Fix Mac Catalyst build by gating AppKit code on os(macOS)

.github/workflows/build.yaml

@@ -0,0 +1,37 @@
+name: Build
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build:
+    name: Build (${{ matrix.name }})
+    runs-on: macos-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: macOS
+            destination: "platform=macOS"
+          - name: iOS
+            destination: "generic/platform=iOS"
+          - name: Mac Catalyst
+            destination: "generic/platform=macOS,variant=Mac Catalyst"
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: latest
+
+      - name: Build
+        run: |
+          xcodebuild build \
+            -scheme RichText \
+            -destination "${{ matrix.destination }}"

Sources/RichText/Attributes & Attachments/AttributeContainer++.swift

@@ -13,7 +13,7 @@ extension AttributeContainer {
         mergePolicy: AttributedString.AttributeMergePolicy = .keepNew,
         perform transform: (NSMutableParagraphStyle) -> Void
     ) {
-        #if canImport(AppKit)
+        #if os(macOS)
         let paragraphStyle = self[keyPath: \.appKit.paragraphStyle] ?? .init()
         #elseif canImport(UIKit)
         let paragraphStyle = self[keyPath: \.uiKit.paragraphStyle] ?? .init()

Sources/RichText/Attributes & Attachments/InlineHostingAttachment.swift

@@ -17,7 +17,7 @@ final public class InlineHostingAttachment: NSTextAttachment {
     var rootView: AnyView
     var sizing: HostedAttachmentSizing
 
-    #if canImport(AppKit)
+    #if os(macOS)
     private var hostingController: NSHostingController<AnyView>?
     #endif
 
@@ -167,7 +167,7 @@ final public class InlineHostingAttachment: NSTextAttachment {
 
     @MainActor
     lazy var hostingView: PlatformView = {
-        #if canImport(AppKit)
+        #if os(macOS)
         let hostingController = NSHostingController(rootView: hostingRootView)
         hostingController.sizingOptions = .intrinsicContentSize
         self.hostingController = hostingController
@@ -190,7 +190,7 @@ final public class InlineHostingAttachment: NSTextAttachment {
         self.replacement = attachment.replacement
         self.sizing = attachment.sizing
 
-        #if canImport(AppKit)
+        #if os(macOS)
         hostingController?.rootView = hostingRootView
         #elseif canImport(UIKit)
         hostingController?.rootView = hostingRootView

Sources/RichText/Attributes & Attachments/RichTextAttributes.swift

@@ -9,7 +9,7 @@ import Foundation
 
 extension AttributeScopes {
     struct RichTextAttributes : AttributeScope {
-        #if canImport(AppKit)
+        #if os(macOS)
         let appKit: AttributeScopes.AppKitAttributes
         #else
         let uiKit: AttributeScopes.UIKitAttributes

Sources/RichText/Text View/InlineAttachmentTextView+AppKit.swift

@@ -5,7 +5,7 @@
 //  Created by Yanan Li on 2026/6/20.
 //
 
-#if canImport(AppKit)
+#if os(macOS)
 
 import AppKit
 

Sources/RichText/Text View/InlineAttachmentTextView+Layout.swift

@@ -42,7 +42,7 @@ extension InlineAttachmentTextView {
         cachedContentHeight = nil
         invalidateIntrinsicContentSize()
 
-        #if canImport(AppKit)
+        #if os(macOS)
         needsLayout = true
         setNeedsDisplay(bounds)
         #elseif canImport(UIKit)

Sources/RichText/Text View/InlineAttachmentTextView.swift

@@ -159,7 +159,7 @@ fileprivate extension NSMutableAttributedString {
             options: []
         ) { attrs, range, _ in
             if attrs[.foregroundColor] == nil {
-                #if canImport(AppKit)
+                #if os(macOS)
                 addAttribute(.foregroundColor, value: NSColor.labelColor, range: range)
                 #elseif canImport(UIKit)
                 addAttribute(.foregroundColor, value: UIColor.label, range: range)
@@ -170,7 +170,7 @@ fileprivate extension NSMutableAttributedString {
 
     func _fixFont(_ font: PlatformFont?, in range: NSRange) {
         let font: PlatformFont = font ?? {
-            #if canImport(AppKit)
+            #if os(macOS)
             return NSFont.systemFont(ofSize: NSFont.systemFontSize)
             #elseif canImport(UIKit)
             return UIFont.preferredFont(forTextStyle: .body)

Sources/RichText/Text View/Support/TextAttributeConverter.swift

@@ -8,7 +8,7 @@
 import CoreText
 import SwiftUI
 
-#if canImport(AppKit)
+#if os(macOS)
 typealias ViewRepresentable = NSViewRepresentable
 typealias RepresentableContext = NSViewRepresentableContext
 typealias PlatformColor = NSColor
@@ -126,7 +126,7 @@ enum TextAttributeConverter {
 
             var attributes = AttributeContainer()
             if intent.contains(.strikethrough) {
-                #if canImport(AppKit)
+                #if os(macOS)
                 attributes.appKit.strikethroughStyle = .single
                 #elseif canImport(UIKit)
                 attributes.uiKit.strikethroughStyle = .single
@@ -151,7 +151,7 @@ enum TextAttributeConverter {
         _ textView: PlatformTextView,
         configuration: TextViewRenderConfiguration
     ) {
-        #if canImport(AppKit)
+        #if os(macOS)
         textView.baseWritingDirection = NSWritingDirection(configuration.layoutDirection)
         textView.alignment = NSTextAlignment(
             configuration.multilineTextAlignment,

Sources/RichText/Text View/SwiftUI/_TextView_AppKit.swift

@@ -5,7 +5,7 @@
 //  Created by Yanan Li on 2025/8/24.
 //
 
-#if canImport(AppKit)
+#if os(macOS)
 import SwiftUI
 
 struct _TextView_AppKit: NSViewRepresentable {

Sources/RichText/TextView.swift

@@ -74,7 +74,7 @@ public struct TextView: View {
     }
 
     public var body: some View {
-        #if canImport(AppKit)
+        #if os(macOS)
         _TextView_AppKit(content: content)
         #elseif canImport(UIKit)
         _TextView_UIKit(content: content)