how to tell the UI to change the Values to a computed property

usually in iOS i will do a didSet but Kotlin does not provide the same, how can I do Such a thing.

`

val dnValues = stringArrayResource(R.array.dn_values_array)

val pnValuesSteel = stringArrayResource(R.array.pn_values_array_full)
val pnValuesGray = stringArrayResource(R.array.pn_values_array_gray_iron)
val pnValuesDuctile = stringArrayResource(R.array.pn_values_array_ductile_iron)

var pnValues = pnValuesGray

val materialValues = stringArrayResource(R.array.materials_array)

val newMaterial: (String) -> Unit = { material ->

    when (material) {
        materialValues[0] -> {
            pnValues = pnValuesGray
        }

        materialValues[1] -> {
            pnValues = pnValuesDuctile
        }

        materialValues[2] -> {
            pnValues = pnValuesSteel
        }
    }
}`

when I debug the code I see the pnValues change the way I want, but the UI never refresh on the edit.

I have tried the previous comments, because the Values get stuck on the remembered ones and the Custom picker won't work.

val dnValues = stringArrayResource(R.array.dn_values_array)

val pnValuesSteel = stringArrayResource(R.array.pn_values_array_full)
val pnValuesGray = stringArrayResource(R.array.pn_values_array_gray_iron)
val pnValuesDuctile =  stringArrayResource(R.array.pn_values_array_ductile_iron)

val materialValues = stringArrayResource(R.array.materials_array)

var assignedMaterial by remember { mutableStateOf("") }

val newMaterial: (String) -> Unit = { material ->

    when (material) {
        materialValues[0] -> {
            assignedMaterial = material
        }

        materialValues[1] -> {
            assignedMaterial = material
        }

        materialValues[2] -> {
            assignedMaterial = material
        }
    }
}

what I did was, just removing the pnValuesSteel, Gray, Ductile and set the correct one depending on the material which I retrieve from the chosen one on the picker. setting the pnValuesSteel, Gray, Ductile (values) I have done it in the same scope where it should be assigned. see below

        CircularList(
                    width = 60.dp,
                    itemHeight = 50.dp,
                    items = when (assignedMaterial) {
                        materialValues[0] -> {
                            pnValuesGray
                        }

                        materialValues[1] -> {
                            pnValuesDuctile
                        }

                        materialValues[2] -> {
                            pnValuesSteel
                        }
                        else ->{
                            pnValuesGray
                        }
                    }

now it works perfectly.

any comments on the solution would be appreciated.