Drilling Down with SwiftUI and Navigation Stack

Drilling Down with SwiftUI and Navigation Stack

import SwiftUI

struct CarDetail: Identifiable {
    var id = UUID()
    var info: String
}

struct CarYear: Identifiable {
    var id = UUID()
    var info: String
    var detail: CarDetail
}

struct CarModel: Identifiable {
    var id = UUID()
    var info: String
    var carYear: CarYear
}

struct CarMake: Identifiable {
    var id = UUID()
    var info: String
    var carModel: CarModel
}

struct Car: Identifiable {
    var id = UUID()
    var info: String
    var carMake: CarMake
}

class CarDatabase: ObservableObject {
    @Published var cars: [Car]
    
    init() {
        let carDetail = CarDetail(info: "Heck of a car")
        let carYear = CarYear(info: "88", detail: carDetail)
        let carModel = CarModel(info: "Royale", carYear: carYear)
        let carMake = CarMake(info: "Oldsmobile", carModel: carModel)
        let car = Car(info: "My first car", carMake: carMake)
        cars = [car]
    }
}

@main
struct MyApp: App {
    @StateObject var database = CarDatabase()
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(database)
        }
    }
}

struct ContentView: View {
    @EnvironmentObject var database: CarDatabase
    
    var body: some View {
        NavigationStack { 
            List(database.cars) { car in 
                NavigationLink(car.info) { 
                    CarMakeView(carMake: car.carMake)
                }
            }
        }
    }
}

struct CarMakeView: View {
    let carMake: CarMake
    var body: some View {
        VStack {
            NavigationLink(carMake.info) {
                CarModelView(carModel: carMake.carModel)
            }
        }
    }
}

struct CarModelView: View {
    let carModel: CarModel
    
    var body: some View {
        VStack {
            NavigationLink(carModel.info) {
                CarYearView(carYear: carModel.carYear)
            }
        }
    }
}

struct CarYearView: View {
    let carYear: CarYear
    
    var body: some View {
        VStack {
            NavigationLink(carYear.info) {
                CarDetailView(carDetail: carYear.detail)
            }
        }
    }
}


struct CarDetailView: View {
    let carDetail: CarDetail
    
    var body: some View {
        VStack {
            Text(carDetail.info)
        }
    }
}