For iOS, anyone know a resource for how to define CPointers? Im trying to do something like this: ``...

# multiplatform

[Mgj]

For iOS, anyone know a resource for how to define CPointers? Im trying to do something like this:

val view: UITextField
view.addTarget(target = view, action = ::onTextChanged, forControlEvents = UIControlEventEditingChanged)

But its not allowed because Required: COpaguePointer? Found: KFunction0

Apparently theres an toCPointer() function? I cant seem to import it, so im unsure how its to be used

[Kris Wong]

addTarget(
                target = this@FeatureDataSource,
                action = sel_registerName("onFeatureToggled:"),
                forControlEvents = UIControlEventValueChanged
            )

[Mgj]

Thank you. I actually saw the sel_registerName but im not sure how to do closures with it. For example i'd like to pass my own extra argument to it, is that possible?

[Kris Wong]

no

[Kris Wong]

iOS doesn't support that

[Kris Wong]

IIRC you can take 0 or 1 argument, and if you take 1, it will be the control itself

[Mgj]

That makes sense. But the action argument seems to accept a pointer and if thats true i should be able to include any closures i want if im able to pass an arbitrary function pointer

[Mgj]

ofc i cannot do that if sel_registerName is the only way to do it 😕

[Kris Wong]

it must be a @ObjCAction fun or it will crash at runtime

[Mgj]

I see

[Kris Wong]

in my case i created a map of control to data

[Mgj]

My real issue is actually that i want to bind an UITextField to a MutableStateFlow<String> (two-way, input to TextField should change value of StateFlow, and vice versa).
It seems like swift has very limited support for StateFlow e.g. i dont seem to be able to use onEach in swift so i figured i'd try to do the binding in kotlin

[Mgj]

Guess i could technically do the StateFlow->TextField subscription in kotlin and the TextField->StateFlow in swift but that seems like a very messy solution