many questions, is this a kmm project with jetbrains compose? or are you consuming a kmm project like a library?
How do you handle a button click in iOS natively? usually you forward the event to your viewmodel/viewcontroller.
The same principle in kmm, the only difference is you pass the event to the kmm view model. So your viewmodel would have a function
fun handleButtonClick()
and then in your swiftui you would do
viewmodel.handleButtonClick()