我的应用程序有一个带有脚手架和底部导航栏的主屏幕:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
val navController = rememberNavController()
MyApplicationTheme {
Scaffold(
bottomBar = {
BottomBar(navController = navController)
}
) {
NavigationGraph(navController = navController)
}
}
}
}
...
@Composable
fun NavigationGraph(navController: NavHostController){
NavHost(navController = navController, startDestination = BottomMenuOption.Home.route) {
composable(route = BottomMenuOption.Home.route) {
HomeScreen(navController = navController)
}
composable(route = BottomMenuOption.Settings.settings) {
SettingsScreen()
}
composable(route = BottomMenuOption.Profile.route) {
ProfileScreen()
}
composable(route = "feature") {
FeatureScreen()
}
}
}
FeatureScreen
有自己的Scaffold
,使用topBar
而不是BottomBar,当我从HomeScreen
导航到它时,我想替换主屏幕中的前一个,只看到顶部栏,但我在屏幕上看到了两个栏。
@Composable
fun FeatureScreen() {
Scaffold (
topBar = {
TopBar(" Feature Screen")
}
) {
}
}
有可能做到这一点吗?我认为只需使用一项新活动即可完成,但理想情况下,我希望保留单一活动方法。
我建议创建一个新函数,如下所示:
@Composable
fun MainScaffold(
topBar: @Composable (() -> Unit) = {},
bottomBar: @Composable (() -> Unit) = {},
content: @Composable (PaddingValues) -> Unit){
Scaffold(
bottomBar = bottomBar,
topBar = topBar,
content = content
)
}
然后,在屏幕上使用这个主脚手架:
@Composable
fun HomeScreen(navController: NavHostController) {
MainScaffold(
bottomBar = { BottomBar(navController = navController) },
content = {
// content
})
}
在您的功能屏幕中:
@Composable
fun FeatureScreen() {
MainScaffold (
topBar = {
TopBar(" Feature Screen")
}
) {
//content
}
}
和集合内容
setContent {
val navController = rememberNavController()
VoiceAssistantJetpackComposeTheme {
NavigationGraph(navController = navController)
}}