The title is my question.

I'm developing an app that allows you to view PDFs (music notes). I'm using PDFkit to display the pdf and need the pencilkit functionality while viewing the pdf (in the same way that you could mark up a book you are reading in iBooks when you click on the "Mark up" button). I am able to add a canvas on top of the pdf view however, I cannot save the canvas to be merged with the PDF. QuickLook offers a solution because the pencilkit looks to be built into it and works perfectly just the way I need it to, however, I don't need the other things that come with QuickLook. I desperately need your help with how I can get the pencilkit functionality on my custom PDF viewing app. At this point, I can't even find a solution for the "Mark up" button (pencil.tip.crop.circle) to be filled when tapped. Thank you in advance!

I thought that PencilKit's PKPoint force was in a some kind of interval. However I don't find anywhere a max value for this pressure property. Is there a max value? If not, how could I know the almost max pressure level value?

I've got a question about PKPoint processing. I've got an application where I have to get both image and points which generated this image. However I've checked that points have been already interpolated, so there's no way to get raw points (which I thought should be similar to display's refresh rate x seconds requested to draw). Is there a way to get raw points (not processed) and not interpolated points?

Why is there no Apple Pencil Support on the iPhone?

Hi. My goal is to convert PKDrawing to NSImage on Mac Server. For this, I use Vapor framework and receive POST request with PKDraiwng's base64 string(from PKDrawing.dataRepresentaion()). However, this task succeeds on local device, but fails on Remote Mac server. (with exact same logic & data) In failing cases, input base64 string was successfully converted to PKDrawing, but PKDrawing to NSImage converting was failed. (NSImage object is located at 0x000000 memory address) Is there any hardware dependencies to convert PKDrawing to NSImage? Please give me some help. let base64String = "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" let drawingData: PKDrawing = try! .init(data: Data(base64Encoded: base64String)!) let image = drawingData.image(from: drawingData.bounds, scale: 2) // -> fails

I have a drawing app that I created and have sold on the App Store since 2018. It requires an Apple Pencil. My app uses the azimuth feature to orient the brush pattern that is drawn on the screen. A user just contacted me and said his azimuth feature is not working. Now it works fine for me, and I have not heard complaints from other users, so this leads me to believe it could be a problem with his Pencil. I wanted to show my code just to rule out that the problem is on my end and also get suggestions on what I should tell this user to do. Should he just contact Apple about it?                      // calculate the pencil direction let vector1 = touch.azimuthUnitVector(in: selectedCanvas) let angle = atan2(vector1.dy, vector1.dx) let azimu = angle - CGFloat(Double.pi) / 2.0 // adjust for wonky azimuth rotation translation if azimu >= -4.5 && azimu <= 0 {       rot = abs(azimu) } else {        rot = 6.2 - azimu } The azimu is then used as a point rotation in a basic Bézier curve and drawn on the screen. If it works on one iPad, it should work on all of them, right? He’s using an iPad Pro and so am I. I asked if he was using an Apple Pencil and he said yes.

I would like to adjust the PKStrokePoint of the canvas drawing in the PencilKit API. The code below should generate the same strokes, but the drawing doesn't generate well depending on the type of pen selected. func generate_sameDrawing(drawing :PKDrawing) -> PKDrawing{     var newDrawingStrokes : [PKStroke] = []           for stroke in drawing.strokes {       var newPoints : [PKStrokePoint] = []       stroke.path.forEach { (point) in         let newPoint = PKStrokePoint(location: point.location,                        timeOffset: point.timeOffset,                        size: point.size,                        opacity: point.opacity,                        force: point.force,                        azimuth: point.azimuth,                        altitude: point.altitude)         newPoints.append(newPoint)       }       let newPath = PKStrokePath(controlPoints: newPoints, creationDate: Date())       let newStroke = PKStroke(ink: PKInk(stroke.ink.inkType, color: stroke.ink.color), path: newPath)                 newDrawingStrokes.append(newStroke)             }     let newDrawing = PKDrawing(strokes: newDrawingStrokes)     return newDrawing   } Here is an image showing the result. The pen and marker generate exactly the same drawing, but with pencil type, the thickness and opacity of the stroke change, and the stroke location also moves a little. If you find any bugs/mistakes do let me know.

I have 1st gen I Pencil, After connected once its show Not connected. Then Tap for Connect its show long time for failed or out of range or make sure accessories turn on but what is the problem i couldn't understand and how can i repair it ?

Hi together, I am developing a document viewer for a specific API. I download the relevant files to a custom directory and open them using a QLPreviewController in SwiftUI. I built this with a UIViewControllerRepresentable. Everything is working fine except the saving of modified files using the pencil markup in the preview. Here is the error: https://pastebin.com/TRnfduE5 This is how my controller looks like: struct PreviewController: UIViewControllerRepresentable {     let url: URL     @Binding var isPresented: Bool          func makeUIViewController(context: Context) -> UINavigationController {         let controller = QLPreviewController()         controller.dataSource = context.coordinator         controller.navigationItem.leftBarButtonItem = UIBarButtonItem(                     barButtonSystemItem: .done, target: context.coordinator,                     action: #selector(context.coordinator.dismiss)                 )                  let navigationController = UINavigationController(rootViewController: controller)         return navigationController     }          func makeCoordinator() -> Coordinator {         return Coordinator(parent: self)     }          func updateUIViewController(_ uiViewController: UINavigationController, context: Context) {             let controller = QLPreviewController()             controller.dataSource = context.coordinator         }          class Coordinator: QLPreviewControllerDataSource {                  let parent: PreviewController                  init(parent: PreviewController) {             self.parent = parent         }                  @objc func dismiss() {             parent.isPresented = false         }                  func numberOfPreviewItems(             in controller: QLPreviewController         ) -> Int {             return 1         }                  func previewController(             _ controller: QLPreviewController, previewItemAt index: Int         ) -> QLPreviewItem {             return parent.url as QLPreviewItem         }                  func previewController(_ controller: QLPreviewController, editingModeFor previewItem: QLPreviewItem         ) -> QLPreviewItemEditingMode {             .createCopy         }                  func previewController(_: QLPreviewController, didUpdateContentsOf: QLPreviewItem){             print("Updated.")         }                  func previewController(_: QLPreviewController, didSaveEditedCopyOf: QLPreviewItem, at: URL) {             print("Saved: " + at.path)         }              } } Does anyone know, what the problem is here? And I made another experience: as you see there, I'm currently only logging the output / actions - and there isn't anything being logged, if I made just one edit. It only throws the error above after the 1st edit - so if I edit sth again and tap done or the pencil icon again... Is this ok so? Thanks for any help or advise!

Hello! I am working on an app that uses a native iOS as a base to show a 3D Room in Unity. I archive this by using: https://docs.unity3d.com/Manual/UnityasaLibrary-iOS.html I want to use iOS native because of the pencilKit support. I am now looking for the best option to share data between the two instances. I am not sure if the better way is to just let the native Swift App talk to a Realm and just send in the data I want to store from Unity to Swift, or if its possible to let both apps talk to the same database. The goal is to create a 3D Object in Unity (that has some properties like coordinates) and assign a PKDrawingFile to it. Thank you for all your help, Jakob