Add example code and builds for iOS apps and tests

.bazelrc

@@ -30,6 +30,10 @@ build:clang --host_cxxopt="-fno-exceptions"
 build:clang --cxxopt="-fvisibility=hidden"
 build:clang --host_cxxopt="-fvisibility=hidden"
 
+# iOS setup
+build:ios --ios_multi_cpus=sim_arm64
+build:ios --@rules_apple//apple/build_settings:ios_simulator_device="iPhone 16 Pro"
+
 # Platform-specific options for each supported platform.
 build:remote_linux_x64 --extra_execution_platforms=//platform/linux_x64
 build:remote_linux_x64 --host_platform=//platform/linux_x64
@@ -42,6 +46,9 @@ build:remote_macos_arm64 --platforms=//platform/macos_arm64
 build:remote_macos_arm64 --macos_minimum_os=14
 build:remote_macos_arm64 --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
 build:remote_macos_arm64 --host_action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+build:remote_macos_arm64 --xcode_version_config=//platform/macos_arm64:installed_xcodes
+# Disable workers: Builds fail with remote swift workers
+build:remote_macos_arm64 --experimental_remote_mark_tool_inputs=false
 
 build:remote_windows_x64 --host_platform=//platform/windows_x64
 build:remote_windows_x64 --platforms=//platform/windows_x64

MODULE.bazel

@@ -51,6 +51,7 @@ bazel_dep(name = "platforms", version = "1.1.0")
 bazel_dep(name = "protobuf", version = "35.0")
 bazel_dep(name = "apple_support", version = "2.6.1")
 bazel_dep(name = "rules_cc", version = "0.2.19")
+bazel_dep(name = "rules_apple", version = "5.0.0-rc2")
 bazel_dep(
     name = "googleapis",
     version = "0.0.0-20260525-ef19b7b7",

README.md

@@ -60,6 +60,13 @@ locally before attempting remote execution.
   bazel build //...
   ```
 
+- `ios`:
+
+  ```
+  # --config=ios is needed to properly set up the device simulators for testing
+  bazel build --config=ios //ios:all
+  ```
+
 - `swift`:
 
   ```sh
@@ -81,6 +88,14 @@ locally before attempting remote execution.
   bazel test //...
   ```
 
+- `ios`:
+
+  This will only work on a macOS device with XCode (and the necessary iPhone simulators) installed.
+
+  ```sh
+  bazel test --config=ios //ios:all
+  ```
+
 - `swift`:
 
   ```sh
@@ -141,6 +156,14 @@ isn't enabled in your `.bazelrc.user` file.
   bazel build //...
   ```
 
+- `ios`:
+
+  These can only be built remotely on a macOS worker with the matching XCode installed.
+
+  ```sh
+  bazel build --config=ios --config=remote_macos_arm64 --config=opal //ios:all
+  ```
+
 - `swift`:
 
   ```sh
@@ -161,6 +184,16 @@ isn't enabled in your `.bazelrc.user` file.
   bazel test //...
   ```
 
+- `ios`:
+
+  These can only be tested remotely on a macOS worker with the matching XCode installed.
+
+  **NOTE:** Currently, `ios_ui_test` on a remote cluster is not working due to a permissions mismatch).
+
+  ```sh
+  bazel test --config=ios --config=remote_macos_arm64 //ios:all
+  ```
+
 - `swift`:
 
   ```sh

infra/test-all.py

@@ -5,9 +5,11 @@
 import sys
 
 def main():
-    # All targets that can run in any environment.
+    # All targets that can run in any environment, except ios examples.
     targets = [
         "//...",
+        # TODO: Add testing configuration for ios tests.
+        "-//ios/...",
     ]
 
     for key in ("ARCH", "OPAL_RPC_CREDENTIALS", "OS", "REMOTE_EXECUTION"):

ios/BUILD.bazel

@@ -0,0 +1,50 @@
+load("@rules_apple//apple:ios.bzl", "ios_application", "ios_ui_test", "ios_unit_test")
+load("@rules_swift//swift:swift.bzl", "swift_library")
+
+swift_library(
+    name = "HelloAppLibrary",
+    srcs = ["HelloApp.swift"],
+    tags = ["manual"],
+)
+
+ios_application(
+    name = "HelloApp",
+    bundle_id = "com.engflow.helloapp",
+    families = [
+        "iphone",
+        "ipad",
+    ],
+    minimum_os_version = "26.0",
+    deps = [":HelloAppLibrary"],
+)
+
+swift_library(
+    name = "HelloTestLib",
+    testonly = True,
+    srcs = ["HelloTest.swift"],
+    tags = ["manual"],
+)
+
+ios_unit_test(
+    name = "HelloTest",
+    minimum_os_version = "26.0",
+    deps = [":HelloTestLib"],
+)
+
+swift_library(
+    name = "HelloAppUITestLib",
+    testonly = True,
+    srcs = [
+        "HelloAppUITest.swift",
+    ],
+    module_name = "HelloAppUITest",
+    tags = ["manual"],
+)
+
+ios_ui_test(
+    name = "HelloAppUITest",
+    minimum_os_version = "26.0",
+    runner = "@rules_apple//apple/testing/default_runner:ios_xctestrun_ordered_runner",
+    test_host = ":HelloApp",
+    deps = [":HelloAppUITestLib"],
+)

ios/HelloApp.swift

@@ -0,0 +1,23 @@
+import SwiftUI
+
+@main
+struct HelloApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}
+
+struct ContentView: View {
+    var body: some View {
+        VStack {
+            Image(systemName: "globe")
+                .imageScale(.large)
+                .foregroundStyle(.tint)
+            Text("Hello, world!")
+                .accessibility(identifier: "HELLO_WORLD")
+        }
+        .padding()
+    }
+}

ios/HelloAppUITest.swift

@@ -0,0 +1,22 @@
+import XCTest
+
+class HelloAppUITest: XCTestCase {
+    var application: XCUIApplication!
+
+    override func setUp() {
+        super.setUp()
+        continueAfterFailure = false
+        application = .init()
+        application.launch()
+    }
+
+    override func tearDown() {
+        application.terminate()
+        application = nil
+    }
+
+    func testIsActive() {
+        XCTAssertTrue(application.staticTexts["HELLO_WORLD"].exists)
+    }
+}
+

ios/HelloTest.swift

@@ -0,0 +1,10 @@
+import Testing
+
+@Suite
+struct HelloTest {
+    @Test
+    func example() {
+        print("Hello from HelloTest")
+        #expect(1 + 1 == 2)
+    }
+}

platform/macos_arm64/BUILD

@@ -1,5 +1,10 @@
+load("@apple_support//xcode:available_xcodes.bzl", "available_xcodes")
+load("@apple_support//xcode:xcode_config.bzl", "xcode_config")
+load("@apple_support//xcode:xcode_version.bzl", "xcode_version")
+
 package(default_visibility = ["//visibility:public"])
 
+# The platform definition for a remote mac worker.
 platform(
     name = "macos_arm64",
     constraint_values = [
@@ -10,3 +15,38 @@ platform(
         "Pool": "macos_arm_m2",
     },
 )
+
+# The XCode installed on the remote worker.
+xcode_version(
+    name = "version26_5_0_17F42",
+    aliases = [
+        "26.5.0",
+        "26.5",
+        "17F42",
+        "26.5.0.17F42",
+        "26",
+    ],
+    default_ios_sdk_version = "26.5",
+    default_macos_sdk_version = "26.5",
+    default_tvos_sdk_version = "26.5",
+    default_visionos_sdk_version = "26.5",
+    default_watchos_sdk_version = "26.5",
+    version = "26.5.0.17F42",
+)
+
+xcode_config(
+    name = "installed_xcodes",
+    default = ":version26_5_0_17F42",
+    versions = [
+        ":version26_5_0_17F42",
+    ],
+)
+
+available_xcodes(
+    name = "available_xcodes",
+    default = ":version26_5_0_17F42",
+    versions = [
+        ":version26_5_0_17F42",
+    ],
+)
+