val scaffoldState = rememberScaffoldState() 에서 빨간줄이 생기네요

늘 수고많으신 강사님의 노고에 감사드립니다

아래 코드중

val scaffoldState = rememberScaffoldState() 에서 빨간줄이 생기네요

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val viewModel = viewModel<MainViewModel>()
            HomeScreen(viewModel = viewModel)
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun HomeScreen(viewModel: MainViewModel) {
    val focusManager = LocalFocusManager.current

    val (inputUrl, setUrl) = rememberSaveable {
        mutableStateOf("https://www.google.com")
    }

    val scaffoldState = rememberScaffoldState()

    Scaffold (
        topBar = {
            TopAppBar(
                title = { Text("나의 웹브라우져")},
                actions = {
                    IconButton(onClick = {
                        viewModel.undo()
                    }){
                        Icon(
                            imageVector = Icons.Default.ArrowBack,
                            contentDescription = "back",
                            tint = Color.Black
                        )
                    }
                    IconButton(onClick = {
                        viewModel.redo()
                    }){
                        Icon(
                            imageVector = Icons.Default.ArrowForward,
                            contentDescription = "forward",
                            tint = Color.Black
                        )
                    }
                }
            )
        }
    ) { paddingValues ->
        Column(
            modifier = Modifier
                .padding(16.dp)
                .fillMaxSize()
        ) {
            OutlinedTextField(
                value = inputUrl,
                onValueChange = setUrl,
                label = { Text("https://")},
                modifier = Modifier
                    .padding(paddingValues)
                    .fillMaxWidth(),
                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Search),
                keyboardActions = KeyboardActions(onSearch = {
                    viewModel.url.value = inputUrl
                    focusManager.clearFocus()
                }),
            )
            Spacer(modifier = Modifier.height(16.dp))
            MyWebView(viewModel = viewModel)
        }
    }
}

@Composable
fun MyWebView(viewModel: MainViewModel) {
    val scope = rememberCoroutineScope()
    AndroidView(
        modifier = Modifier.fillMaxSize(),
        factory = {
            WebView(it).apply {
                settings.javaScriptEnabled = true
                webViewClient = WebViewClient()
                loadUrl("https://google.com")
            }
        },
        update = { webView ->
            webView.loadUrl(viewModel.url.value)
            scope.launch{
                viewModel.undoSharedFlow.collectLatest {
                    if(webView.canGoBack()) {
                        webView.goBack()
                    }
                }
            }
            scope.launch{
                viewModel.redoSharedFlow.collectLatest {
                    if(webView.canGoForward()) {
                        webView.goForward()
                    }
                }
            }
        },
    )