Overview

I'm developing a VisionOS app with bouncing ball physics and struggling to achieve natural bouncing behavior using RealityKit's physics system. Despite following Apple's recommended parameters, the ball loses significant energy on each bounce and doesn't behave like a real basketball, tennis ball, or football would. With identical physics parameters (restitution = 1.0), RealityKit shows significant energy loss. I've had to implement a custom physics system to compensate, but I want to use native RealityKit physics. It's impossible to make it work by applying custom impulses. Ball Physics Setup (Following Apple Forum Recommendations) // From PhysicsManager.swift private func createBallEntityRealityKit() -> Entity { let ballRadius: Float = 0.05 let ballEntity = Entity() ballEntity.name = "bouncingBall" // Mesh and material let mesh = MeshResource.generateSphere(radius: ballRadius) var material = PhysicallyBasedMaterial() material.baseColor = .init(tint: .cyan) material.roughness = .float(0.3) material.metallic = .float(0.8) ballEntity.components.set(ModelComponent(mesh: mesh, materials: [material])) // Physics setup from Apple Developer Forums let physics = PhysicsBodyComponent( massProperties: .init(mass: 0.624), // Seems too heavy for 5cm ball material: PhysicsMaterialResource.generate( staticFriction: 0.8, dynamicFriction: 0.6, restitution: 1.0 // Perfect elasticity, yet still loses energy ), mode: .dynamic ) ballEntity.components.set(physics) ballEntity.components.set(PhysicsMotionComponent()) // Collision setup let collisionShape = ShapeResource.generateSphere(radius: ballRadius) ballEntity.components.set(CollisionComponent(shapes: [collisionShape])) return ballEntity } Ground Plane Physics // From GroundPlaneView.swift let groundPhysics = PhysicsBodyComponent( massProperties: .init(mass: 1000), material: PhysicsMaterialResource.generate( staticFriction: 0.7, dynamicFriction: 0.6, restitution: 1.0 // Perfect bounce ), mode: .static ) entity.components.set(groundPhysics) Wall Physics // From WalledBoxManager.swift let wallPhysics = PhysicsBodyComponent( massProperties: .init(mass: 1000), material: PhysicsMaterialResource.generate( staticFriction: 0.7, dynamicFriction: 0.6, restitution: 0.85 // Slightly less than ground ), mode: .static ) wall.components.set(wallPhysics) Collision Detection // From GroundPlaneView.swift content.subscribe(to: CollisionEvents.Began.self) { event in guard physicsMode == .realityKit else { return } let currentTime = Date().timeIntervalSince1970 guard currentTime - lastCollisionTime > 0.1 else { return } if event.entityA.name == "bouncingBall" || event.entityB.name == "bouncingBall" { let normal = event.collision.normal // Distinguish between wall and ground collisions if abs(normal.y) < 0.3 { // Wall bounce print("Wall collision detected") } else if normal.y > 0.7 { // Ground bounce print("Ground collision detected") } lastCollisionTime = currentTime } } Issues Observed Energy Loss: Despite restitution = 1.0 (perfect elasticity), the ball loses ~20-30% energy per bounce Wall Sliding: Ball tends to slide down walls instead of bouncing naturally No Damping Control: Comments mention damping values but they don't seem to affect the physics Change in mass also doesn't do much. Custom Physics System (Workaround) I've implemented a custom physics system that manually calculates velocities and applies more realistic restitution values: // From BouncingBallComponent.swift struct BouncingBallComponent: Component { var velocity: SIMD3<Float> = .zero var angularVelocity: SIMD3<Float> = .zero var bounceState: BounceState = .idle var lastBounceTime: TimeInterval = 0 var bounceCount: Int = 0 var peakHeight: Float = 0 var totalFallDistance: Float = 0 enum BounceState { case idle case falling case justBounced case bouncing case settled } } Is this energy loss expected behavior in RealityKit, even with perfect restitution (1.0)? Are there additional physics parameters (damping, solver iterations, etc.) that could improve bounce behavior? Would switching to Unity be necessary for more realistic ball physics, or am I missing something in RealityKit? Even in the last video here: https://stepinto.vision/example-code/collisions-physics-physics-material/ bounce of the ball is very unnatural - stops after 3-4 bounces. I apply custom impulses, but then if I have walls around the ball, it's almost impossible to make it look natural. I also saw this post https://developer.apple.com/forums/thread/759422 and ball is still not bouncing naturally.

Hello, I am an Apple Developer and I have been unable to access my Apple ID for more than a week because of a verification code issue. Every time I try to sign in to my Apple ID or manage my banking information, I see this error message: “Too many verification codes have been sent. Enter the last verification code you received or try again later.” The problem is that I am not receiving any SMS verification codes at all, so I cannot enter any “last code”, and I cannot complete the sign-in process. I have already tried the following: Waited more than 24 hours without requesting new codes, several times. Tried signing in from different devices and networks. Confirmed that my phone number is active and can receive other SMS messages from different services. The issue persists and I am effectively locked out of my Apple ID. This is a critical problem for me because it directly affects my Apple Developer work: I cannot sign in to App Store Connect. I cannot add or edit my banking information. I cannot upload my app or submit it for review. I also do not have another phone number that I can add as a trusted phone number, so I cannot simply switch to a different number. I kindly ask for a concrete technical solution or manual intervention for my Apple ID, not just “wait 24 hours and try again”, because I have already done that multiple times and the error is still there. Could you please: check if there is a block or rate limit on verification codes for my account, and help reset it or provide another way to verify my identity and restore access to my Apple ID, or assist me with updating my trusted phone number after verifying my identity? This issue is blocking my ability to continue development and release of my app on the App Store, so I would really appreciate any escalation to the appropriate technical team. Thank you very much for your help. Best regards, Daniil

When I try to get a new API Key I get the following error. "API Keys cannot be created due to an invalid Program License Agreement. Please update this agreement and try your request again." I have been to the agreement section, and it says: "Issued October 8, 2025. Accepted November 19, 2025." Any idea why I still get this error?? Not sure if that makes a difference. I had a paid account, but I didn't renew it because I don't need it anymore, and I was told that I can still use this account for free for app testing.

​ My app has been rejected multiple times during the last few weeks because Apple reviewer is unable to complete the purchase on revenue cat paywall. They gave this error message: Guideline 2.1 - Performance - App Completeness We were still unable to purchase the subscription successfully. Review device details: Device type: iPad Air 11-inch (M2) OS version: iPadOS 26.1 Next Steps When validating receipts on your server, your server needs to be able to handle a production-signed app getting its receipts from Apple’s test environment. The recommended approach is for your production server to always validate receipts against the production App Store first. If validation fails with the error code "Sandbox receipt used in production," you should validate against the test environment instead. Resources Note that in-app purchases do not need to have been previously approved to confirm they function correctly in review. Note that the Account Holder must accept the Paid Apps Agreement in the Business section of App Store Connect before paid in-app purchases will function. Learn how to set up and test in-app purchase products in the sandbox environment. Learn more about validating receipts with the App Store.   The offerings are fetched correctly but they are unable to complete the purchase. I tested on my physical iPhone with real account (not sandbox) and get the same exact error. I have provided screenshot of the paywall screen and my App Store Connect pages below. I think issue might be because my subscriptions on App Store are not approved but I’m not sure. I heard you are supposed to submit them same time when you submit your build. I submitted both but Apple also rejected my subscriptions saying the images were duplicate. Now they say “developer action needed” First of all, it says the images are optional so why does it matter what they are? Second of all, what image am I supposed to provide there then?  Guideline 2.3.2 - Performance - Accurate Metadata We noticed that your promotional image to be displayed on the App Store does not sufficiently represent the associated promoted in-app purchase and/or win back offer. Specifically, we found the following issue with your promotional image: – You submitted duplicate or identical promotional images for different promoted in-app purchase products and/or win back offers. Next Steps To resolve this issue, please revise your promotional image to ensure it is unique and accurately represents the associated promoted in-app purchase and/or win back offer. If you have no future plans on promoting this in-app purchase product, you can delete the associated promotional image in App Store Connect. Resources Learn how to view and edit in-app purchase information in App Store Connect. Discover more best practices for promoting your in-app purchases on the App Store.   Support Reply to this message in your preferred language if you need assistance. If you need additional support, use the Contact Us module. Consult with fellow developers and Apple engineers on the Apple Developer Forums. Request an App Review Appointment at Meet with Apple to discuss your app's review. Appointments subject to availability during your local business hours on Tuesdays and Thursdays. Provide feedback on this message and your review experience by completing a short survey.     ​

Hello everyone! I found a weird behavior with the animation of Menucomponent on iOS 26.1 When the menu disappear the animation is very glitchy You can find here a sample of code to reproduce it @available(iOS 26.0, *) struct MenuSample: View { var body: some View { GlassEffectContainer { HStack { Menu { Button("Action 1") {} Button("Action 2") {} Button("Delete", role: .destructive) {} } label: { Image(systemName: "ellipsis") .padding() } Button {} label: { Image(systemName: "xmark") .padding() } } .glassEffect(.clear.interactive()) } } } @available(iOS 26.0, *) #Preview { MenuSample() .preferredColorScheme(.dark) } I did two videos: iOS 26.0 iOS 26.1 Thanks for your help

Please help me reach the release on time. We submitted the app for Apple Review and are constantly receiving rejection. Last time they shared a screenshot with error: SKErrorDomain error 5. Bank details, Agreement, and Tax are in place. We tested it on 7 different devices and Apple IDs in TestFlight, along with the same device and OS they used for review, and it's working perfectly. I was able to found multiple posts of the same errors but with no solution. Please help those who have faced the same.

Hi everyone, I think this is a simple issue. I got the following error message" "PreviewDevice is ignored in a #Preview macro. Use the device picker at the bottom of the Canvas to change which device type is used for the preview. (from macro 'Preview')" after this line: ".previewDevice(PreviewDevice(rawValue: "iPhone 17 Pro"))" But in my Canvas I do not see the device picker. Thank you.

Hi everyone, I’m not sure if this is the right place for it, but I wanted to share a bit of my background and ask for advice from developers who’ve been in the industry longer than me. I started learning to make games when I was a kid using Game Maker. Later I got into Unity and even worked a few years as a solo developer for small startups — building Unity apps, VR projects, AR demos, websites, servers, everything. But I never had a real team, never had mentorship, and none of the projects I worked on ever reached production or real users. Life changed and I moved to the US, where I had to switch careers completely. Now I’m trying to come back to software development, but I’m struggling with a feeling that I’m “not good enough” anymore. The tech world has moved so fast, and companies like OpenAI, Meta, Epic, etc., feel way out of reach. So my question to the community is: How did you get started in your career? Did you ever feel like you weren’t good enough? How did you push through that and continue improving? Any honest advice would help a lot. Thanks.

After dropping an A-record TTL to 60 secs (it was previously no higher than 600 secs for several weeks) and making an IP change for a small business website on Monday, I took down the old web service just over 24 hours later on Tuesday evening. We then had reports of some customers not being able to access the website on Wednesday morning. On investigation using my iPhone it would appear that Apple Private Relay is still directing clients to the old IP address. It's just as well I have iCloud+ as I would never have seen this issue otherwise and would have been none the wiser as to why some customers were having problems. Has anyone else seen this and/or have a fix other than waiting longer? Do you know how long it takes for Apple Private Relay to update? This isn't expected behaviour of DNS? I spoke to someone at Apple yesterday and there wasn't much they can do. I hope they're escalating internally as almost 3 days later it's still pointing users to the old IP address despite having ample time for proper DNS propagation.

I'm building a macOS app using SwiftUI, and I want to create a draggable floating webcam preview window Right now, I have something like this: import SwiftUI import AVFoundation struct WebcamPreviewView: View { let captureSession: AVCaptureSession? var body: some View { ZStack { if let session = captureSession { CameraPreviewLayer(session: session) .clipShape(RoundedRectangle(cornerRadius: 50)) .overlay( RoundedRectangle(cornerRadius: 50) .strokeBorder(Color.white.opacity(0.2), lineWidth: 2) ) } else { VStack(spacing: 8) { Image(systemName: "video.slash.fill") .font(.system(size: 40)) .foregroundColor(.white.opacity(0.6)) Text("No Camera") .font(.caption) .foregroundColor(.white.opacity(0.6)) } } } .shadow(color: .black.opacity(0.3), radius: 10, x: 0, y: 5) } } struct CameraPreviewLayer: NSViewRepresentable { let session: AVCaptureSession func makeNSView(context: Context) -> NSView { let view = NSView() view.wantsLayer = true let previewLayer = AVCaptureVideoPreviewLayer(session: session) previewLayer.videoGravity = .resizeAspectFill previewLayer.frame = view.bounds view.layer = previewLayer return view } func updateNSView(_ nsView: NSView, context: Context) { if let previewLayer = nsView.layer as? AVCaptureVideoPreviewLayer { previewLayer.frame = nsView.bounds } } } This is my SwiftUI side code to show the webcam, and I am trying to create it as a floating window which appears on top of all other apps windows etc. however, even when the webcam is clicked, it should not steal the focus from other apps, the other apps should be able to function properly as they already are. import Cocoa import SwiftUI class WebcamPreviewWindow: NSPanel { private static let defaultSize = CGSize(width: 200, height: 200) private var initialClickLocation: NSPoint = .zero init() { let screenFrame = NSScreen.main?.visibleFrame ?? .zero let origin = CGPoint( x: screenFrame.maxX - Self.defaultSize.width - 20, y: screenFrame.minY + 20 ) super.init( contentRect: CGRect(origin: origin, size: Self.defaultSize), styleMask: [.borderless], backing: .buffered, defer: false ) isOpaque = false backgroundColor = .clear hasShadow = false level = .screenSaver collectionBehavior = [ .canJoinAllSpaces, .fullScreenAuxiliary, .stationary, .ignoresCycle ] ignoresMouseEvents = false acceptsMouseMovedEvents = true hidesOnDeactivate = false becomesKeyOnlyIfNeeded = false } // MARK: - Focus Prevention override var canBecomeKey: Bool { false } override var canBecomeMain: Bool { false } override var acceptsFirstResponder: Bool { false } override func makeKey() { } override func mouseDown(with event: NSEvent) { initialClickLocation = event.locationInWindow } override func mouseDragged(with event: NSEvent) { let current = event.locationInWindow let dx = current.x - initialClickLocation.x let dy = current.y - initialClickLocation.y let newOrigin = CGPoint( x: frame.origin.x + dx, y: frame.origin.y + dy ) setFrameOrigin(newOrigin) } func show<Content: View>(with view: Content) { let host = NSHostingView(rootView: view) host.autoresizingMask = [.width, .height] host.frame = contentLayoutRect contentView = host orderFrontRegardless() } func hide() { orderOut(nil) contentView = nil } } This is my Appkit Side code make a floating window, however, when the webcam preview is clicked, it makes it as the focus app and I have to click anywhere else to loose the focus to be able to use the rest of the windows.

Hello everyone, I am developing a Flutter iOS application that includes a Widget Extension + Live Activity (ActivityKit). The project runs successfully on the iOS simulator when launched directly from Xcode, but it cannot be signed properly via Flutter and I cannot upload the build to App Store Connect due to the following CodeSign error: Command CodeSign failed with a nonzero exit code Provisioning profile "…" doesn't include the entitlement: com.apple.developer.activitykit.allow-third-party-activity This error never goes away no matter what I try. And the main problem is that my App ID does NOT show any ActivityKit or Live Activity capability in the Apple Developer portal → Identifiers → App ID. So I cannot enable it manually. However: Xcode requires this entitlement Flutter requires this entitlement When I add the entitlement manually in the .entitlements file, Xcode says: “This entitlement must be enabled in your Developer account. It cannot be added manually.” So I am stuck in a loop where: Apple Developer portal does not show ActivityKit capability Xcode demands the ActivityKit entitlement Signing fails App Store upload fails And Live Activity is a critical feature of my app What I have already done ✔ “Automatically manage signing” is enabled ✔ Correct Team is selected for both Runner and the Widget Extension ✔ Bundle IDs are correct: com.yksbuddy.app com.yksbuddy.app.TimerWidgetExtension ✔ Deleted Derived Data completely ✔ Tried removing all ActivityKit-related entitlement keys manually ✔ Deleted Pods, reinstalled, rebuilt ✔ App Group settings match between Runner and Extension ✔ The same Live Activity code works perfectly in a clean Xcode-only project ✔ But fails only inside a Flutter project structure ✔ Xcode builds & runs on simulator, but App Store upload always fails due to missing entitlement Core Problem: In my Apple Developer “Identifiers → App ID” page, the Live Activity / ActivityKit capability does NOT appear at all, so I cannot enable: Live Activities ActivityKit Third-party activity entitlement Without being able to enable this capability, I cannot create a valid provisioning profile that includes: com.apple.developer.activitykit.allow-third-party-activity Flutter + Xcode insists this entitlement must exist, but Apple Developer portal does not give any option to enable it.

Hi, I am using xCode26.x. But my Metal4 classes are not compiling. I downloaded the sample code from Apple's website - https://developer.apple.com/documentation/Metal/processing-a-texture-in-a-compute-function. For example, I am getting errors like "Cannot find protocol declaration for 'MTL4CommandQueue'; I have hit a deadline. Any recommendations are very welcome. I have downloaded the Metal Tool chain. When I run the following commands on the terminal - xcodebuild -showComponent metalToolchain ; xcrun -f metal ; xcrun metal --version I get the following response - Asset Path: /System/Library/AssetsV2/com_apple_MobileAsset_MetalToolchain/86fbaf7b114a899754307896c0bfd52ffbf4fded.asset/AssetData Build Version: 17A321 Status: installed Toolchain Identifier: com.apple.dt.toolchain.Metal.32023 Toolchain Search Path: /Users/private/Library/Developer/DVTDownloads/MetalToolchain/mounts/86fbaf7b114a899754307896c0bfd52ffbf4fded /Users/private/Library/Developer/DVTDownloads/MetalToolchain/mounts/86fbaf7b114a899754307896c0bfd52ffbf4fded/Metal.xctoolchain/usr/bin/metal Apple metal version 32023.830 (metalfe-32023.830.2) Target: air64-apple-darwin24.6.0 Thread model: posix InstalledDir: /Users/private/Library/Developer/DVTDownloads/MetalToolchain/mounts/86fbaf7b114a899754307896c0bfd52ffbf4fded/Metal.xctoolchain/usr/metal/current/bin

I recently reviewed the device management restrictions page of the developer docs (https://developer.apple.com/documentation/devicemanagement/restrictions) and noticed that several items are now marked "In a future release, this restriction will begin requiring supervision." Some of these changes are likely to have a dramatic impact on our app and business! So my question is threefold: a) where can I find out or request more information about the planned changes (e.g. timeline would be especially helpful)? b) why are these changes being implemented at all? c) to whom / where can I protest these changes (aside from this forum and feedback assistant)?

I am getting this issue when trying to accept an invite to a new test version of our app. ****Unable to Accept invite This invitation cannot be accepted because your Apple Account, xxxxxxxx.me.com, has already been associated to this app.**** Can you help please?

Hello to all I have coded in swift a headless app, that launches 3 go microservices and itself. The app listens via unix domain sockets for commands from the microservices and executes different VPN related operations, using the NEVPNManager extension. Because there are certificates and VPN operations, the headless app and two Go microservices must run as root. The app and microservices run perfectly when I run in Xcode launching the swift app as root. However, I have been trying for some weeks already to modify the application so at startup it requests the password and runs as root or something similar, so all forked apps also run as root. I have not succeeded. I have tried many things, the last one was using SMApp but as the swift app is a headless app and not a CLI command app it can not be embedded. And CLI apps can not get the VPN entitlements. Can anybody please give me some pointers how can I launch the app so it requests the password and runs as root in background or what is the ideal framework here? thank you again.

Hi Given a simple multiplatform app about Mushrooms, stored in SwiftData, hosted in iCloud using a TextEditor @Model final class Champignon: Codable { var nom: String = "" ../.. @Attribute(.externalStorage) var attributedStringData: Data = Data() var attributedString: AttributedString { get { do { return try JSONDecoder().decode(AttributedString.self, from: attributedStringData) } catch { return AttributedString("Failed to decode AttributedString: \(error)") } } set { do { self.attributedStringData = try JSONEncoder().encode(newValue) } catch { print("Failed to encode AttributedString: \(error)") } } } ../.. Computed attributedString is used in a TextEditor private var textEditorView: some View { Section { TextEditor(text: $model.attributedString) } header: { HStack { Text("TextEditor".localizedUppercase) .foregroundStyle(.secondary) Spacer() } } } Plain Text encode, decode and sync like a charm through iOS and macOS Use of "FontAttributes" (Bold, Italic, …) works the same But use of "ForegroundColorAttributes" trigger an error : Failed to decode AttributedString: dataCorrupted(Swift.DecodingError.Context(codingPath: [_CodingKey(stringValue: "Index 3", intValue: 3), AttributeKey(stringValue: "SwiftUI.ForegroundColor", intValue: nil), CodableBoxCodingKeys(stringValue: "value", intValue: 1)], debugDescription: "Platform color is not available on this platform", underlyingError: nil)) Is there a way to encode/decode attributedString data platform conditionally ? Or another approach ? Thanks for advices

It has been two years since I wrote my a SwiftUI app, and I wanted to start again in Xcode 26. I can no longer see the attributes inspector when I select an element in the canvas. This was an Xcode feature that was very helpful as I am still a novice. Has this feature been deprecated in Xcode 26? And if not, please help explain how I can find and use it.

We are currently implementing a custom iCloud sync for our macOS and iOS apps using CloudKit. Syncing works fine as long as the number of record sends is relatively small. But when we test with a large number of changes ( 80,000+ CKRecords ) we start running into problems. Our sending strategy is very conservative to avoid rate limits: We send records sequentially in batches of 250 records With about 2 seconds pause between operations Records are small and contain no assets (assets are uploaded separately) At some point we start receiving: “Database commit size exceeds limit” After that, CloudKit begins returning rate-limit errors with retryAfter-Information in the error. We wait for the retry time and try again, but from this moment on, nothing progresses anymore. Every subsequent attempt fails. We could not find anything in the official documentation regarding such a “commit size” limit or what triggers this failure state. So my questions are: Are there undocumented limits on the total number of records that can exist in an iCloud database (private or shared)? Is there a maximum volume of record modifications a container can accept within a certain timeframe, even if operations are split into small batches with pauses? Is it possible that sending large numbers of records in a row can temporarily or permanently “stall” a CloudKit container? Any insights or experiences would be greatly appreciated. Thank you!

Hi everyone! When I attempt the Post Request using Postman, as shown in my attached curl, I receive the error "{ "errors": [ { "status": "405", "code": "METHOD_NOT_ALLOWED", "title": "The request method is not valid for the resource path.", "detail": "The request method used for this request is not valid for the resource path. Please consult the documentation." } ] }". I have constructed the JWT correctly as an admin with correct private Key and Unix Times and I am able to send regular GET requests without issue and I can view the dashboards in App Store Connect. The described POST request is being rejected, although it says so in the documentation: https://developer.apple.com/documentation/appstoreconnectapi/post-v1-analyticsreportrequests. Curl: curl --location 'https://api.appstoreconnect.apple.com/v1/analyticsReportRequests' --header 'Content-Type: application/json' --header 'Authorization: Bearer XXX' --data '{ "data": { "type": "analyticsReportRequests", "attributes": { "accessType": "ONGOING" }, "relationships": { "app": { "data": { "type": "apps", "id": "XXXXXXXXXX" } } } } }' (using ONE_TIME_SNAPSHOT makes no difference) Is this a documentation error ? I'd be happy to hear about a fix.

I'm using Xcode Cloud to build for internal TestFlight testing. But it stuck in Archive. No warning or error. Unable to complete the workflow. What could be causing this? I have absolutely no idea what to do now.