[Jetpack Compose] navigation 구조 및 적용

                                    implementation("androidx.navigation:navigation-compose:2.7.3") // 최신 버전

                                    package com.example.myapplication.navigation

import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.navigation.NavHostController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController

@Composable
fun XNavHost(
    modifier: Modifier = Modifier,
    navController: NavHostController = rememberNavController(), // liabrary에서 Controller 가져옴
    startDestination: String = "home"
) {
    NavHost(   // compose에 구현된 NavHost이다.
        modifier = modifier,
        navController = navController, // NavHost를 사용하려면 Controller를 필수로 넘겨줘야 한다.
        startDestination = startDestination
    ) {
        // nav graph
        composable("home") { HomeScrren() }      // Graph를 생성 : detination을 명시-표시할 Screen
        composable("log-in") { LogInScreen() }
        composable("sign-up") { SignUpScreen() }

    }
}

                                    class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyApplicationTheme {
                XNavHost()
            }
        }
    }
}

                                    @Composable
fun MyApp() {
    MyApplicationTheme {
        XNavHost()
    }
}