ci: Add Mac Catalyst build (#168)

* Build for Catalyst

* Always use Mac 14

* Only build Catalyst on ARM

Author: bbrk24

.github/workflows/build-test-and-docs.yml

@@ -126,6 +126,44 @@ jobs:
         xcodebuild: true
         xcodebuild-device-type: ${{ matrix.device-type }}
 
+  uikit-catalyst:
+    runs-on: macos-14
+    steps:
+    - name: Force Xcode 15.4
+      run: sudo xcode-select -switch /Applications/Xcode_15.4.app
+
+    - name: Swift version
+      run: swift --version
+
+    - name: Install xcbeautify
+      run: brew install xcbeautify
+
+    - uses: actions/checkout@v3
+
+    - name: Build
+      run: |
+        set -uxo pipefail
+        buildtarget () {
+          # Use the same derived data path as DocC compilation so that we don't duplicate work.
+          xcodebuild -derivedDataPath /tmp/data -skipMacroValidation -scheme "$1" -destination "variant=Mac Catalyst,arch=arm64,platform=macOS" build | xcbeautify --renderer github-actions
+        }
+
+        buildtarget SwiftCrossUI
+        buildtarget UIKitBackend
+
+        cd Examples
+
+        buildtarget CounterExample
+        buildtarget GreetingGeneratorExample
+        buildtarget NavigationExample
+        buildtarget StressTestExample
+        buildtarget NotesExample
+        buildtarget PathsExample
+        buildtarget ControlsExample
+        buildtarget RandomNumberGeneratorExample
+        # TODO test whether this works on Catalyst
+        # buildtarget SplitExample
+
   windows:
     runs-on: windows-latest
     defaults:

Package.resolved

@@ -142,7 +142,7 @@ final class UITableViewPicker: WrapperWidget<UITableView>, Picker, UITableViewDe
 extension UIKitBackend {
     public func createPicker() -> Widget {
         #if targetEnvironment(macCatalyst)
-            if UIDevice.current.userInterfaceIdiom == .mac {
+            if #available(macCatalyst 14, *), UIDevice.current.userInterfaceIdiom == .mac {
                 return UITableViewPicker()
             } else {
                 return UIPickerViewPicker()