feat(ios): add Swift Package Manager support

Package.swift

@@ -0,0 +1,39 @@
+// swift-tools-version: 6.0
+// Built through React Native's SwiftPM autolinker, which links this package at
+// <app>/build/generated/autolinking/libs/RNCPicker. The relative package paths
+// resolve from there to the app's React Native xcframeworks and codegen output.
+// This file has no scaffolder marker, so `react-native spm scaffold` leaves it alone.
+
+import PackageDescription
+
+let package = Package(
+    name: "RNCPicker",
+    platforms: [.iOS("15.1")],
+    products: [
+        .library(name: "RNCPicker", targets: ["RNCPickerTarget"]),
+    ],
+    dependencies: [
+        .package(name: "ReactNative", path: "../../../../xcframeworks"),
+        .package(name: "React-GeneratedCode", path: "../../../ios"),
+    ],
+    targets: [
+        // Not named RNCPicker: SwiftPM would take ios/RNCPicker.h as the umbrella
+        // header and then reject the RNCPicker.xcodeproj folder next to it,
+        // excluded or not. React Native links only the product, so the target
+        // name is free.
+        .target(
+            name: "RNCPickerTarget",
+            dependencies: [.product(name: "ReactHeaders", package: "ReactNative"), .product(name: "ReactNativeHeaders", package: "ReactNative"), .product(name: "ReactNativeDependenciesHeaders", package: "ReactNative"), .product(name: "ReactAppHeaders", package: "React-GeneratedCode")],
+            path: "ios",
+            exclude: ["RNCPicker.xcodeproj"],
+            publicHeadersPath: ".",
+            // CocoaPods gets RCT_NEW_ARCH_ENABLED from install_modules_dependencies;
+            // without it every Fabric source compiles empty and the component is
+            // never registered.
+            cSettings: [.define("RCT_NEW_ARCH_ENABLED", to: "1"), .headerSearchPath(".")],
+            cxxSettings: [.define("RCT_NEW_ARCH_ENABLED", to: "1"), .headerSearchPath("."), .define("DEBUG", .when(configuration: .debug)), .define("NDEBUG", .when(configuration: .release))],
+            linkerSettings: [.linkedFramework("UIKit"), .linkedFramework("Foundation"), .linkedFramework("CoreGraphics")]
+        ),
+    ],
+    cxxLanguageStandard: .cxx20
+)

package.json

@@ -145,7 +145,8 @@
     "typings",
     "windows",
     "react-native.config.js",
-    "RNCPicker.podspec"
+    "RNCPicker.podspec",
+    "Package.swift"
   ],
   "react-native-builder-bob": {
     "source": "js",
@@ -180,5 +181,8 @@
   "workspaces": [
     "example"
   ],
-  "packageManager": "yarn@4.1.1"
+  "packageManager": "yarn@4.1.1",
+  "swiftpmConfig": {
+    "name": "RNCPicker"
+  }
 }