How can I have multiple instance of a Class/Model in SwiftUI? - swiftui

Question

The first part of question is answered. Let's elaborate this example to:
TextField view:
struct CreateNewCard: View {
#ObservedObject var viewModel: CreateNewCardViewModel
var body: some View {
TextField("placeholder...", text: $viewModel.definition)
.foregroundColor(.black)
}
}
ViewModel:
class CreateNewCardViewModel: ObservableObject {
#Published var id: Int
#Published var definition: String = ""
}
Main View:
struct MainView: View {
#State var showNew = false
var body: some View {
ForEach(0...10, id: \.self) { index in // <<<---- this represents the id
Button(action: { showNew = true }, label: { Text("Create") })
.sheet(isPresented: $showNew, content: {
// now I have to pass the id, but this
// leads to that I create a new viewModel every time, right?
CreateNewCard(viewModel: CreateNewCardViewModel(id: index))
})
}
}
My problem is now that when I type something into the TextField and press the return button on the keyboard the text is removed.

Answer 1

This is the most strange way of coding that i seen, how ever I managed to make it work:
I would like say that you can use it as leaning and testing, but not good plan for real app, How ever it was interesting to me to make it working.
import SwiftUI
struct ContentView: View {
var body: some View {
MainView()
}
}
class CreateNewCardViewModel: ObservableObject, Identifiable, Equatable {
init(_ id: Int) {
self.id = id
}
#Published var id: Int
#Published var definition: String = ""
#Published var show = false
static func == (lhs: CreateNewCardViewModel, rhs: CreateNewCardViewModel) -> Bool {
return lhs.id == rhs.id
}
}
let arrayOfModel: [CreateNewCardViewModel] = [ CreateNewCardViewModel(0), CreateNewCardViewModel(1), CreateNewCardViewModel(2),
CreateNewCardViewModel(3), CreateNewCardViewModel(4), CreateNewCardViewModel(5),
CreateNewCardViewModel(6), CreateNewCardViewModel(7), CreateNewCardViewModel(8),
CreateNewCardViewModel(9) ]
struct ReadModelView: View {
#ObservedObject var viewModel: CreateNewCardViewModel
var body: some View {
TextField("placeholder...", text: $viewModel.definition)
.foregroundColor(.black)
}
}
struct MainView: View {
#State private var arrayOfModelState = arrayOfModel
#State private var showModel: Int?
#State private var isPresented: Bool = false
var body: some View {
VStack {
ForEach(Array(arrayOfModelState.enumerated()), id:\.element.id) { (index, item) in
Button(action: { showModel = index; isPresented = true }, label: { Text("Show Model " + item.id.description) }).padding()
}
if let unwrappedValue: Int = showModel {
Color.clear
.sheet(isPresented: $isPresented, content: { ReadModelView(viewModel: arrayOfModelState[unwrappedValue]) })
}
}
.padding()
}
}