How to get value on original object with EnvironmentObject in swiftUI - ios

Question

class GameSettings: ObservableObject {
#Published var score = 0
#Published var score1:Int? = 0
}
struct ScoreView: View {
#EnvironmentObject var settings: GameSettings
var body: some View {
NavigationView {
NavigationLink(destination: ContentView3()) {
Text("Score: \(settings.score)")
}
}
}
}
struct ContentView3: View {
#StateObject var settings = GameSettings()
#EnvironmentObject var settings111: GameSettings
var body: some View {
NavigationView {
VStack {
// A button that writes to the environment settings
Text("Current Score--->\(settings.score))")
Text(settings111.score1 == nil ? "nil" : "\(settings111.score1!)")
Button("Increase Score") {
settings.score += 1
}
NavigationLink(destination: ScoreView()) {
Text("Show Detail View")
}
}
.frame(height: 200)
}
.environmentObject(settings)
}
}
So here When user has performed some changes in ContentView3 & from navigation route if user lands to same screen i.e. ContentView3 so how can I get GameSettings object latest value on it ? I tried creating #EnvironmentObject var settings111: GameSettings but crashes.

Answer 1

Did you add .environmentObject() to your YourApp.swift as well?
If not, you have to add it like this
Life Cycle: SwiftUI
#main
struct YourApp: App {
var settings: GameSettings = GameSettings()
var body: some Scene {
WindowGroup {
ContentView()
.environmentObject(settings)
}
}
}
Life Cycle: UIKit
In SceneDelegate.swift
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
// Create the SwiftUI view that provides the window contents.
let contentView = ContentView()
var settings: GameSettings = GameSettings() // added line
// Use a UIHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: contentView.environmentObject(settings))) // added ".environmentObject(settings)" after contentView
self.window = window
window.makeKeyAndVisible()
}
}
Preview
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
.environmentObject(GameSettings())
}
}