wip

0288-modern-uikit-pt8/README.md

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+## [Point-Free](https://www.pointfree.co)
+
+> #### This directory contains code from Point-Free Episode: [Modern UIKit: Stack Navigation, Part 2](https://www.pointfree.co/episodes/ep288-modern-uikit-stack-navigation-part-2)
+>
+> We round out our stack navigation tools with support for an `@Environment`-like feature for holding onto the stack’s path, a `NavigationLink`-like feature for pushing features onto the stack from anywhere, and we’ll handle every corner case from deep-linking to user dismissal.

0289-modern-uikit-pt9/ModernUIKit/ModernUIKit.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>

0289-modern-uikit-pt9/ModernUIKit/ModernUIKit/AppFeature.swift

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+import Perception
+import SwiftUI
+
+@Perceptible
+class AppModel {
+  var path: [Path] 
+  init(path: [Path] = []) {
+    self.path = path
+  }
+
+  enum Path: Hashable {
+    case counter(CounterModel)
+    case settings(SettingsModel)
+  }
+}
+
+struct AppView: View {
+  @Perception.Bindable var model: AppModel
+
+  var body: some View {
+    WithPerceptionTracking {
+      NavigationStack(path: $model.path) {
+        Form {
+          Button("Counter") {
+            model.path.append(.counter(CounterModel()))
+          }
+          Button("Settings") {
+            model.path.append(.settings(SettingsModel()))
+          }
+
+          NavigationLink("Counter w/ value", value: AppModel.Path.counter(CounterModel()))
+        }
+        .navigationDestination(for: AppModel.Path.self) { path in
+          switch path {
+          case let .counter(model):
+            CounterView(model: model)
+          case let .settings(model):
+            SettingsView(model: model)
+          }
+        }
+      }
+    }
+  }
+}
+
+extension NavigationStackController where Data == [AppModel.Path] {
+  convenience init(model: AppModel) {
+    @UIBindable var model = model
+    self.init(path: $model.path) {
+      RootViewController()
+    } destination: { path in
+      switch path {
+      case let .counter(model):
+        CounterViewController(model: model)
+      case let .settings(model):
+        SettingsViewController(model: model)
+      }
+    }
+    if #available(iOS 17.0, *) {
+      self.traitOverrides.path = $model.path
+    } else {
+      // Fallback on earlier versions
+    }
+  }
+}
+
+private enum PathTrait: UITraitDefinition {
+  static var defaultValue: UIBinding<[AppModel.Path]> {
+    @UIBindable var model = AppModel()
+    return $model.path
+  }
+}
+
+extension UITraitCollection {
+  @available(iOS 17.0, *)
+  var path: UIBinding<[AppModel.Path]> {
+    self[PathTrait.self]
+  }
+}
+
+@available(iOS 17.0, *)
+extension UIMutableTraits {
+  fileprivate(set) var path: UIBinding<[AppModel.Path]> {
+    get { self[PathTrait.self] }
+    set { self[PathTrait.self] = newValue }
+  }
+}
+
+final class RootViewController: UIViewController {
+  override func viewDidLoad() {
+    super.viewDidLoad()
+
+    let counterButton = UIButton(type: .system, primaryAction: UIAction { [weak self] _ in
+      self?.navigationController?.push(value: AppModel.Path.counter(CounterModel()))
+    })
+    counterButton.setTitle("Counter", for: .normal)
+    let settingsButton = UIButton(type: .system, primaryAction: UIAction { [weak self] _ in
+      self?.navigationController?.push(value: AppModel.Path.settings(SettingsModel()))
+    })
+    settingsButton.setTitle("Settings", for: .normal)
+    let stack = UIStackView(arrangedSubviews: [
+      counterButton,
+      settingsButton,
+    ])
+    stack.axis = .vertical
+    stack.translatesAutoresizingMaskIntoConstraints = false
+    view.addSubview(stack)
+
+    NSLayoutConstraint.activate([
+      stack.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+      stack.centerYAnchor.constraint(equalTo: view.centerYAnchor),
+    ])
+  }
+}

0289-modern-uikit-pt9/ModernUIKit/ModernUIKit/Assets.xcassets/AccentColor.colorset/Contents.json

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

0289-modern-uikit-pt9/ModernUIKit/ModernUIKit/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

0289-modern-uikit-pt9/ModernUIKit/ModernUIKit/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}