Hello, I have an @EnvironmentObject variable that publishes 30 times per second but the view that depends on that data must be limited to 20 frames per second. The publishing rate cannot be controlled, so I must control the rate at which SwiftUI refreshes that view in order to achieve the desired effect. I tried using TimelineView(.periodic(from: .now, by: 1/20)), but the restriction gets ignored due to the published data; I also considered Combine's timer, but it isn't based on real time. Are there any other methods I can use to force SwiftUI to refresh certain views at certain real time intervals, in essence controlling its FPS?

This morning I bought my first-ever Apple Watch for the sole purpose of development and proceeded to spend six hours failing at the first step of development: getting the device to enter developer mode and connect to Xcode. Since I'm not seeing any WatchOS 11 posts on this issue, it might just be me. This is why I'm making a new thread that's specific to WatchOS 11, Xcode 16, and maybe Series 10. Some particulars for my case: Overall __Followed Xcode 16.0 documentation On a watchOS device that you use for development, go to Settings > Privacy > Developer Mode. To toggle Developer mode, use the Developer Mode switch. To pair an Apple Watch to a Mac, connect its companion iPhone to the Mac with a cable, and ensure that the iPhone is paired for development. After this step, follow any instructions on the Apple Watch to trust the Mac. When paired through an iPhone running iOS 17 or later, Xcode connects to the Apple Watch over Wi-Fi __Tried all the folk remedies listed in the (many) previous posts on enabling development mode and connecting to Xcode iOS 18.0 __In developer mode __Connected to macOS via USB, trusts computer WatchOS 11.0 __Prompt to trust computer appears and trust is established __‘Developer Mode’ list item never appears at end of the ‘Privacy’ menu under ‘Settings’ __‘Developer’ item sometimes appears at the end of ‘Settings’ Despite never having seen or toggled ‘Developer Mode’ under ‘Privacy’ Persists across reboots Possible that WatchOS 11 eliminated the item under Settings > Privacy? If so, documentation not up to date Xcode 16.0 __Watch never appears under ‘Manage Run Destinations’ After installing sample app to phone, then attempting to install WatchOS app via iOS Watch app, “Cannot install at this time” alert appears App icon appears on watch, and tapping on it leads to an alert with, “This app cannot be installed because its integrity could not be verified”, despite wi-fi working Watch apps for other apps (e.g. Apple Store) can be successfully installed via iOS Watch app Above suggests the watch isn't truly in developer mode despite Settings > Developer appearing and persisting across reboots __The network path from Xcode to WatchOS should be clear Reconfigured router such that devices on the same network can talk to each other iPad and iPhone appear with network icon when not connected via cable and Xcode can run code on them Watch on same network as iPad and iPhone macOS 15.0 __Due to security policy, cannot use Wi-Fi (disabled both physically and via sudo /usr/sbin/networksetup -setnetworkserviceenabled 'Wi-Fi' off) Possible that Xcode can only establish a connection to WatchOS via Wi-Fi and not via ethernet bridged to wifi. If so, a confirmation would be hugely helpful. This is currently my prime suspect. Wi-fi cannot be re-enabled, so I'm trying workarounds like connecting watch to phone's hotspot (doesn't work) and somehow using phone to provide network to the Mac. __Due to security policy, firewall configured to block all incoming connections Shouldn't be an issue since Xcode doesn't need incoming connections to see non-watch devices __Due to security policy, mDNSResponder and mDNSResponderHelper disabled Also shouldn't be an issue, but including just in case

I'm currently using the extension below to determine whether an iPhone has a notch so I can adjust my UI accordingly. extension UIDevice { var hasNotch: Bool { if userInterfaceIdiom == .phone, let window = (UIApplication.shared.connectedScenes .compactMap { $0 as? UIWindowScene } .flatMap { $0.windows } .first { $0.isKeyWindow }) { return window.safeAreaInsets.bottom > 0 } return false } } (Adapted from https://stackoverflow.com/questions/73946911/how-to-detect-users-device-has-dynamic-island-in-uikit) This no longer works in iOS 26, and I have yet to find a similar method that works. Does anyone have any fixes?

I'm currently weighing moving my project from SpriteKit to RealityKit as a way to future proof it. An important part of the project involves limiting the framerate sprites are displayed at. While RealityKit seems to be set at 60FPS, my project demands a much lower framerate. I should note that I'm not using RealityKit for AR, so there's no camera passthrough to worry about. Is there a way to limit RealityKit's rendering framerate?

Hello, I had a WWDC Lab with two CloudKit engineers who asked me to file a "Feedback Request" for critical information regarding CloudKit. I've filed the FB and have also decided to post a forum post to increase my chances of having these critical questions answered. If allowed, I will also post responses to my FB here. CKAssets I would like to know how large assets attached to a CKAsset can get before being rejected by the system. If the figure differs for private and public databases, please also let me know. CloudKit pricing information There used to be pricing information available on the website, but there's basically no information now. This makes it hard to calibrate user upload limits for my app in order to avoid overage fees. I'm not looking to game the system, (something this strange opaqueness is likely meant to prevent); I'm just looking to avoid a situation where competitors and vandals abuse my the content upload system so I get smacked by large bills out of nowhere. A rough figure of how many GB of data each active user adds to my app's CloudKit public database would suffice. While we're at it, if I have two apps that share a public database (if that's possible), do the active user counts of both contribute to the public database's free threshold?

I'm a new developer who is looking to make my first app easier to manage on my end by staying in the Apple ecosystem. My ideal backend is just pure and simple CloudKit. This should help me cut down on costs and increase my security, or so I thought. The more I looked into the issue of mobile app security --more specifically, preventing fraudulent access to backend APIs-- the more it seems like CloudKit is a disaster waiting to happen. While data in transit is encrypted and there's even end-to-end encryption for private DBs, securing an app's public DB in the presence of modified apps is a daunting, if not impossible task. My assumption is that a modified app cannot be trusted to make honest assertions about itself, the device, or its iCloud account, and can potentially lie its way into restricted areas of the DB. If an app is compromised, CloudKit queries from that app can be used to make malicious queries or even changes to the databases. I'm hoping App Attest, even with its potentially circular logic, can at least make life harder for fraudsters, competitors, and vandals (when combined with other security measures like jailbreak, debugging, hooking, and tampering detections), but I have not found a single mention on how App Attest might be used to protect CloudKit. There doesn't even seem to be a verified way for me to build a third party server that can handle App Attest and then tell CloudKit to allow a user through (with all the security hazards a new developer faces when configuring an authentication server). The message seems to be: App Attest is important, but you can't use it with CloudKit, so build your own server. Questions Is my assumption that a compromised app can make malicious queries or changes to an app's CloudKit DB correct? Can App Attest be made to protect a CloudKit public DB, with or without the involvement of a third-party server to handle attestations?

Why? Why stop there? (Why not ipod.and.imacg3? applenewton.and.vision.pro?) I get why the older ipod symbols exist but these new pairings are odd. If anyone ever sees these restricted symbols in the wild, or even just someone using a Vision Pro and an iPod (Touch) together in a way that's not contrived, please do let me know!

Hello, I'd like to know whether Multipeer Connectivity (MPC) between two modern iOS devices can support cross-streaming of video content at low latency and relatively high resolution. I learned from Ghostbusters that crossing the streams is a bad idea, but I need this for my app so I'm going to ignore their sage advice. The application I have in mind involves one iOS device (A) live-streaming a feed to another iOS device  (B) running the same app. At the same time, B is live streaming its own feed to A. Both feeds don't need to be crystal clear, but there has to be low latency. The sample code for "Streaming an AR Experience" seems to contain some answers, as it's based on MPC (and ARKit), but my project isn't quite AR and the latency seems high. If MPC isn't suitable for this task (as my searches seem to indicate), is it possible to have one device set up a hotspot and link the two this way to achieve my cross-streaming ambitions? This seems like a more conservative method, assuming the hotspot and its client behave like they're wifi peers (not sure). I might start a new thread with just this question if that's more appropriate. A third idea that's not likely to work (for various reasons) is data transfer over a lightning-lightning or lightning-usb-c connection. If I've missed any other possible solutions to my cross-streaming conundrum, please let me know. I've been reading around this subject on this forum as well and would be hugely grateful if Eskimo would grace me with his wisdom.

My project involves no camera passthrough and relies heavily on sprites, but I've been discouraged from using the aging (and possibly dying) SpriteKit or SceneKit as my rendering engine by Apple engineers (here) so I'm exploring other options. Is it possible to display 2D sprites fluidly using this framework in a non-AR context? Is it possible to create, say, a 2D platformer using just RealityKit?

About a month ago I asked whether I could use HDR in SpriteKit. This wasn't a well-phrased question since HDR seems to mean different things in different questions, which probably led to my question going unanswered. What I meant to ask was whether it's possible to use assets that have a color gamut that many modern devices are capable of displaying (XDR is somewhat standard among mid- to high-end devices). In other words: Is SpriteKit keeping up with the hardware? If not, what framework options do I have that can quickly display large Rec. 2020 images? Do any of the Core frameworks offer this capability?

Hello, I'm wondering if there is a way to programmatically write a series of UIImages into an APNG, similar to what the code below does for GIFs (credit: https://github.com/AFathi/ARVideoKit/tree/swift_5). I've tried implementing a similar solution but it doesn't seem to work. My code is included below I've also done a lot of searching and have found lots of code for displaying APNGs, but have had no luck with code for writing them. Any hints or pointers would be appreciated. func generate(gif images: [UIImage], with delay: Float, loop count: Int = 0, _ finished: ((_ status: Bool, _ path: URL?) -> Void)? = nil) { currentGIFPath = newGIFPath gifQueue.async { let gifSettings = [kCGImagePropertyGIFDictionary as String : [kCGImagePropertyGIFLoopCount as String : count]] let imageSettings = [kCGImagePropertyGIFDictionary as String : [kCGImagePropertyGIFDelayTime as String : delay]] guard let path = self.currentGIFPath else { return } guard let destination = CGImageDestinationCreateWithURL(path as CFURL, __UTTypeGIF as! CFString, images.count, nil) else { finished?(false, nil); return } //logAR.message("\(destination)") CGImageDestinationSetProperties(destination, gifSettings as CFDictionary) for image in images { if let imageRef = image.cgImage { CGImageDestinationAddImage(destination, imageRef, imageSettings as CFDictionary) } } if !CGImageDestinationFinalize(destination) { finished?(false, nil); return } else { finished?(true, path) } } } My adaptation of the above code for APNGs (doesn't work; outputs empty file): func generateAPNG(images: [UIImage], delay: Float, count: Int = 0) { let apngSettings = [kCGImagePropertyPNGDictionary as String : [kCGImagePropertyAPNGLoopCount as String : count]] let imageSettings = [kCGImagePropertyPNGDictionary as String : [kCGImagePropertyAPNGDelayTime as String : delay]] guard let destination = CGImageDestinationCreateWithURL(outputURL as CFURL, UTType.png.identifier as CFString, images.count, nil) else { fatalError("Failed") } CGImageDestinationSetProperties(destination, apngSettings as CFDictionary) for image in images { if let imageRef = image.cgImage { CGImageDestinationAddImage(destination, imageRef, imageSettings as CFDictionary) } } }

As someone who learned Swift via SwiftUI, UIKit is completely alien to me, so I apologize if this is actually a very simple issue. I have a Messages extension that includes a sticker browser within it. In this extension, the MSMessagesAppViewController hosts a SwiftUI View, which in turn hosts a UIViewRepresentable version of MSStickerBrowserView. The whole Messages App sheet moves with an upward drag, and can switch to its expanded mode, whenever the browser is scrolled to the top (first sticker is at top left), but it doesn't budge when the browser is scrolled to the other end when it should allow the sheet to move upward with the drag. It seems something is reversed within the gesture priority management that allows a sheet to be moved in the appropriate direction when a contained scrollview is at the appropriate end. Things I've tried while reaching a diagnosis include: Limiting the presentation style to compact (the modal still moves, but never succeeds in changing) Adding competing highPriorityGestures in the SwiftUI view, set at various locations Inserting a rectangle with allowsHitTesting(false) beneath the browser Changing firstResponder statuses for all relevant views Changing GestureResponder priorities (there are no gesture responders in all views examined) Things I've considered but don't have the technical skills to implement: Have the view scroll a little downwards programmatically (like what can be done via ScrollViewReader in SwiftUI), but I have no idea how this can be done via MSStickerBrowserView or UIKit in general. Maybe the MSStickerBrowserView thinks its always in the expanded state (when the sheet is expanded, the end-drags work fine). If this is the case, if there's a way to either fix this misconception (via controller's didTransition) or do away with end drags in general, the problem should go away. Any pointers would be greatly appreciated!

A follow-up to Scrolling sticker browser on a Messages App sheet causes sheet to move, re-formulated and posted here after distilling the issue ScrollView behaves as though the Sheet is constantly expanded and transfers the drag gesture to the Sheet when scrolled to the top (i.e. when first displayed), causing the user to move the Sheet and not the ScrollView when attempting to scroll up or down. If this should be filed as a bug, let me know. Notes The problem doesn't exist if the sheet has only one detent, but since Messages App Extensions must be adjustable in phone portrait, this does nothing for me Adding a Rectangle with hitTesting disabled doesn't solve the issue Adding competing high priority DragGestures doesn't fix it One partial solution is having ScrollViewReader scroll down a tiny bit upon appearing, but the issue re-emerges after the user has scrolled to the top. Code to reproduce: struct Playground: View { @State private var detent = PresentationDetent.fraction(1/3) @State private var isSheetPresented = true var body: some View { Rectangle() .fill(Color(.systemGray5)) .sheet(isPresented: $isSheetPresented) { VStack { Text("ScrollView-in-Sheet Experiment") .padding() ScrollView { ScrollViewReader { scrollProxy in VStack(spacing: 0) { ForEach(0...10, id: \.self) { i in Rectangle() .fill(.white) .frame(height: 50) .id(i) .overlay { Text(i.description) } } } } } .frame(height: 200) .padding() } .background { Color(.systemGray6) } .presentationDetents([.large, .fraction(1/3)], selection: $detent) } } }

If two iOS/iPadOS devices have your app opened, is it possible to have the apps send data to each other over a wired connection? E.g. If two iPhone 15s are connected by USB-C, can I get my app in iPhone A to send data to iPhone B and vice-versa? I've been looking around for quite a while now and at this point I just want to know if it's technically feasible.

I'm new to Networking, so forgive me if this is a silly question: In the sample code, Building a custom peer-to-peer protocol, TLS is configured as follows: // Create TLS options using a passcode to derive a pre-shared key. private static func tlsOptions(passcode: String) -> NWProtocolTLS.Options { let tlsOptions = NWProtocolTLS.Options() let authenticationKey = SymmetricKey(data: passcode.data(using: .utf8)!) var authenticationCode = HMAC<SHA256>.authenticationCode(for: "TicTacToe".data(using: .utf8)!, using: authenticationKey) let authenticationDispatchData = withUnsafeBytes(of: &authenticationCode) { (ptr: UnsafeRawBufferPointer) in DispatchData(bytes: ptr) } sec_protocol_options_add_pre_shared_key(tlsOptions.securityProtocolOptions, authenticationDispatchData as __DispatchData, stringToDispatchData("TicTacToe")! as __DispatchData) sec_protocol_options_append_tls_ciphersuite(tlsOptions.securityProtocolOptions, tls_ciphersuite_t(rawValue: TLS_PSK_WITH_AES_128_GCM_SHA256)!) return tlsOptions } The sample code touts the connection as secure ("...uses Bonjour and TLS to establish secure connections between nearby devices"), but to my untrained eye it doesn't seem so. My reasoning is as follows: If I adapt this code as-is, so connections between two instances of my app use SymmetricKeys derived from the four-digit passcode, then wouldn't my encryption be easy to break by an adversary who sends 0000...9999 and records corresponding changes in the encryption, exposing my app to all sorts of attacks? The sample uses the passcode to validate the connection (host user shows client user the passcode, which is manually entered), which is a feature I would like to keep in some form or another, which is why this is causing so many headaches. Generally speaking, is there a way to secure a local peer-to-peer connection over Network.framework that doesn't involve certificates? If certificates are the only way, are there good resources you can recommend?