import Shared to use Kotlin classes. Type mapping is automatic: Kotlin String maps to Swift String, List to Array. This is the bridge between iOS and shared code.

Exercise Write iosTarget

Define fun iosTarget(): String. It should return "iOS". In main, write println(iosTarget()).

Show example solution

fun iosTarget(): String = "iOS"
fun main() {
    println(iosTarget())
}

Test yourself

What does the iosArm64() block produce?
```
The iOS output is a framework.
```
- .jar file
- framework
- .exe file
- .so file
Show answer

framework — iosArm64() produces a framework for iOS.

Complete the iosArm64 call

____() {
    binaries { framework() }
}

Show answer

iosArm64() {
    binaries { framework() }
}

Match the iOS parts

iosArm64()

iPhone
iosX64()

Intel simulator
framework

iOS library
Swift

calls framework

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