在我的项目中，用户可以有两个最喜欢的产品。他们可以通过点击其中一个（ProductView）来更改它们。点击一个后，将显示一个名为“ProductSheet”的视图。我尝试从上一个视图中携带id，但它不在那里。我需要将id传递到'ProductSheet'和'ProductRowView'中，以便执行更改最喜欢的产品的功能。
我不明白为什么product_id在'ProductSheet'和'ProductRowView'视图中没有值。下面是代码的简化版本：

struct FavouriteProducts: View {
    
    @StateObject var favouriteProductsModel = FavouriteProductsViewModel()
    @State private var showingSheet = false
    @State var selectedProduct: String?
    @State var product_id: String?
        
    
    var body: some View {
        
        ZStack {
            let defaults = UserDefaults.standard
            let keyString: String? = defaults.string(forKey: "key") ?? ""
            
            VStack {
                
                HStack {
                    
                    Text("Tap to change favourite product")
                }
                
                HStack(spacing: 25) {
                    
                    ForEach(favouriteProductsModel.favourite_products, id: \.id){ product in
                        
                        VStack {
                                                                                                                
                            Image("ProductImage")
                                .resizable()
                                                    
                            Text(String(product.product_name ?? ""))

                        }
                        .onTapGesture {
                            selectedProduct = product.id
                            self.product_id = product.id ?? ""
                            self.showingSheet = true
//selectedProduct does have a value in this print statement
                            print("Tapped Product ID: \(String(describing: selectedProduct))")
                        }
                        .sheet(item: $selectedProduct) {
                            favouriteProductsModel.fetchFavouriteProducts(key: keyString ?? "")
                        } content: { item in
                            ProductSheet(product_id: selectedProduct ?? "")
                        }
                    }
                }
            }
        }
        .onLoad {
            let defaults = UserDefaults.standard
            let keyString: String? = defaults.string(forKey: "key") ?? ""
            self.favouriteProductsModel.fetchFavouriteProducts(key: keyString ?? "")
        }
    }
}

struct ProductSheet: View {
    
    @StateObject var marketplaceModel = MarketplaceViewModel()
    @State var product_id: String?

    var body: some View {

        VStack {
            
            // The product_id here is not being displayed, because the variable has no value
            Text(product_id ?? "")
            
            ForEach(marketplaceModel.filteredProduct, id:\.self){ product in
                
                ProductRowView(productData: product, product_id: product_id ?? "")
            }
                        
        }
    }
}

struct ProductRowView: View {
    
    @Environment(\.dismiss) var dismiss
    @StateObject var favouriteProductsModel = FavouriteProductsViewModel()
    @State private var isShowingDetailView = false
    @State var selectedProduct : ProductTile?
    @State var new_id = ""
    var productData: ProductRow
    var product_id: String
    
    var body: some View {
        
        VStack {
            
            HStack {
                Text(productData.title)
                
                HStack {
                    NavigationLink("", isActive: $isShowingDetailView) {
                        ProductSeeAllView(productData: productData, product_id: productData.id)
                    }.navigationTitle("")
                    
                    Button("See All") {
                        isShowingDetailView = true
                    }
                    Image(systemName: "chevron.right")
                }
            }
            
            HStack {
                ScrollView {
                    HStack {
                        ForEach(productData.products ?? []) { product in
                            ProductView(productData: product)
                                .onTapGesture {
                                    new_id = product.id ?? ""
                                    selectedProduct = product
                                    print("Product id: \(selectedProduct?.id ?? "")")
                                    let defaults = UserDefaults.standard
                                    let keyString: String? = defaults.string(forKey: "key") ?? ""
                                    
                                    favouriteProductsModel.changeFavouriteProducts(key: keyString ?? "", current_id: product_id, new_id: new_id ) { (success) in
                                        if success {
                                            dismiss()
                                        } else {
                                            print("Unsuccessful...")
                                        }
                                    }
                                }
                        }
                    }
                }
            }
        }
    }
}

当初始化'ProductSheet'和'ProductRowView'时，我应该传递product_id，但它不起作用。为什么会这样？
编辑：通过进一步的测试，如果第二次初始化工作表，似乎会通过id。它似乎从来没有工作第一次。