Swift, значение не обновлено

в файле Maze.swift у меня есть:

var myMaze = Maze() // -> 9.0

определение структуры Maze со следующим содержимым:

@State var widthDouble = 9.0

и метод init()

init() {
print("Maze init:", self.widthDouble) }

В файле ContentView.swift у меня есть следующее:

@State var widthDouble = myMaze.widthDouble
Slider(value: $widthDouble, in: 3...33, step: 1) // updated to 16.0
Button(action: { action() }) { Text("Build maze with updated values") }

и, наконец, функция action()

func action() {
myMaze.widthDouble = widthDouble
print("ContentView: ", widthDouble) // -> 16.0
print("ContentView (myMaze.): ", myMaze.widthDouble) // -> 9.0
myMaze = .init() }

Хотя в func action() myMaze.widthDouble присваивается значение widthDouble (16.0), значение myMaze.widthDouble не обновляется и по-прежнему равно 9.0!

Вывод инициализации(): Инициализация лабиринта: 9.0

Значение 9.0 обновлено до 16.0 в ползунке.

Вывод действия(): КонтентВью: 16.0 ContentView (мой лабиринт): 9.0

Вывод инициализации(): Инициализация лабиринта: 9.0

Может кто-нибудь сказать мне, что не так и почему myMaze.widthDouble не обновляется?

Файл ContentView.swift

//
//  ContentView.swift
//  Maze
//
//  Created by Philippe Lagarrigue on 24/12/2020.
//

import SwiftUI

struct ContentView: View {
    @State private var selectedTab = 0
    
    let numTabs = 2
    let minDragTranslationForSwipe: CGFloat = 50
    
    var body: some View {
        TabView(selection: $selectedTab){
            NavigationView{
                MenuView()
                .navigationBarTitle("Settings")
            }
            .tabItem {
                Image("map")
                Text("Map")
            }.tag(0)
             .highPriorityGesture(DragGesture().onEnded({
                 self.handleSwipe(translation: $0.translation.width)
             }))
            NavigationView{
                MenuView()
                .navigationBarTitle("Settings")
            }
            .tabItem {
                Image("navigation")
                Text("Navigation")
            }.tag(1)
             .highPriorityGesture(DragGesture().onEnded({
                 self.handleSwipe(translation: $0.translation.width)
             }))
        }
    }
    
    private func handleSwipe(translation: CGFloat) {
        if translation > minDragTranslationForSwipe && selectedTab > 0 {
            selectedTab -= 1
        } else  if translation < -minDragTranslationForSwipe && selectedTab < numTabs-1 {
            selectedTab += 1
        }
    }
}

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

struct MenuView : View {
    @State var widthDouble = myMaze.widthDouble
    @State var heightDouble = myMaze.heightDouble
    @State var oneWay = myMaze.oneWay
    @State private var isEditing1 = false
    @State private var isEditing2 = false
    //@Environment(\.presentationMode) var mode: Binding<PresentationMode>
    var body : some View {
        HStack(alignment: VerticalAlignment.top) {
            VStack(alignment: .leading) {
                Text("Number of rooms (horizontally): \(widthDouble, specifier: "%.0f")")
                    .foregroundColor(isEditing1 ? .red : .black)
                Slider(value: $widthDouble, in: 3...33, step: 1,
                       onEditingChanged: { editing in isEditing1 = editing })
                Divider()
                // format: "Angle: %.0f", angle
                Text("Number of rooms (vertically): \(heightDouble, specifier: "%.0f")")
                    .foregroundColor(isEditing2 ? .red : .black)
                Slider(value: $heightDouble, in: 3...33, step: 1,
                       onEditingChanged: { editing in isEditing2 = editing })
                Divider()
                Toggle("One way", isOn: $oneWay)
                Button(action: { action() }) { Text("Build maze with updated values") }
            } .padding()
        }
    }
    func action() {
        myMaze.widthDouble = widthDouble
        myMaze.heightDouble = heightDouble
        print("ContentView: ", widthDouble, heightDouble)
        print("ContentView (myMaze.): ", myMaze.widthDouble, myMaze.heightDouble)
        myMaze = .init()
    }
}

Файл Maze.swift

//
//  Maze.swift
//  NewMaze
//
//  Created by Philippe Lagarrigue on 23/12/2020.
//

import Foundation
import SwiftUI

let wall = (North: 1, East: 2, South: 4, West: 8) // 15 means all walls
let exit = (toNorth: 16, toEast: 32, toSouth: 64, toWest: 128) // 0 means no exit
var myMaze = Maze()

struct Room {
    var x: Int
    var y: Int
    var roomsToExit: Int
}

struct Maze {
    // Properties
    var width = 9
    var height = 12
    var widthDouble = 9.0
    var heightDouble = 12.0
    var oneWay = true
    var exitRoom = Room(x: 0, y: 0, roomsToExit: 0)
    var farestRoom = Room(x: 0, y: 0, roomsToExit: 0)
    var mazeData = [[Int]]()
    var numberOfRooms: Int { return self.width * self.height }
    
    // Methods
    init() {
        //print(self.widthDouble, self.heightDouble)
        self.width = Int(self.widthDouble)
        self.height = Int(self.heightDouble)
        mazeData = Array(repeating: Array(repeating: 15, count: height), count: width)
        print("Maze init:", self.width, "x", self.height)
    }
}