Does it possible to override Objective C methods I found way

Question

Does it possible to override Objective C methods I found way to call them in this document <https github com JetBrains kotlin native blob master OBJC INTEROP md> but it s not clear of how to override them

olonho · Answer

Denis Shurygin · Answer

So The answer is no I m not sure that I right understand what is written in this paragraph

Denis Shurygin · Answer

Let me explain my question This document has an example of usage following Objective C methods ``` player moveTo LEFT byMeters 17 player moveTo UP byInches 42 ``` In Objective c overriding can look as following ``` void moveTo int direction byMeters double distance ``` But how do I override them in Kotlin Native

AnaR · Answer

I haven t done it yet But my guess it it would be how you d do regular kotlin inheritance I would try something like override fun moveTo direction Int byMeters double

svyatoslav.scherbina · Answer

gt But my guess it it would be how you d do regular kotlin inheritance Exactly

Denis Shurygin · Answer

I wish so But it s not working This two methods have same set of parameters for Kotlin ```override fun moveTo direction Int byMeters double override fun moveTo direction Int byInches double ``` They are equal from Kotlin piont of view But not for Objective C in case if you hawe two following methods ``` void moveTo int direction byMeters double distance void moveTo int direction byInches double distance```

svyatoslav.scherbina · Answer

gt They are equal from Kotlin piont of view They are not considered equal in this special case when overriding Objective C methods Have you tried to write such a code

Denis Shurygin · Answer

I tried to override following method of UIViewController iOS UIKit ``` func show vc UIViewController sender Any ``` Here is my implementation ``` override fun show vc UIViewController sender Any super show vc sender = sender ``` But I faced with 2 errors 1 string show overrides nothing 2 string Unresolved reference show I use konan plugin version 0 7 1

svyatoslav.scherbina · Answer

Yes because this method is imported to Kotlin as ``` open external fun showViewController vc UIViewController sender Any ``` and thus should be called and overridden using this signature

Denis Shurygin · Answer

Thank you Now it work

Denis Shurygin · Answer

Could you tell where did you get information about method signature

svyatoslav.scherbina · Answer

AppCode should show these signatures Also you can get them using `klib` command line util ``` $ bin klib contents klib platform ios arm64 UIKit gt log ```