Journeys-Config.swift

struct ContentView: View {
    @State var loginPresented = false
    @State var activeSheet: ActiveSheet?
    @State var loginConfig = LoginView.Configuration()
    
    enum ActiveSheet {
        case home, dashboard
    }
    
    var body: some View {
        prepareLogin()
            .sheet(isPresented: $loginPresented) {
                if let sheet = activeSheet {
                    switch sheet {
                    case .home:
                        HomeView(config: loginConfig)
                    case .dashboard:
                        Text("Dashboard")
                    }
                }
            }
    }
    
    func prepareLogin() -> some  View {
        
        DispatchQueue.main.async {
            loginConfig.router.onLogin = {
                activeSheet = .home
                loginPresented.toggle()
            }
            
            loginConfig.router.gotoHome = {
                activeSheet = .dashboard
                loginPresented = true
            }
            
            loginConfig.design.strings.loginTitle = "Signin"
        }
        let veiw = LoginView(config: loginConfig)
        return veiw
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}


struct LoginView: View {
    var config: Configuration
    
    var body: some View {
        VStack(alignment: .center, spacing: 32){
            Button(config.design.strings.loginTitle) {
                config.router.onLogin?()
            }
        }
    }
}


extension LoginView {
    struct Configuration {
        var router = Router()
        var design = Design()
        
        struct Router {
            var onLogin: (() -> (Void))?
            var gotoHome: (() -> (Void))?
        }
        
        struct Design {
            var strings = Strings()
            
            struct Strings {
                var loginTitle = "Login"
            }
        }
    }
}


struct HomeView: View {
    let config: LoginView.Configuration
    
    var body: some View {
        VStack {
            Text("Hello, HomeView!")
                .padding()
            
            Button("Goto Home ") {
                config.router.gotoHome?()
            }
        }
    }
}