PickerExample.swift

//
//  ContentView.swift
//  PickerDemo2
//
//  Created by Ray Fix on 1/23/21.
//

import SwiftUI


struct Item {
  enum Status: CaseIterable {
    case noLongerCarry
    case onBackOrder
    case inStock

    static var gone: [Self] = [.noLongerCarry, .onBackOrder]

    var name: LocalizedStringKey {
      switch self {
      case .noLongerCarry:
        return "Don't carry"
      case .onBackOrder:
        return "Back order"
      case .inStock:
        return "In stock"
      }
    }
  }

  var name: String
  var status: Status
}

struct ItemView: View {
  @Binding var item: Item

  var body: some View {
    VStack {
      Text(item.name)
      Picker("Status", selection: $item.status) {
        ForEach(Item.Status.allCases, id: \.self) { status in
          Text(status.name).tag(status)
        }
      }.pickerStyle(SegmentedPickerStyle())
    }
  }
}

struct ReadOnlyItemView: View {
  let item: Item

  var body: some View {
    VStack {
      Text(item.name)
      Picker("Status", selection: .constant(item.status)) {
        ForEach(Item.Status.allCases, id: \.self) { status in
          Label(status.name, systemImage: "star").tag(status)
        }
      }.pickerStyle(SegmentedPickerStyle())
    }
  }
}

final class ItemsViewModel: ObservableObject {
  @Published var items: [Item]

  init(items: [Item]) {
    self.items = items
  }
}

struct ItemsView: View {
  @ObservedObject var viewModel: ItemsViewModel

  var body: some View {
    NavigationView {
      Form {
        ForEach(viewModel.items.indices, id: \.self) { index in
          ItemView(item: $viewModel.items[index])
        }
      }
    }
  }
}

struct ContentView: View {

  @StateObject var model = ItemsViewModel(items: [
    .init(name: "Power Rangers", status: .inStock),
    .init(name: "Legos", status: .noLongerCarry),
    .init(name: "Slinky", status: .onBackOrder)
  ])

  var body: some View {
    ItemsView(viewModel: model)
  }
}

struct ContentView_Previews: PreviewProvider {
  static var previews: some View {
    ContentView()
  }
}