Add rows from button press (nested array) - ios

Question

I am trying to add rows to a view as the user presses the add button. There are two buttons. One which adds a card and one which adds an expense inside the card. Im confident I have the code working to add cards but when I try to add an Expense inside a card it adds expenses to every card that is shown. How can I make it so that when the user presses the add expense button only the expense rows are added to the one card.
I have two structs one for Card and one for Expense, that I am using to store data.
struct Card: Identifiable {
var id = UUID()
var title: String
var expenses: [Expense]
}
struct Expense: Identifiable {
var id = UUID()
var expenseType: String
var amount: Double = 0.0
}
ContentView()
struct ContentView: View {
#State private var cards = [Card]()
#State private var expense = [Expense]()
var title = ""
var expenseType = ""
var amount: Double = 0.0
var body: some View {
NavigationStack {
Form {
List {
Button("Add card") {
addCard()
}
ForEach($cards) { a in
Section {
TextField("Title", text: a.title)
Button("Add expense") {
addExpenses()
}
ForEach($expense) { b in
TextField("my expense", text: b.expensetype)
TextField("amount", value: b.amount, format: .number)
}
}
}
}
}
}
}
func addCard() {
cards.append(Card(title: title, expenses: expense))
}
func addExpenses() {
expense.append(Expense(expenseType: "", amount: 0.0))
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Any help would be really appreciated.....

Answer 1

It doesn't seem like you need the following line, because each card has an expense array, you should remove it.
#State private var expense = [Expense]()
Then move the addExpenses func inside struct Card
struct Card: Identifiable {
var id = UUID()
var title: String
var expenses: [Expense]
mutating func addExpenses() {
expenses.append(Expense(expenseType: "", amount: 0.0))
}
}
Then call
a.wrappedValue.addExpenses()
In the Button
Button("Add expense") {
a.wrappedValue.addExpenses()
}