When I m trying to implement kotlin interface in swift my ap

Question

When I m trying to implement kotlin interface in swift my app crashes ``` Unrecognized selector ios IosApiRequestsMaker toKotlin 2018 05 19 05 15 48 277185+0500 ios 47861 1486398 Unrecognized selector ios IosApiRequestsMaker toKotlin ``` Is there way to fix it

olonho · Answer

to fix this issue as most others we need more context i e a minimal reproducer code snippet etc we cannot fix problem just from reading fragment of the error message

adev_one · Answer

Kotlin `interaface` ``` interface ApiRequestsMaker interface Callback fun onResponse httpCodeAndResponse Pair lt Int String gt fun onError e Throwable fun lt TEntity TResult Any TParams Any gt make request ApiRequest lt TEntity TResult TParams gt params TParams callback Callback ``` Swift implementation of `protocol` ``` class IosApiRequestsMaker NFApiRequestsMaker func make request NFApiRequest params Any callback NFApiRequestsMakerCallback print 123 callback onResponse httpCodeAndResponse NFStdlibPair first Int32 200 second ``` `build gradle` ``` buildscript ext kotlin version = 1 2 41 repositories jcenter maven url <https dl bintray com jetbrains kotlin native dependencies> dependencies classpath org jetbrains kotlin kotlin native gradle plugin 0 7 classpath org jetbrains kotlin kotlin gradle plugin $kotlin version allprojects repositories jcenter apply plugin konan konan targets = ios arm64 ios x64 konanArtifacts framework NF enableMultiplatform true dependencies lt gt ``` from stacktrace ``` ios`NFApiRequestsHandler allocating init apiRequestsMaker exceptionsProvider connectionChecker 0x104f714b0 lt +0 gt pushq rbp 0x104f714b1 lt +1 gt movq rsp rbp 0x104f714b4 lt +4 gt pushq r13 0x104f714b6 lt +6 gt subq $0x18 rsp 0x104f714ba lt +10 gt movq rdi 0x10 rbp 0x104f714be lt +14 gt movq r13 rdi 0x104f714c1 lt +17 gt movq rsi 0x18 rbp 0x104f714c5 lt +21 gt movq rdx 0x20 rbp 0x104f714c9 lt +25 gt callq 0x104f74076 symbol stub for swift getObjCClassFromMetadata 0x104f714ce lt +30 gt movq rax rdi 0x104f714d1 lt +33 gt callq 0x104f74016 symbol stub for objc allocWithZone 0x104f714d6 lt +38 gt movq 0x10 rbp rdi 0x104f714da lt +42 gt movq 0x18 rbp rsi 0x104f714de lt +46 gt movq 0x20 rbp rdx 0x104f714e2 lt +50 gt movq rax r13 0x104f714e5 lt +53 gt callq 0x104f73730 nonobjc ObjC NFApiRequestsHandler init apiRequestsMaker ObjC NFApiRequestsMaker exceptionsProvider ObjC NFApiExceptionsProvider connectionChecker ObjC NFConnectionChecker gt ObjC NFApiRequestsHandler at FeedViewController swift ``` `0x104f714ea lt +58 gt addq $0x18 rsp` ``` 0x104f714ee lt +62 gt popq r13 0x104f714f0 lt +64 gt popq rbp 0x104f714f1 lt +65 gt retq ``` Enviroment mac os x 10 13 4 latest iOS simulator

adev_one · Answer

Reproducer <https github com a dminator kn reproducer>

yusuf3000 · Answer

Mark `IosApiRequestsMaker` with ` objc` Your class then will then also need to subclass `NSObject`

yusuf3000 · Answer

``` objc class IosApiRequestsMaker NSObject NFApiRequestsMaker func make request NFApiRequest params Any callback NFApiRequestsMakerCallback print 123 callback onResponse httpCodeAndResponse NFStdlibPair first Int32 200 second ```

russhwolf · Answer

I think just extending NSObject will be sufficient unless something changed between 0 6 and 0 7 See here <https stackoverflow com questions 49092085 error when passing a swift implementation of a kotlin interface to a kotlin meth>

adev_one · Answer

Extending NSObject works Thanks