154

0154-refreshable-pt2/CaseStudies/CaseStudies.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>

0154-refreshable-pt2/CaseStudies/CaseStudies.xcodeproj/xcshareddata/xcschemes/CaseStudies (SwiftUI).xcscheme

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1240"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DC89C41224460F95006900B9"
+               BuildableName = "SwiftUICaseStudies.app"
+               BlueprintName = "SwiftUICaseStudies"
+               ReferencedContainer = "container:CaseStudies.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DC89C42824460F96006900B9"
+               BuildableName = "SwiftUICaseStudiesTests.xctest"
+               BlueprintName = "SwiftUICaseStudiesTests"
+               ReferencedContainer = "container:CaseStudies.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 = "DC89C41224460F95006900B9"
+            BuildableName = "SwiftUICaseStudies.app"
+            BlueprintName = "SwiftUICaseStudies"
+            ReferencedContainer = "container:CaseStudies.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DC89C41224460F95006900B9"
+            BuildableName = "SwiftUICaseStudies.app"
+            BlueprintName = "SwiftUICaseStudies"
+            ReferencedContainer = "container:CaseStudies.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

0154-refreshable-pt2/CaseStudies/SwiftUICaseStudies/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,99 @@
+{
+  "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"
+    },
+    {
+      "filename" : "AppIcon.png",
+      "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
+  }
+}

0154-refreshable-pt2/CaseStudies/SwiftUICaseStudies/Assets.xcassets/Contents.json

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

0154-refreshable-pt2/CaseStudies/SwiftUICaseStudies/ComposableRefreshable.swift

@@ -0,0 +1,128 @@
+import Combine
+import ComposableArchitecture
+import SwiftUI
+
+struct PullToRefreshState: Equatable {
+  var count = 0
+  var fact: String?
+  var isLoading = false
+}
+
+enum PullToRefreshAction: Equatable {
+  case cancelButtonTapped
+  case factResponse(Result<String, FactClient.Error>)
+  case decrementButtonTapped
+  case incrementButtonTapped
+  case refresh
+}
+
+struct PullToRefreshEnvironment {
+  var fact: FactClient
+  var mainQueue: AnySchedulerOf<DispatchQueue>
+}
+
+let pullToRefreshReducer = Reducer<
+  PullToRefreshState,
+  PullToRefreshAction,
+  PullToRefreshEnvironment
+> { state, action, environment in
+
+  struct CancelId: Hashable {}
+
+  switch action {
+  case .cancelButtonTapped:
+    state.isLoading = false
+    return .cancel(id: CancelId())
+
+  case let .factResponse(.success(fact)):
+    state.isLoading = false
+    state.fact = fact
+    return .none
+
+  case .factResponse(.failure):
+    state.isLoading = false
+    // TODO: do some error handling
+    return .none
+
+  case .decrementButtonTapped:
+    state.count -= 1
+    return .none
+
+  case .incrementButtonTapped:
+    state.count += 1
+    return .none
+
+  case .refresh:
+    state.fact = nil
+    state.isLoading = true
+    return environment.fact.fetch(state.count)
+//      .receive(on: environment.mainQueue)
+      .delay(for: 2, scheduler: environment.mainQueue.animation())
+      .catchToEffect()
+      .map(PullToRefreshAction.factResponse)
+      .cancellable(id: CancelId())
+  }
+}
+
+struct PullToRefreshView: View {
+  let store: Store<PullToRefreshState, PullToRefreshAction>
+
+  var body: some View {
+    WithViewStore(self.store) { viewStore in
+      List {
+        HStack {
+          Button("-") { viewStore.send(.decrementButtonTapped) }
+          Text("\(viewStore.count)")
+          Button("+") { viewStore.send(.incrementButtonTapped) }
+        }
+        .buttonStyle(.plain)
+
+        if let fact = viewStore.fact {
+          Text(fact)
+        }
+        if viewStore.isLoading {
+          Button("Cancel") {
+            viewStore.send(.cancelButtonTapped, animation: .default)
+          }
+        }
+      }
+      .refreshable {
+        await viewStore.send(.refresh, while: \.isLoading)
+      }
+    }
+  }
+}
+
+extension ViewStore {
+  func send(
+    _ action: Action,
+    while predicate: @escaping (State) -> Bool
+  ) async {
+    self.send(action)
+    await withUnsafeContinuation { (continuation: UnsafeContinuation<Void, Never>) in
+      var cancellable: Cancellable?
+      cancellable = self.publisher
+        .filter { !predicate($0) }
+        .prefix(1)
+        .sink { _ in
+          continuation.resume()
+          _ = cancellable
+        }
+    }
+  }
+}
+
+struct PullToRefresh_Previews: PreviewProvider {
+  static var previews: some View {
+    PullToRefreshView(
+      store: .init(
+        initialState: .init(),
+        reducer: pullToRefreshReducer,
+        environment: PullToRefreshEnvironment(
+          fact: .live,
+          mainQueue: .main
+        )
+      )
+    )
+  }
+}

0154-refreshable-pt2/CaseStudies/SwiftUICaseStudies/FactClient.swift

@@ -0,0 +1,42 @@
+import Combine
+import ComposableArchitecture
+import XCTestDynamicOverlay
+
+struct FactClient {
+  var fetch: (Int) -> Effect<String, Error>
+
+  struct Error: Swift.Error, Equatable {}
+}
+
+extension FactClient {
+  // This is the "live" fact dependency that reaches into the outside world to fetch trivia.
+  // Typically this live implementation of the dependency would live in its own module so that the
+  // main feature doesn't need to compile it.
+  static let live = Self(
+    fetch: { number in
+      URLSession.shared.dataTaskPublisher(
+        for: URL(string: "http://numbersapi.com/\(number)/trivia")!
+      )
+      .map { data, _ in String(decoding: data, as: UTF8.self) }
+      .catch { _ in
+        // Sometimes numbersapi.com can be flakey, so if it ever fails we will just
+        // default to a mock response.
+        Just("\(number) is a good number Brent")
+          .delay(for: 1, scheduler: DispatchQueue.main)
+      }
+      .setFailureType(to: Error.self)
+      .eraseToEffect()
+    })
+}
+
+#if DEBUG
+  extension FactClient {
+    // This is the "failing" fact dependency that is useful to plug into tests that you want
+    // to prove do not need the dependency.
+    static let failing = Self(
+      fetch: { _ in
+        XCTFail("\(Self.self).fact is unimplemented.")
+        return .none
+      })
+  }
+#endif