gahntpo

NavigationLink(destination: FirstDetailView().environmentObject(self.nav), 
               isActive: self.$nav.detailIsShown) {
        Text("show me the details")
}

gahntpo

import SwiftUI

struct MainView: View {
    @EnvironmentObject var nav: NavigationController
    var body: some View {
        ZStack {
            if nav.hasSeenOnboarding {
                MainContentView()
            }else {
                OnboardingView()

gahntpo

import Foundation
import Combine

class NavigationController: ObservableObject  {
    
    @Published var hasSeenOnboarding: Bool
    var subscriptions = Set<AnyCancellable>()
    
    init() {
        //initilizing by looking up the value from UserDefaults

gahntpo

import Foundation
import Combine

class NavigationAuthController: ObservableObject {
    
    @Published var selection: Int = 1
    @Published var detailIsShown: Bool = false
    @Published var alertIsShown: Bool = false
    
    var subscriptions = Set<AnyCancellable>()

gahntpo

import SwiftUI

struct FirstDetailView: View {
    @EnvironmentObject var nav: NavigationController
    var body: some View {
        VStack {
            Text("Whaterever")
            Button(action: {
                self.nav.detailIsShown = false
            }) {

gahntpo

import SwiftUI

struct FirstDetailView: View {
    @EnvironmentObject var nav: NavigationController
    var body: some View {
        VStack {
        Text("show me the details")
            Button(action: {
                self.nav.selection = 1
            }) {

gahntpo

import SwiftUI

struct ContentView: View {
    
    @EnvironmentObject var nav: NavigationController
   
    var body: some View {
     // binding TabView selection to NavigationController
        TabView(selection: self.$nav.selection){
            FirstView()

gahntpo

import UIKit
import SwiftUI

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
      
      //add the NavigationController like so:

gahntpo

import Foundation

class NavigationController: ObservableObject  {
    @Published var selection: Int = 1
    @Published var detailIsShown: Bool = false
    @Published var alertIsShown: Bool = false
}

gahntpo

struct AlertExampleView: View {
    @State var showAlert: Bool = false
    var body: some View {
        VStack {
            Text("This is an example").font(.headline)
            Button(action: {
                self.showAlert = true
            }) {
                Text("show alert sheet")
            }