allow macos build for cross platform apps, but added warning when bui…

…lding for simulator or macOS

Package.swift

@@ -1,11 +1,11 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.1
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
   name: "FocusEntity",
-  platforms: [.iOS("13.0")],
+  platforms: [.iOS(.v13), .macOS(.v10_15)],
   products: [
     .library(name: "FocusEntity", targets: ["FocusEntity"])
   ],

Sources/FocusEntity/FocusEntity.swift

@@ -11,6 +11,10 @@ import RealityKit
 import RealityFoundation
 #endif
 
+#if os(macOS) || targetEnvironment(simulator)
+#warning("FocusEntity: This package is only fully available with physical iOS devices")
+#endif
+
 #if canImport(ARKit) && !targetEnvironment(simulator)
 import ARKit
 import Combine
@@ -338,7 +342,7 @@ open class FocusEntity {
         self.init()
     }
     internal init() {
-        print("This is not supported when ARKit cannot be imported or using the simulator.")
+        print("This is only supported on a physical iOS device.")
     }
 }
 #endif

Sources/FocusEntity/FocusEntityComponent.swift

@@ -7,7 +7,9 @@
 //
 
 import RealityKit
+#if !os(macOS)
 import ARKit
+#endif
 
 internal struct ClassicStyle {
     var color: Material.Color
@@ -69,7 +71,9 @@ public struct FocusEntityComponent: Component {
     )
     internal var isOpen = true
     internal var segments: [FocusEntity.Segment] = []
+    #if !os(macOS)
     public var allowedRaycast: ARRaycastQuery.Target = .estimatedPlane
+    #endif
 
     static var defaultPlane = MeshResource.generatePlane(
         width: 0.1, depth: 0.1
@@ -79,9 +83,11 @@ public struct FocusEntityComponent: Component {
         self.style = style
         // If the device has LiDAR, then default behaviour is to only allow
         // existing detected planes
+        #if !os(macOS)
         if #available(iOS 13.4, *),
            ARWorldTrackingConfiguration.supportsSceneReconstruction(.mesh) {
             self.allowedRaycast = .existingPlaneGeometry
         }
+        #endif
     }
 }