State don't update-CodePudding

My state don't update if I call the function: flipButtonClicked() Does someone know why?

class FlipCardViewModel(cardState: CardState): ViewModel() {
private var _state by mutableStateOf(
    cardState
)

val state: CardState
    get() = _state

fun flipButtonClicked(){
    _state.isFlipped = !_state.isFlipped
}}

CodePudding user response：

You need to assign new instance to _state, changing property of an Object doesn't trigger recomposition by default.

If your CardState is a data class you can do it as

fun flipButtonClicked(){
    _state = _state.copy(!_state.isFlipped)
}}

CodePudding user response：

Ma' man your state don't update cuz' you didn't do no reading of the docs.

Just initialise the state variable like

var state by mutableStateOf(cardState)

and update it like

state = state.copy(!state.isFlipped)

Why add unnecessary complicated third party calls?