Hi, I am trying to export the following SwiftUI View to PDF using UIGraphicsPDFRenderer. The problem I am getting is there is somehow a margin on top of the exported PDF. The code I am using import SwiftUI struct ContentView: View {     var body: some View {         let pressGesture = TapGesture()                .onEnded { value in                    let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!                    let outputFileURL = documentDirectory.appendingPathComponent("SwiftUI.pdf")                    let pdfVC = UIHostingController(rootView: self)                    let pageSize = CGSize(width: 2.625 * 72.0, height: 1.0 * 72.0)                    pdfVC.view.frame = CGRect(origin: .zero, size: pageSize)                    let rootVC = UIApplication.shared.windows.first?.rootViewController                    rootVC?.addChild(pdfVC)                    rootVC?.view.insertSubview(pdfVC.view, at: 0)                    let pdfRenderer = UIGraphicsPDFRenderer(bounds: CGRect(x: 0, y: 0, width: pageSize.width, height: pageSize.height))                    DispatchQueue.main.async {                         do {                                                                                 try pdfRenderer.writePDF(to: outputFileURL, withActions: { (context) in                                 context.beginPage()                                 pdfVC.view.layer.render(in: context.cgContext)                             })                             print("wrote file to: (outputFileURL.path)")                             pdfVC.removeFromParent()                             pdfVC.view.removeFromSuperview()                                              } catch {                             print("Could not create PDF file: (error.localizedDescription)")                         }                     }                                }         VStack(){                 Text("Hello")         }         .frame(width: 2.625 * 72.0, height: 1.0 * 72.0, alignment: .center)         .gesture(pressGesture)         .background(Color.red)     } } May I know what am I doing wrong? Thanks in advance.

Hi, I enabled Mac Catalyst (macOS12.1) for an app, set Optimise Interface for Mac with the following code. The code can be compiled with "Build Succeeded" and can be run successfully on an M1 Mac. However the editor will flag out the following: 'horizontalSizeClass' is unavailable in macOS and with build time issues. If I use UIViewControllerRepresentable it will give Cannot find type 'UIViewControllerRepresentable' in scope The app does run ok. Am I missing something? import SwiftUI struct ContentView: View { @Environment(.horizontalSizeClass) var horizontalSizeClass: UserInterfaceSizeClass?     var body: some View {         if horizontalSizeClass == .compact {             Text("Compact")         } else {             Text("Regular")         }               } } Thanks in advance.

I understand that a Company’s hardware vendor ID is required for requesting Entitlements for DriverKit. Does this means DriverKit is only targeted for hardware vendors? Does Apple allows third party (not the hardware vendor) entitlements for DriverKit? Our company is exploring the development of generic open source drivers on iPad for label printers such as those by Zebra. Is this allowed?

I am porting an existing app to iOS16. It contains a NavigationView that looks like the following: var body: some View { NavigationView { VStack { Text("Main Content") .frame(height: 400) NavigationView { NavigationLink(destination: Text("Navigation Detail") ) { Text("Navigation Link") } .navigationTitle("Properties Frame") .navigationBarTitleDisplayMode(.inline) }.navigationViewStyle(.stack) } .navigationTitle("Main Frame") .navigationBarTitleDisplayMode(.inline) } .navigationViewStyle(.stack) } Clicking on Navigation Link gives the following (as originally intended) : When the above is ported to NavigationStack  var body: some View {         NavigationStack {             VStack {                 Text("Main Content")                     .frame(height: 400)                               NavigationStack {                     NavigationLink(destination:                       Text("Navigation Detail")                     )                     {                         Text("Navigation Link")                     }                     .navigationTitle("Properties Frame")                     .navigationBarTitleDisplayMode(.inline)                 }             }             .navigationTitle("Main Frame")             .navigationBarTitleDisplayMode(.inline)         }     } It gives a full screen Properties Frame when clicking on Navigation Link: Will be grateful for any suggestions on how I can achieve the same behavior (half screen Properties Frame) as NavigationView in NavigationStack. Leaving the code as NavigationView (Deprecated) in iOS16 does still work. Or does it means, I should move away from the above half screen design. It is still useful to see the changes to the Main Content when changing the properties.

Hi, Does anyone have any ideas how to save a generated scene/mesh in RealityView to USDZ? And is there any way to save animations?

Is there a way to move a Rigged Character with its Armature Bones in ARKit/RealityKit? I am trying to do this When I try to move using JointTransform the usdz robot provided in https://developer.apple.com/documentation/arkit/arkit_in_ios/content_anchors/capturing_body_motion_in_3d It gives me the following: I see the documentation on Character Rigging etc. But is the movement through armature bones only available through a third party software. Or can it be done in Reality Kit/Arkit/RealityView? https://developer.apple.com/documentation/arkit/arkit_in_ios/content_anchors/rigging_a_model_for_motion_capture

In visionOS simulator, a ContactPicker for Multiple contacts selection is shown without the Done button. Can I assume this behavior will be OK on an actual Vision Pro? I could not get a list of contacts to be selected. On iOS, the Done button is shown ok as follows: import ContactsUI import Combine struct ContactPickerView: View { @State private var pickedNumber: String? @StateObject private var coordinator = Coordinator() var body: some View { VStack { Button("Open Contact Picker") { openContactPicker() } .padding() Text(pickedNumber ?? "") .padding() } .onReceive(coordinator.$pickedNumber, perform: { phoneNumber in self.pickedNumber = phoneNumber }) .environmentObject(coordinator) } func openContactPicker() { let contactPicker = CNContactPickerViewController() contactPicker.delegate = coordinator let scenes = UIApplication.shared.connectedScenes let windowScenes = scenes.first as? UIWindowScene let window = windowScenes?.windows.first window?.rootViewController?.present(contactPicker, animated: true, completion: nil) } class Coordinator: NSObject, ObservableObject, CNContactPickerDelegate { @Published var pickedNumber: String? func contactPicker(_ picker: CNContactPickerViewController, didSelect contacts: [CNContact]){ print(contacts) contacts.forEach { contact in for number in contact.phoneNumbers { let phoneNumber = number.value print("number is = \(phoneNumber)") } } } } }

We have an app that is saving UIColor through NSKeyedArchiver.archivedData to a file. Now we are trying to port the app to a Mac and will like to load the UIColor. But on a Mac, we are using NSColor. Are there any recommendations of what I can do?

I have the following TaskExecutor code in Swift 6 and is getting the following error: //Error Passing closure as a sending parameter risks causing data races between main actor-isolated code and concurrent execution of the closure. May I know what is the best way to approach this? This is the default code generated by Xcode when creating a Vision Pro App using Metal as the Immersive Renderer. Renderer @MainActor static func startRenderLoop(_ layerRenderer: LayerRenderer, appModel: AppModel) { Task(executorPreference: RendererTaskExecutor.shared) { //Error let renderer = Renderer(layerRenderer, appModel: appModel) await renderer.startARSession() await renderer.renderLoop() } } final class RendererTaskExecutor: TaskExecutor { private let queue = DispatchQueue(label: "RenderThreadQueue", qos: .userInteractive) func enqueue(_ job: UnownedJob) { queue.async { job.runSynchronously(on: self.asUnownedSerialExecutor()) } } func asUnownedSerialExecutor() -> UnownedTaskExecutor { return UnownedTaskExecutor(ordinary: self) } static let shared: RendererTaskExecutor = RendererTaskExecutor() }

Anyone can advise a newbie how to apply a displacement texture map image to a PyshicallyBaseMaterial in RealityKit? I applied the diffuse texture to PyshicallyBaseMaterial.BaseColor, roughness texture to PyshicallyBaseMaterial.Roughness, normal texture to PyshicallyBaseMaterial.Normal but have no idea what to do with a displacement texture.

Hi, I have trouble mixing Core Image CIKernel with Surface Shader/Geometry Modifier in the same project. I am getting the following error in my surface shader when I compile with -fcikernel option. RealityFoundation.CustomMaterialError.geometryModifierFunctionNotFound To simulate the problem: Compile Sample from Apple Altering RealityKit Rendering with Shader Functions https://developer.apple.com/documentation/realitykit/altering_realitykit_rendering_with_shader_functions Set Metal Compiler - Build Options Other Metal Compiler Flags -fcikernel Metal Linker - Build Options Other Metal Linker Flags -fcikernel RealityView->SetupRobots RealityFoundation.CustomMaterialError.geometryModifierFunctionNotFound Any suggestions will be great. Thank you in advance.

Hi, Has anyone gotten the human body pose in 3D sample provided at the following working? https://developer.apple.com/documentation/vision/detecting_human_body_poses_in_3d_with_vision I installed iPadOS 17 on a 9th Gen iPad. The sample load up on Mac and iPad. However after selecting an image, it goes into the spinning wheel without anything returned. I hope to play and learn more about the sample. Any pointers or help is greatly appreciated. Similarly, the Detecting animal body poses with Vision is showing up as blank for me. https://developer.apple.com/documentation/vision/detecting_animal_body_poses_with_vision Or does the samples require a device with Lidar? Thank you in advance.

I have the following piece of code that works in Swift 5 func test() { let url = Bundle.main.url(forResource: "movie", withExtension: "mov") let videoAsset = AVURLAsset(url: url!) let t1 = CMTime(value: 1, timescale: 1) let t2 = CMTime(value: 4, timescale: 1) let t3 = CMTime(value: 8, timescale: 1) let timesArray = [ NSValue(time: t1), NSValue(time: t2), NSValue(time: t3) ] let generator = AVAssetImageGenerator(asset: videoAsset) generator.requestedTimeToleranceBefore = .zero generator.requestedTimeToleranceAfter = .zero generator.generateCGImagesAsynchronously(forTimes: timesArray ) { requestedTime, image, actualTime, result, error in let img = UIImage(cgImage: image!) } } When I compile and run it in Swift 6 it gives a EXC_BREAKPOINT (code=1, subcode=0x1021c7478) I understand that Swift 6 adopts strict concurrency. My question is if I start porting my code, what is the recommended way to change the above code? Rgds, James

The following RealityView ModelEntity animated text works in visionOS 1.0. In visionOS 2.0, when running the same piece of code, the model entity move duration does not seem to work. Are there changes to the way it works that I am missing? Thank you in advance. RealityView { content in let textEntity = generateMovingText() content.add(textEntity) _ = try? await arkitSession.run([worldTrackingProvider]) } update: { content in guard let entity = content.entities.first(where: { $0.name == .textEntityName}) else { return } if let pose = worldTrackingProvider.queryDeviceAnchor(atTimestamp: CACurrentMediaTime()) { entity.position = .init( x: pose.originFromAnchorTransform.columns.3.x, y: pose.originFromAnchorTransform.columns.3.y, z: pose.originFromAnchorTransform.columns.3.z ) } if let modelEntity = entity as? ModelEntity { let rotation = Transform(rotation: simd_quatf(angle: -.pi / 6, axis: [1, 0, 0])) // Adjust angle as needed modelEntity.transform = Transform(matrix: rotation.matrix * modelEntity.transform.matrix) let animationDuration: Float = 60.0 // Adjust the duration as needed let moveUp = Transform(scale: .one, translation: [0, 2, 0]) modelEntity.move(to: moveUp, relativeTo: modelEntity, duration: TimeInterval(animationDuration), timingFunction: .linear) } } The source is available at the following: https://github.com/Sebulec/crawling-text

We are hoping to port our app which requires printing to visionOS. Can I check if visionOS supports AirPrint/printing? If anyone has already done it, anything we should watch out for?