Add source code for appendix C

19-appendix-c-uikit/.gitignore

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+#### joe made this: https://goel.io/joe
+
+#####=== Swift ===#####
+
+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
+#
+# Pods/
+

19-appendix-c-uikit/Albertos.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?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>

19-appendix-c-uikit/Albertos.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

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+{
+  "object": {
+    "pins": [
+      {
+        "package": "CwlCatchException",
+        "repositoryURL": "https://github.com/mattgallagher/CwlCatchException.git",
+        "state": {
+          "branch": null,
+          "revision": "682841464136f8c66e04afe5dbd01ab51a3a56f2",
+          "version": "2.1.0"
+        }
+      },
+      {
+        "package": "CwlPreconditionTesting",
+        "repositoryURL": "https://github.com/mattgallagher/CwlPreconditionTesting.git",
+        "state": {
+          "branch": null,
+          "revision": "02b7a39a99c4da27abe03cab2053a9034379639f",
+          "version": "2.0.0"
+        }
+      },
+      {
+        "package": "Nimble",
+        "repositoryURL": "http://github.com/Quick/Nimble.git",
+        "state": {
+          "branch": null,
+          "revision": "af1730dde4e6c0d45bf01b99f8a41713ce536790",
+          "version": "9.2.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

19-appendix-c-uikit/Albertos.xcodeproj/xcshareddata/xcschemes/Albertos.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1230"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3FC9D8AC2562389E00BF115D"
+               BuildableName = "Albertos.app"
+               BlueprintName = "Albertos"
+               ReferencedContainer = "container:Albertos.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES"
+      onlyGenerateCoverageForSpecifiedTargets = "YES">
+      <CodeCoverageTargets>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "3FC9D8AC2562389E00BF115D"
+            BuildableName = "Albertos.app"
+            BlueprintName = "Albertos"
+            ReferencedContainer = "container:TheItalianRestaurant.xcodeproj">
+         </BuildableReference>
+      </CodeCoverageTargets>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3FC9D8BD2562389F00BF115D"
+               BuildableName = "AlbertosTests.xctest"
+               BlueprintName = "AlbertosTests"
+               ReferencedContainer = "container:Albertos.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+         <TestableReference
+            skipped = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "3FC9D8C8256238A000BF115D"
+               BuildableName = "AlbertosUITests.xctest"
+               BlueprintName = "AlbertosUITests"
+               ReferencedContainer = "container:Albertos.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "3FC9D8AC2562389E00BF115D"
+            BuildableName = "Albertos.app"
+            BlueprintName = "Albertos"
+            ReferencedContainer = "container:Albertos.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "3FC9D8AC2562389E00BF115D"
+            BuildableName = "Albertos.app"
+            BlueprintName = "Albertos"
+            ReferencedContainer = "container:Albertos.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

19-appendix-c-uikit/Albertos/AlertViewModel.swift

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+struct AlertViewModel {
+
+    let title: String
+    let message: String
+    let buttonText: String
+    let buttonAction: (() -> Void)?
+}

19-appendix-c-uikit/Albertos/AppCoordinator.swift

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+import Combine
+import UIKit
+
+class AppCoordinator: MenuListViewControllerNavigationDelegate, OrderDetailViewControllerDelegate {
+
+    let navigationController: UINavigationController
+    private let orderController: OrderController
+    private let paymentProcessing: PaymentProcessing
+
+    private lazy var menuListViewController: MenuListViewController = {
+        let viewController = MenuListViewController(menuFetching: MenuFetcher())
+        viewController.navigationDelegate = self
+        return viewController
+    }()
+
+    private let orderButton: UIButton
+
+    private lazy var orderButtonViewModel = OrderButtonViewModel(orderController: orderController)
+
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        orderController: OrderController,
+        paymentProcessing: PaymentProcessing,
+        navigationController: UINavigationController = UINavigationController()
+    ) {
+        self.navigationController = navigationController
+        self.orderController = orderController
+        self.paymentProcessing = paymentProcessing
+
+        orderButton = BigButton() // a `UIButton` subclass that configures the button style
+
+        orderButtonViewModel.$text
+            .sink { [weak self] text in
+                guard let button = self?.orderButton else { return }
+                button.setTitle(text, for: .normal)
+            }
+            .store(in: &cancellables)
+
+        orderButton.addAction(
+            UIAction(handler: { [weak self] _ in self?.presentOrderDetail()}),
+            for: .primaryActionTriggered
+        )
+    }
+
+    func loadFirstScreen() {
+        navigationController.viewControllers = [menuListViewController]
+
+        navigationController.view.addSubview(orderButton)
+
+        orderButton.pin(.centerX, to: navigationController.view)
+        orderButton.alignSafeAreaBottomAnchor(to: navigationController.view)
+    }
+
+    func orderDetailViewControllerCompletedPaymentFlow(_ viewController: OrderDetailViewController) {
+        navigationController.dismiss(animated: true, completion: .none)
+    }
+
+    func menuListViewController(
+        _ viewController: MenuListViewController,
+        didSelectItem item: MenuItem
+    ) {
+        navigationController.pushViewController(
+            MenuItemDetailViewController(
+                viewModel: .init(item: item, orderController: orderController)
+            ),
+            animated: true
+        )
+    }
+
+    func presentOrderDetail() {
+        let orderDetailViewController =  OrderDetailViewController(
+            orderController: orderController,
+            paymentProcessor: paymentProcessing
+        )
+        orderDetailViewController.delegate = self
+
+        navigationController.present(
+            UINavigationController(rootViewController: orderDetailViewController),
+            animated: true,
+            completion: .none
+        )
+    }
+}

19-appendix-c-uikit/Albertos/AppDelegate.swift

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+import UIKit
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        return true
+    }
+
+    // MARK: - UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+}

19-appendix-c-uikit/Albertos/Assets.xcassets/AccentColor.colorset/Contents.json

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