Add iOS frontend for test app (#1473)

.github/workflows/build.yaml

@@ -114,8 +114,7 @@ jobs:
           script: ./gradlew -p samples/counter connectedCheck
 
       - name: Build Counter iOS (UIKit)
-        run: |
-          xcodebuild -project samples/counter/ios-uikit/CounterApp.xcodeproj -scheme CounterApp -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest'
+        run: xcodebuild -project samples/counter/ios-uikit/CounterApp.xcodeproj -scheme CounterApp -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest'
 
   sample-emoji:
     runs-on: macos-latest
@@ -134,8 +133,7 @@ jobs:
       - run: ./gradlew -p samples/emoji-search build
 
       - name: Build Emoji Search iOS (UIKit)
-        run: |
-          xcodebuild -project samples/emoji-search/ios-uikit/EmojiSearchApp.xcodeproj -scheme EmojiSearchApp -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest'
+        run: xcodebuild -project samples/emoji-search/ios-uikit/EmojiSearchApp.xcodeproj -scheme EmojiSearchApp -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest'
 
   test-app:
     runs-on: macos-latest
@@ -153,6 +151,9 @@ jobs:
 
       - run: ./gradlew -p test-app build
 
+      - name: Build TestApp iOS (UIKit)
+        run: xcodebuild -project test-app/ios-uikit/TestApp.xcodeproj -scheme TestApp -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest'
+
   publish:
     runs-on: macos-latest
     if: ${{ github.ref == 'refs/heads/trunk' && github.repository == 'cashapp/redwood' }}

settings.gradle

@@ -95,6 +95,7 @@ include ':test-app:schema:widget-protocol'
 if (!hasProperty('redwoodNoApps')) {
   include ':test-app:android-views'
   include ':test-app:browser'
+  include ':test-app:ios-shared'
   include ':test-app:launcher'
   include ':test-app:presenter'
   include ':test-app:presenter-treehouse'

test-app/ios-shared/build.gradle

@@ -0,0 +1,25 @@
+apply plugin: 'org.jetbrains.kotlin.multiplatform'
+
+kotlin {
+  [
+    iosArm64(),
+    iosX64(),
+    iosSimulatorArm64(),
+  ].each { iosTarget ->
+    iosTarget.binaries.framework {
+      baseName = 'TestAppKt'
+    }
+  }
+
+  sourceSets {
+    commonMain {
+      dependencies {
+        implementation projects.testApp.launcher
+        implementation projects.testApp.presenterTreehouse
+        implementation projects.testApp.schema.widgetProtocol
+        implementation projects.redwoodLayoutUiview
+        implementation projects.redwoodLazylayoutUiview
+      }
+    }
+  }
+}

test-app/ios-shared/src/commonMain/kotlin/com/example/redwood/testing/ios/TestAppLauncher.kt

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2023 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.redwood.testing.ios
+
+import app.cash.redwood.treehouse.EventListener
+import app.cash.redwood.treehouse.TreehouseApp
+import app.cash.redwood.treehouse.TreehouseAppFactory
+import app.cash.zipline.Zipline
+import app.cash.zipline.ZiplineManifest
+import app.cash.zipline.loader.ManifestVerifier.Companion.NO_SIGNATURE_CHECKS
+import app.cash.zipline.loader.asZiplineHttpClient
+import app.cash.zipline.loader.withDevelopmentServerPush
+import com.example.redwood.testing.launcher.TestAppSpec
+import com.example.redwood.testing.treehouse.HostApi
+import com.example.redwood.testing.treehouse.TestAppPresenter
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.flow.flowOf
+import platform.Foundation.NSLog
+import platform.Foundation.NSURLSession
+
+class TestAppLauncher(
+  private val nsurlSession: NSURLSession,
+  private val hostApi: HostApi,
+) {
+  private val coroutineScope: CoroutineScope = MainScope()
+  private val manifestUrl = "http://localhost:8080/manifest.zipline.json"
+
+  @Suppress("unused") // Invoked in Swift.
+  fun createTreehouseApp(): TreehouseApp<TestAppPresenter> {
+    val ziplineHttpClient = nsurlSession.asZiplineHttpClient()
+
+    val treehouseAppFactory = TreehouseAppFactory(
+      httpClient = ziplineHttpClient,
+      manifestVerifier = NO_SIGNATURE_CHECKS,
+      eventListener = object : EventListener() {
+        override fun codeLoadFailed(app: TreehouseApp<*>, manifestUrl: String?, exception: Exception, startValue: Any?) {
+          NSLog("Treehouse: codeLoadFailed: $exception")
+        }
+
+        override fun codeLoadSuccess(app: TreehouseApp<*>, manifestUrl: String?, manifest: ZiplineManifest, zipline: Zipline, startValue: Any?) {
+          NSLog("Treehouse: codeLoadSuccess")
+        }
+      },
+    )
+
+    val manifestUrlFlow = flowOf(manifestUrl)
+      .withDevelopmentServerPush(ziplineHttpClient)
+
+    val treehouseApp = treehouseAppFactory.create(
+      appScope = coroutineScope,
+      spec = TestAppSpec(
+        manifestUrl = manifestUrlFlow,
+        hostApi = hostApi,
+      ),
+    )
+
+    treehouseApp.start()
+
+    return treehouseApp
+  }
+}

test-app/ios-shared/src/commonMain/kotlin/com/example/redwood/testing/ios/exposed.kt

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2023 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@file:Suppress("unused", "UNUSED_PARAMETER")
+
+package com.example.redwood.testing.ios
+
+import app.cash.redwood.Modifier
+import app.cash.redwood.layout.uiview.UIViewRedwoodLayoutWidgetFactory
+import app.cash.redwood.lazylayout.uiview.UIViewRedwoodLazyLayoutWidgetFactory
+import app.cash.redwood.treehouse.AppService
+import app.cash.redwood.treehouse.Content
+import app.cash.redwood.treehouse.TreehouseUIView
+import app.cash.redwood.treehouse.TreehouseView
+import app.cash.redwood.treehouse.TreehouseView.WidgetSystem
+import app.cash.redwood.treehouse.bindWhenReady
+import com.example.redwood.testing.treehouse.TestAppPresenter
+import com.example.redwood.testing.widget.TestSchemaProtocolNodeFactory
+import com.example.redwood.testing.widget.TestSchemaWidgetFactories
+import com.example.redwood.testing.widget.TestSchemaWidgetFactory
+import okio.ByteString
+import okio.ByteString.Companion.toByteString
+import okio.Closeable
+import platform.Foundation.NSData
+
+// Used to export types to Objective-C / Swift.
+fun exposedTypes(
+  testAppPresenter: TestAppPresenter,
+  testAppLauncher: TestAppLauncher,
+  testSchemaWidgetFactory: TestSchemaWidgetFactory<*>,
+  protocolNodeFactory: TestSchemaProtocolNodeFactory<*>,
+  treehouseUIView: TreehouseUIView,
+  uiViewRedwoodLayoutWidgetFactory: UIViewRedwoodLayoutWidgetFactory,
+  uiViewRedwoodLazyLayoutWidgetFactory: UIViewRedwoodLazyLayoutWidgetFactory,
+  widgetSystem: WidgetSystem<*>,
+  widgetFactories: TestSchemaWidgetFactories<*>,
+) {
+  throw AssertionError()
+}
+
+fun byteStringOf(data: NSData): ByteString = data.toByteString()
+
+fun modifier(): Modifier = Modifier
+
+fun <A : AppService> bindWhenReady(
+  content: Content,
+  view: TreehouseView<*>,
+): Closeable = content.bindWhenReady(view)