在底部导航选项卡之间导航时，如何防止 Jetpack compose 中的 LazyColumn 重置位置？

Question

@Composable
fun HomeScreen(){
    val popularListState = rememberLazyListState()
    val viewModel: HomeViewModel = hiltNavGraphViewModel()
    val popularMovies: List<Movie> by viewModel.popularMoviesLiveData.observeAsState(emptyList())
    LazyColumn(
        state = popularListState
    ) {
        itemsIndexed(movies) { _, movie ->
            HomeMovieComponent(movie = movie)
        }
    }
}

每当从底部导航导航到其他屏幕时，惰性列会将滚动位置重置为顶部

Followed this guide to setup the bottom nav

Answer 1

每当您选择 BottomNavigationItem 时，您的可组合物被其他可组合物替换，并且当您选择返回时，它会再次重新初始化。要恢复以前的可组合使用 saveState = true 和 restoreState = true 在您的 BottomNavigationItem。

BottomNavigationItem(
    icon = { /*Some Icon*/ },
    label = { /*Some Text*/ },
    selected = currentRoute == item.route,
    onClick = {
      navController.navigate(item.route) {
        // Put These line in your code.
        popUpTo(navController.graph.startDestinationId) {
          saveState = true
        }
        launchSingleTop = true
        restoreState = true
      }
  }
)