NavType是用来描述参数类型和值的类，它用于在不同目的地之间传递参数。在Jetpack Compose Navigation中，我们可以使用NavType来指定导航目的地之间传递的参数类型，包括基本类型（如Int和Boolean）、自定义类型（如data class）、Parcelable和Enum等。

以下是一个示例，在两个目的地之间传递一个参数： 定义NavType类型：

sealed class AppNavType {
    object Counter : NavType() {
        override fun get(bundle: Bundle, key: String): Int {
            return bundle.getInt(key)
        }
        override fun parseValue(value: String): Int {
            return value.toInt()
        }
        override fun put(bundle: Bundle, key: String, value: Int) {
            bundle.putInt(key, value)
        }
    }
}

定义两个目的地：

val navController = rememberNavController()
navController.graph = navController.createGraph(startDestination = "screen1") {
    destination("screen1") {
        action(route = "screen2/{count}") { backStackEntry ->
            val count =
                backStackEntry.arguments?.getInt("count") ?: throw IllegalArgumentException("Count is missing")
            if (count < 0) {
                throw IllegalArgumentException("Count can't be negative")
            }
            NavGraphBuilder(navController = navController).composeRoute("screen2/$count")
        }
    }
    destination("screen2/{count}") {
        val count = navArgument("count") {
            type = AppNavType.Counter
        }
        arg(type = AppNavType.Counter) {
            defaultValue = 0
            nullable = false
        }
        action(route = "") {
            NavGraphBuilder(navController = navController).popBackStack()
        }
    }
}

在screen1中跳转到screen2时传递参数：

Button(onClick = {
    navController.navigate("screen2/$count", navOptions {})
}) {
    Text(text = "Navigate with parameter")
}

在`screen