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0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/ContentView.swift

@@ -0,0 +1,46 @@
+import SwiftUI
+
+enum Tab {
+  case one, inventory, three
+}
+
+class AppViewModel: ObservableObject {
+  @Published var inventoryViewModel: InventoryViewModel
+  @Published var selectedTab: Tab
+
+  init(
+    inventoryViewModel: InventoryViewModel = .init(),
+    selectedTab: Tab = .one
+  ) {
+    self.inventoryViewModel = inventoryViewModel
+    self.selectedTab = selectedTab
+  }
+}
+
+struct ContentView: View {
+  @ObservedObject var viewModel: AppViewModel
+
+  var body: some View {
+    TabView(selection: self.$viewModel.selectedTab) {
+      Button("Go to 2nd tab") {
+        self.viewModel.selectedTab = .inventory
+      }
+        .tabItem { Text("One") }
+        .tag(Tab.one)
+
+      InventoryView(viewModel: self.viewModel.inventoryViewModel)
+        .tabItem { Text("Inventory") }
+        .tag(Tab.inventory)
+
+      Text("Three")
+        .tabItem { Text("Three") }
+        .tag(Tab.three)
+    }
+  }
+}
+
+struct ContentView_Previews: PreviewProvider {
+  static var previews: some View {
+    ContentView(viewModel: .init(selectedTab: .inventory))
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/Inventory.swift

@@ -0,0 +1,153 @@
+import IdentifiedCollections
+import SwiftUI
+
+struct Item: Equatable, Identifiable {
+  let id = UUID()
+  var name: String
+  var color: Color?
+  var status: Status
+//  var quantity: Int
+//  var isOnBackOrder: Bool
+
+  enum Status: Equatable {
+    case inStock(quantity: Int)
+    case outOfStock(isOnBackOrder: Bool)
+
+    var isInStock: Bool {
+      guard case .inStock = self else { return false }
+      return true
+    }
+  }
+
+  struct Color: Equatable, Hashable {
+    var name: String
+    var red: CGFloat = 0
+    var green: CGFloat = 0
+    var blue: CGFloat = 0
+
+    static var defaults: [Self] = [
+      .red,
+      .green,
+      .blue,
+      .black,
+      .yellow,
+      .white,
+    ]
+
+    static let red = Self(name: "Red", red: 1)
+    static let green = Self(name: "Green", green: 1)
+    static let blue = Self(name: "Blue", blue: 1)
+    static let black = Self(name: "Black")
+    static let yellow = Self(name: "Yellow", red: 1, green: 1)
+    static let white = Self(name: "White", red: 1, green: 1, blue: 1)
+
+    var swiftUIColor: SwiftUI.Color {
+      .init(red: self.red, green: self.green, blue: self.blue)
+    }
+  }
+}
+
+class InventoryViewModel: ObservableObject {
+  @Published var inventory: IdentifiedArrayOf<Item>
+  @Published var itemToDelete: Item?
+
+  init(
+    inventory: IdentifiedArrayOf<Item> = [],
+    itemToDelete: Item? = nil
+  ) {
+    self.itemToDelete = itemToDelete
+    self.inventory = inventory
+  }
+
+  func delete(item: Item) {
+    withAnimation {
+      _ = self.inventory.remove(id: item.id)
+      //self.inventory.removeAll(where: { $0.id == item.id })
+    }
+  }
+
+  func deleteButtonTapped(item: Item) {
+    self.itemToDelete = item
+  }
+}
+
+struct InventoryView: View {
+  @ObservedObject var viewModel: InventoryViewModel
+//  @State var deleteItemAlertIsPresented = false
+//  @State var itemToDelete: Item?
+
+  var body: some View {
+    List {
+      ForEach(self.viewModel.inventory) { item in
+        HStack {
+          VStack(alignment: .leading) {
+            Text(item.name)
+
+            switch item.status {
+            case let .inStock(quantity):
+              Text("In stock: \(quantity)")
+            case let .outOfStock(isOnBackOrder):
+              Text("Out of stock" + (isOnBackOrder ? ": on back order" : ""))
+            }
+          }
+
+          Spacer()
+
+          if let color = item.color {
+            Rectangle()
+              .frame(width: 30, height: 30)
+              .foregroundColor(color.swiftUIColor)
+              .border(Color.black, width: 1)
+          }
+
+          Button(action: { self.viewModel.deleteButtonTapped(item: item) }) {
+            Image(systemName: "trash.fill")
+          }
+          .padding(.leading)
+        }
+        .buttonStyle(.plain)
+        .foregroundColor(item.status.isInStock ? nil : Color.gray)
+      }
+    }
+    .alert(
+      title: { Text($0.name) },
+      presenting: self.$viewModel.itemToDelete,
+      actions: { item in
+        Button("Delete", role: .destructive) {
+          self.viewModel.delete(item: item)
+        }
+      },
+      message: { _ in
+        Text("Are you sure you want to delete this item?")
+      }
+    )
+//    .alert(item: self.$viewModel.itemToDelete) { item in
+//      Alert(
+//        title: Text(item.name),
+//        message: Text("Are you sure you want to delete this item?"),
+//        primaryButton: .destructive(Text("Delete")) {
+//          self.viewModel.delete(item: item)
+//        },
+//        secondaryButton: .cancel()
+//      )
+//    }
+  }
+}
+
+struct InventoryView_Previews: PreviewProvider {
+  static var previews: some View {
+    let keyboard = Item(name: "Keyboard", color: .blue, status: .inStock(quantity: 100))
+
+    InventoryView(
+      viewModel: .init(
+        inventory: [
+          keyboard,
+          Item(name: "Charger", color: .yellow, status: .inStock(quantity: 20)),
+          Item(name: "Phone", color: .green, status: .outOfStock(isOnBackOrder: true)),
+          Item(name: "Headphones", color: .green, status: .outOfStock(isOnBackOrder: false)),
+        ],
+        itemToDelete: keyboard
+      )
+    )
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/Preview Content/Preview Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

0161-navigation-pt2/SwiftUINavigation/SwiftUINavigation/SwiftUIHelpers.swift

@@ -0,0 +1,49 @@
+import SwiftUI
+
+extension Binding {
+  func isPresent<Wrapped>() -> Binding<Bool>
+  where Value == Wrapped? {
+    .init(
+      get: { self.wrappedValue != nil },
+      set: { isPresented in
+        if !isPresented {
+          self.wrappedValue = nil
+        }
+      }
+    )
+  }
+}
+
+extension View {
+  func alert<A: View, M: View, T>(
+    title: (T) -> Text,
+    presenting data: Binding<T?>,
+    @ViewBuilder actions: @escaping (T) -> A,
+    @ViewBuilder message: @escaping (T) -> M
+  ) -> some View {
+    self.alert(
+      data.wrappedValue.map(title) ?? Text(""),
+      isPresented: data.isPresent(),
+      presenting: data.wrappedValue,
+      actions: actions,
+      message: message
+    )
+  }
+
+  func confirmationDialog<A: View, M: View, T>(
+    title: (T) -> Text,
+    titleVisibility: Visibility = .automatic,
+    presenting data: Binding<T?>,
+    @ViewBuilder actions: @escaping (T) -> A,
+    @ViewBuilder message: @escaping (T) -> M
+  ) -> some View {
+    self.confirmationDialog(
+      data.wrappedValue.map(title) ?? Text(""),
+      isPresented: data.isPresent(),
+      titleVisibility: titleVisibility,
+      presenting: data.wrappedValue,
+      actions: actions,
+      message: message
+    )
+  }
+}