Thonyvb

struct MainView: View {
    @StateObject var prices = Prices()

    var body: some View {
            VStack {
                PricesView()
            }.environmentObject(prices)
    }
}

Thonyvb

struct CartView: View {
    @ObservedObject var prices: Prices
    // … 

Thonyvb

struct MainView: View {
    @StateObject var prices = Prices()
    // …

Thonyvb

class Prices: ObservableObject {
   @Published var prices: [Int]
   // ... obtain prices via API
}

Thonyvb

struct ProductView: View {
   @State private var isFavorite: Bool = false

   var body: some View {
	// ... 
     FavButton(isFavorite: $isFavorite) // Pass a binding.
   }
}

struct FavButton: View {

Thonyvb

struct BuyButton: View {
    @State private var isDisabled = true
    
    var body: some View {
        
        Button("Hacer la compra", action: {})
            .buttonStyle(.borderedProminent) // apple's default for demonstration purposes.
            .disabled(isDisabled)
    }
}