为什么图像没有变化？

我在Swift（纸牌游戏）中编写了自己的第一个应用程序，并陷入了第一步……让我先向您展示代码。我有一个结构-卡-一个对象-甲板：

import SwiftUI

struct Card {

    enum suit: String {
        case clubs = "♠"
        case diamonds = "♢"
        case hearts = "♡"
        case spades = "♣"
    }
    
    struct Rank {
        let name: String
        let power: Int
    }
    
    let suit: suit
    let rank: Rank
    let pic: Image
}

class Deck {
    
    private var allSuits: [Card.suit] = [.clubs,.diamonds,.hearts,.spades]

    private var allRanks = [
        Card.Rank(name: "6", power: -4),
        Card.Rank(name: "7", power: -3),
        Card.Rank(name: "8", power: -2),
        Card.Rank(name: "9", power: -1),
        Card.Rank(name: "10", power: 0),
        Card.Rank(name: "J", power: 1),
        Card.Rank(name: "Q", power: 2),
        Card.Rank(name: "K", power: 3),
        Card.Rank(name: "A", power: 4)]
    
    let allCards: [Card]
    var cardsInGame: [Card]
    
    init() {
        var allCards = [Card]()
        for suit in allSuits {
            for rank in allRanks {
                allCards.append(Card(suit: suit, rank: rank, pic: Image("\(rank.name)\(suit.rawValue)")))
            }
        }
        self.allCards = allCards
        self.cardsInGame = allCards
    }

    public func shuffle() {
        self.cardsInGame = self.cardsInGame.shuffled()
    }

    var cardsLeftInDeck: Int {
        get {
            return cardsInGame.count
        }
    }
}

好像Deck在卡名称和那里的图片之间具有正确的链接。然后是ContentView.swift中非常简单的代码：

import SwiftUI

struct ContentView: View {
    
    var deck = Deck()
    
    var body: some View {
        
        VStack {
            Button("Shuffle cards", action: {
                deck.shuffle()
            })
            deck.cardsInGame[0].pic
        }
    }
}

因此，当我按下按钮时，卡座会随机播放，但显示的图像没有任何变化deck.cardsInGame[0].pic-保持不变。我在那里可能错过了什么问题？可能只是对我在当前的结构和类设置中可能做错了什么（目前为止对我了解不多）给出一些总体看法？