Writing Swift-Friendly Kotlin Multiplatform APIs — Part 1

*This list contains some important notes and solutions for common issues in KMP projects So I will sum up these articles into a form of points like this

[Issue Title]

? Normal kotlin implementation

? The issue in swift code

? The solution in kotlin to fix the issue

? The solution in swift side [if there]

-[Issue Title] Calling Methods Versus Sending Messages

-Normal kotlin implementation:

fun findElementInList(elem: Int, list: List<Int>): Int = list.indexOf(elem)        

-The issue in swift code:

let index = ExampleKt.findElementInList(elem: 1, list: [1, 2, 3])        

Swift requires parameter names to be specified explicitly when calling functions, unlike Kotlin.

--The solution in kotlin to fix the issue:

@OptIn(ExperimentalObjCName::class)
@ObjCName("find")
fun findElementInList(@ObjCName("element") elem: Int, @ObjCName("in") list:
List<Int>): Int = list.indexOf(elem)        

-Using @OptIn(ExperimentalObjCName::class) and @ObjCName annotation to specify Objective-C and Swift names for symbols.

--The solution in swift side [if there]:

let index = ExampleKt.find(element: 1, in: [1, 2, 3])        

Calling the function with explicit parameter names, or with external parameter name as _ to allow omission of parameter name when calling the function in Swift.