Hi Everyone, I’m working on a communication system for my app using NWConnection with the UDP protocol. The connection is registered to a custom serial dispatch queue. However, I’m trying to understand what the behavior will be in a scenario where the connection is canceled while there are still pending receive operations in progress. Scenario Overview: The sender is transmitting n = 100 packets to the receiver, out of which 40 packets have already been sent (i.e., delivered to the Receiver). The receiver has posted m = 20 pending receive operations, where each receive operation is responsible for handling one packet. The receiver has already successfully processed x = 10 packets. At the time of cancellation, the receiver’s buffer still holds m = 20 packets that are pending for processing, and k = 10 pending receive callbacks are in the dispatch queue, waiting to be executed. At same time when the 10th packet was processed another thread triggers .cancel() on this accepted NWConnection (on the receiver side), I need to understand the impact on the pending receive operations and their associated callbacks. My Questions: What happens to the k = 10 pending receive callbacks that are in the dispatch queue waiting to be triggered when the connection is canceled? Will these callbacks complete successfully and process the data? Or, because the connection is canceled, will they complete with failure? What happens to the remaining pending receive operations that were initiated but have not yet been scheduled in the dispatch queue? For the pending receive operations that were already initiated (i.e., the network stack is waiting to receive the data, but the callback hasn’t been scheduled yet), will they fail immediately when the connection is canceled? Or is there any chance that the framework might still process these receives before the cancellation fully takes effect?

We have a requirement to create a production quality application that also acts as HTTPS server for certain communication. The preference is for the server to support HTTP/1.1, HTTP/2 and HTTP/3 communication asynchronously, though not mandatory to support all the HTTP versions. Wanted to get the guidance, on which stack should be used, that is most reliable and that gives the maximum long term compatibility, sustainability and reliability. What is the recommended 'in-built' or 'available by default' stack on Apple Platform ? For HTTPS on HTTP/1.1 with synchronous mode operations ? For HTTPS on HTTP/1.1 with asynchronous mode operations ? For HTTPS on HTTP/2 with synchronous mode operations ? For HTTPS on HTTP/2 with asynchronous mode operations ? For HTTPS on HTTP/3 with asynchronous mode operations ? For HTTPS on HTTP/1.1 + HTTP/2 with synchronous mode operations ? For HTTPS on HTTP/1.1 + HTTP/2 with asynchronous mode operations ? For HTTPS on HTTP/1.1 + HTTP/2 + HTTP/3 with asynchronous mode operations ? What the generally recommended server stack that a typical application uses whether 'in-built' or 'available by default on Apple ' or 'not-available by default on Apple' stack. From the available stacks , we tried to evaluate the below stacks: https://opensource.apple.com/projects/swiftnio/ : We understand that while it’s not preinstalled as part of Apple's OSes, it is an official Swift package supported by Apple and can easily be added to your project. At the moment it supports HTTP/1.1 and HTTP/2. The link https://github.com/apple/swift-nio/issues/1730says that HTTP/3 will get added in the future. Is there any other HTTPS stack (built-in or third-party) that is recommended to the used on Apple's platform ? Our application is expected to be working on macOS, iOS, iPadOS, tvOS and watchOS. We understand that macOS also includes Apache HTTPD server. As our application is not primarily a Web Server (and also supports other protocols both in client and server mode), it looks integrating HTTPS directly into the application using a lightweight HTTP library with SSL/TLS support is a better option, in place of Apache HTTPD. From the document we know that swift-nio uses BoringSSL (swift-nio-ssl) which is prepackaged along with the swift-nio library, and it does not use the default Secure Transport. What is the reason being not using Secure Transport ? Now does it become the responsibility of the application using swift-nio to take care of updating BoringSSL with the patches.

Is there any callback available when a/all notifications is/are removed from notification tray?

Hi team at Apple, here is a scenario we came across: The order of priority of payment methods in Apple Wallet follows: Credit Debit Apple Cash Our app displays a payment sheet that excludes credit cards. Instead of a debit card, the default payment option shown to the user on the payment sheet is Apple Cash. Is this a known issue or have we configured something wrong in our end?

Is there any way I can get updates when I change CarPlay style settings? I've tried CPSessionConfigurationDelegate.contentStyleChanged and CPTemplateApplicationSceneDelegate.contentStyleDidChange, but they always produce the same result. When I choose: Automatic -> I receive light in case of daylight; Always Dark and Always Show Dark Map toggle on -> dark Always Dark and Always Show Dark Map toggle off -> light. But it seems to be wrong, b/c CarPlay's toolbar is still dark, and I receive light. Is there a way to get a dark style when choosing Always Dark and Always Show Dark Map toggle off? Or at least get updates when the Always Show Dark Map toggle changes?

Hi, I'm working on a game for the past few years using first Unreal Engine 4, and now Unreal Engine 5.4.4. I'm experiencingan unusual crash on startup on some devices . The crash is so fast that I'm barely able to see the launching screen sometimes because the app closes itself before that. I got a EXC_CRASH (SIGABRT) so I know that it's a null pointer reference, but I can't quite wrap my head about the cause, I think that's something messed up in the packaging of the app, but here is where I'm blocked, I'm not that accustomed with apple devices. If someone has some advise to give, please, any help will be very valuable. Many thanks. Log : Crash Log on Ipad

We built a time verification feature as part of our iPadOS/iOS app where recording an accurate timestamp is part of a core feature of ours. We want to maintain integrity of recorded data, but our app must still be able to operate offline. To accomplish this, we established a baseline between the device's internal clock (CLOCK_MONOTONIC_RAW) and our servers via an initial network request. Once that baseline is established, we can reliably calculate the true time, or detect when a user may have tampered their device's time, especially while offline. Of course, this baseline falls apart after the device reboots. We have been using kern.bootsessionuuid locally to detect when a device has rebooted so we know to wipe the baseline and try to establish a new one. Unfortunately (I'm sure due to issues with device fingerprinting), Apple has removed access to kern.bootsessionuuid in iOS 18, silently and without warning. This has compromised the integrity of our feature. https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-18-release-notes#Deprecations Is there any other way that our app can detect or be notified that a device reboot has occurred? Alternatively, Google has just provided a "TrustedTime" API that looks to do the heavy lifting for what we have been solving ourselves. Would it be possible for Apple to provide a similar API? https://android-developers.googleblog.com/2025/02/trustedtime-api-introducing-reliable-approach-to-time-keeping-for-apps.html We would appreciate any guidance here. Thanks!

When I set the option parameter to OSLogEnumeratorReverse, the iteration order of OSLogEnumerator is still from front to back in time When I set the options parameter to 0 and the position parameter to the first 5 seconds of the current time, OSLogEnumerator can still iterate over the previous 5 seconds #import "ViewController.h" #import <OSLog/OSLog.h> @interface ViewController () @property(strong, nonatomic)OSLogStore *logStore; @property(strong, nonatomic)NSDateFormatter *formatter; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSError *err = nil; self.logStore = [OSLogStore storeWithScope:OSLogStoreCurrentProcessIdentifier error:&err]; if (!self.logStore || err) { NSLog(@"error: %@", err); NSAssert(0, @""); } self.formatter = [[NSDateFormatter alloc] init]; [self.formatter setDateFormat:@"[yyyy-MM-dd HH:mm:ss:SSS]"]; } - (IBAction)addLog:(id)sender { static int i = 0; NSLog(@"[test] %@ this is a log with index:%d", [self.formatter stringFromDate:[NSDate date]], i++); } - (IBAction)printLogWithReverse:(id)sender { NSError *err = nil; NSPredicate *preeicate = [NSPredicate predicateWithFormat:@"composedMessage contains %@" argumentArray:@[@"[test]"]]; OSLogEnumerator *enumer = [self.logStore entriesEnumeratorWithOptions:OSLogEnumeratorReverse position:nil predicate:preeicate error:&err]; if (err) { NSLog(@"enumer error:%@", err); NSAssert(0, @""); } OSLogEntryLog *entry = nil; while (entry = [enumer nextObject]) { NSString *message = [entry composedMessage]; printf("log: %s\n", message.UTF8String); } } - (IBAction)printLogWithPosition:(id)sender { NSError *err = nil; NSPredicate *preeicate = [NSPredicate predicateWithFormat:@"composedMessage contains %@" argumentArray:@[@"[test]"]]; NSDate *posDate = [NSDate dateWithTimeIntervalSinceNow:-5]; OSLogPosition *pos = [self.logStore positionWithDate:posDate]; OSLogEnumerator *enumer = [self.logStore entriesEnumeratorWithOptions:0 position:pos predicate:preeicate error:&err]; if (err) { NSLog(@"enumer error:%@", err); NSAssert(0, @""); } const char *now = [self.formatter stringFromDate:[NSDate date]].UTF8String; const char *posStart = [self.formatter stringFromDate:posDate].UTF8String; OSLogEntryLog *entry = nil; while (entry = [enumer nextObject]) { NSString *message = [entry composedMessage]; printf("log(now:%s, pos:%s): %s\n", now, posStart, message.UTF8String); } } @end The method of - (IBAction)printLogWithReverse:(id)sender print result not reversed by time. log: [test] [2025-02-18 17:35:50:175] this is a log with index:0 log: [test] [2025-02-18 17:35:51:040] this is a log with index:1 log: [test] [2025-02-18 17:35:51:174] this is a log with index:2 log: [test] [2025-02-18 17:35:51:323] this is a log with index:3 log: [test] [2025-02-18 17:35:51:473] this is a log with index:4 log: [test] [2025-02-18 17:35:51:640] this is a log with index:5 log: [test] [2025-02-18 17:35:51:773] this is a log with index:6 log: [test] [2025-02-18 17:35:51:923] this is a log with index:7 The method of - (IBAction)printLogWithPosition:(id) print result should not contain the log from 5 seconds ago because I set the start time position in the position argument [test] [2025-02-18 17:43:58:741] this is a log with index:0 [test] [2025-02-18 17:43:58:940] this is a log with index:1 [test] [2025-02-18 17:43:59:458] this is a log with index:2 [test] [2025-02-18 17:43:59:923] this is a log with index:3 log(now:[2025-02-18 17:44:51:132], pos:[2025-02-18 17:44:46:032]): [test] [2025-02-18 17:43:58:741] this is a log with index:0 log(now:[2025-02-18 17:44:51:132], pos:[2025-02-18 17:44:46:032]): [test] [2025-02-18 17:43:58:940] this is a log with index:1 log(now:[2025-02-18 17:44:51:132], pos:[2025-02-18 17:44:46:032]): [test] [2025-02-18 17:43:59:458] this is a log with index:2 log(now:[2025-02-18 17:44:51:132], pos:[2025-02-18 17:44:46:032]): [test] [2025-02-18 17:43:59:923] this is a log with index:3

Does iOS provide a callback when a notification is manually removed from the notification tray ?

We have a case when we send 8 push notifications more or less simultaneously over 1 HTTP 2.0 connection. Using .NET Core 8 Sometimes some of them fail with a strange message: System.Net.Http.HttpRequestException: The response ended prematurely while waiting for the next frame from the server. (ResponseEnded) ---> System.Net.Http.HttpIOException: The response ended prematurely while waiting for the next frame from the server. (ResponseEnded) at System.Net.Http.Http2Connection.ThrowRequestAborted(Exception innerException) at System.Net.Http.Http2Connection.Http2Stream.TryEnsureHeaders() at System.Net.Http.Http2Connection.Http2Stream.ReadResponseHeadersAsync(CancellationToken cancellationToken) at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) --- End of inner exception stack trace --- at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken) at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) at Microsoft.Extensions.Http.Logging.HttpClientLoggerHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) We noticed that failure is always accompanied with a huge delay (~500ms) comparing to success (~20ms). Also some of the burst messages are sent successfully (sometimes 2-4 of them) What can we do about it?

Hello We are developers of a long-running game series and now reports have started to come in that users who install any of our previous games from the Mac App Store on OS X Sequoia are shown a popup claiming "The exit(173) API is no longer available". It's actually a lie, the mechanism is still there, the receipt generation still works and the game still runs afterwards. But the popup is confusing to users therefore we need to update the code. Apparently the replacement for the old receipt generation mechanism is AppTransaction which does not exist for Objective C. We have attempted to use it using the Swift/ObjC interoperability and failed so far. The problem is that we need to call async methods in AppTransaction and all our attempts to make this work have failed so far. It seems as the actor/@MainActor concept is not supported by Swift/ObjC interoperability and without those concepts we don't know how to pass results from the async context to the callers from ObjC. The lack of usable information and code online regarding this topic is highly frustrating. Apple really needs to provide better support for developers if they want us to continue to support the Mac platform with high quality games and applications on the Mac App Store. We would appreciate if anyone can cook up a working sample code how to use AppTransaction in ObjC. Thanks in advance!

Hello, We are developing a multimedia routing platform written in Rust and uses gstreamer 1.20. We are targeting running on Mac Minis (older intel and newer M1/2/3/... w/ 8GB ram) using macOS 14.6.1 I have profiled memory usage using XCode instruments with the allocation tool, stack and heap memory is very stable once the pipelines are up and running. There are between 50 to 100 incoming RTSP streams with multiple webrtc connections, so lots of network and memory bandwidth is being used. However, we eventually see real memory usage increasing in Activity Monitor along with memory pressure increasing, but the heap/stack usage is constant in instruments, so we do not understand this behavior. Page fragmentation is a possibility, but have not been able to prove this with instruments. Please see attached image.You can see that 10-minute run had a total of approx 4.3 GB of allocations, but only 50.17MB persistent. Eventually we see kernel panics in either userspace watchdog timeout: no successful checkins from WindowServer (2 induced crashes) in 120 second or apcie[2:lan-1gb]::handleCompletionTimeoutInterrupt: completion timeout which I believe are caused by high system load and the kernel becoming unresponsive while the kernel is doing page compressions. We tested running with je-malloc for a while, but the kernel panics still occur. We have multiple kernel panic recordings available, but they are too large to upload here. We are also having multiple kernel panics per day while running this application. Any suggestions on how to prevent these kernel panics? If the system is out of memory, shouldn't our application crash with an out-of-memory and the kernel should NOT panic? Thanks, Jeremy Prater

Please help! I have a subscription IAP failing on tvOS 18.2 at: func makePurchase(_ product: Product) async throws { let result = try await product.purchase() //ERROR OCCURS HERE (See error message below) ... Xcode Console message: "Could not get confirmation scene ID for [insert my IAP id here]" The IAP subscription was working fine on 18.1 and earlier, and the same IAP and code is also running fine on iOS 18.2. The tvOS error on 18.2 happens both in production and sandbox. Are there any changes to StoreKit 2 which might cause this error?

I am creating a voip app, I am trying to use call kit to answer calls, however audio doesn't seem to work when using callKit when looking at the systems logs I see no server connection when checking background audio state, won't allow background audio! background audio processAllowed = 0 for displayID com.apple.TelephonyUtilities no server connection when checking background audio state, won't allow background audio! background audio processAllowed = 0 for displayID {my app id} I have the plist entries for background ui modes for voip, audio, fetch and background notifications along with the backgrounds modes for Voip, Audio, AirPlay, and Picture in Picture, Background notifications. I am unsure what to do about this, like my reading of the error is I can't use audio cause I am not connected to a server, but like is it any server, Am I suppose to connect to the voip call before setting up audio, I am not sure how to do that.

My question is simple, I do not have much experience in writing swift code, I am only doing it to create a small executable that I can call from my python application which completes Subcription Management. I was hoping someone with more experience could point out my flaws along with giving me tips on how to verify that the check is working for my applicaiton. Any inight is appreciated, thank you. import Foundation import StoreKit class SubscriptionValidator { static func getReceiptURL() -> URL? { guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL else { print("No receipt found.") return nil } return appStoreReceiptURL } static func validateReceipt() -> Bool { guard let receiptURL = getReceiptURL(), let receiptData = try? Data(contentsOf: receiptURL) else { print("Could not read receipt.") return false } let receiptString = receiptData.base64EncodedString() let validationResult = sendReceiptToApple(receiptString: receiptString) return validationResult } static func sendReceiptToApple(receiptString: String) -> Bool { let isSandbox = Bundle.main.appStoreReceiptURL?.lastPathComponent == "sandboxReceipt" let urlString = isSandbox ? "https://sandbox.itunes.apple.com/verifyReceipt" : "https://buy.itunes.apple.com/verifyReceipt" let url = URL(string: urlString)! let requestData: [String: Any] = [ "receipt-data": receiptString, "password": "0b7f88907b77443997838c72be52f5fc" ] guard let requestBody = try? JSONSerialization.data(withJSONObject: requestData) else { print("Error creating request body.") return false } var request = URLRequest(url: url) request.httpMethod = "POST" request.httpBody = requestBody request.setValue("application/json", forHTTPHeaderField: "Content-Type") let semaphore = DispatchSemaphore(value: 0) var isValid = false let task = URLSession.shared.dataTask(with: request) { data, response, error in guard let data = data, error == nil, let jsonResponse = try? JSONSerialization.jsonObject(with: data) as? [String: Any], let status = jsonResponse["status"] as? Int else { print("Receipt validation failed.") semaphore.signal() return } if status == 0, let receipt = jsonResponse["receipt"] as? [String: Any], let inApp = receipt["in_app"] as? [[String: Any]] { for purchase in inApp { if let expiresDateMS = purchase["expires_date_ms"] as? String, let expiresDate = Double(expiresDateMS) { let expiryDate = Date(timeIntervalSince1970: expiresDate / 1000.0) if expiryDate > Date() { isValid = true } } } } semaphore.signal() } task.resume() semaphore.wait() return isValid } }

For a component operating as a peripheral in a BLE connection, is it possible to tell if the user taps "Cancel" in the system's pairing request dialog? None of the methods in CBPeripheralManagerDelegate appear to apply.

Hello Apple Developer Team, Based on the mandate to update the APNs certificate by February 24, 2025 for certificate-based authentication, a question from the team has been brought up that maybe Apple or the community can help answer. Since our implementation uses token-based authentication, I’m seeking clarification on a couple of points: 1. Does the certificate update affect token-based connections at all? 2. What is the rationale behind updating certificates for certificate-based authentication, and are there any implications or benefits for developers using token-based authentication? Understanding these details will help us ensure our system remains compliant and optimally configured. Any guidance or further clarification you can provide would be greatly appreciated. Thank you!

Hello, I'm trying to display some Duration in a live activity using a custom format, with the goal of displaying a match time (only minutes) as, e.g. 33', 45' (+2), etc. For that purpose, I'm using a TimeDataSource&lt;Duration&gt;, so that it also updates automatically given a starting point. I've implemented my custom FormatStyle, trying to somehow mimic the existing UnitsFormatStyle (which perfectly works with live activities) but just changing the format. I've added conformance to DiscreteFormatStyle, and code-wise everything seems to be ok (if I've understood things correctly). It compiles and it even works as expected in a playground. However, when trying to use it within the live activity, I'm getting these cryptic errors in the Console.app, and the live activity just turns into a view with placeholders Failed to fetch view from archive at index 12: SwiftUI.AnyCodable&lt;SwiftUI.(unknown context at $1d47f6af0).SafelyCodableRequirement&gt;.(unknown context at $1d47fe410).Errors.noType(mangledName: "7SwiftUI18TimeDataFormattingO10ResolvableVy_AA0cD6SourceVAAE15DurationStorageOys0H0V_GAK28BlickLiveActivitiesExtensionE16MatchFormatStyleVG") [624AEC37-13D9-4927-9F41-C3092B61E214] Failed to return view entry from archive for view model with tag listItem with error: SwiftUI.AnyCodable&lt;SwiftUI.(unknown context at $1d47f6af0).SafelyCodableRequirement&gt;.(unknown context at $1d47fe410).Errors.noType(mangledName: "7SwiftUI18TimeDataFormattingO10ResolvableVy_AA0cD6SourceVAAE15DurationStorageOys0H0V_GAK28BlickLiveActivitiesExtensionE16MatchFormatStyleVG") Are there any limitations when it comes to live activities and these custom formatters? This whole error doesn't make sense, since I'm only aiming to update every minute, which should just be fine, the same thing I get with the UnitsFormatStyle. For reference, this is my playground, which just works as expected: import Foundation import SwiftUI import PlaygroundSupport extension Duration { struct MatchFormatStyle: DiscreteFormatStyle, Sendable { let periodLength: Int let overtime: Int func format(_ value: Duration) -&gt; String { let (seconds, _): (Int64, Int64) = value.components let minutes: Int = Int(seconds) / 60 let current: Int = periodLength + minutes + overtime if current &gt; periodLength { return "\(periodLength)' (+\(current - periodLength))" } else { return "\(current)'" } } func discreteInput(before input: Duration) -&gt; Duration? { let (seconds, _): (Int64, Int64) = input.components let minutes: Int64 = seconds / 60 - 1 return Duration(secondsComponent: minutes * 60, attosecondsComponent: .zero) } func discreteInput(after input: Duration) -&gt; Duration? { let (seconds, _): (Int64, Int64) = input.components let minutes: Int64 = seconds / 60 + 1 return Duration(secondsComponent: minutes * 60, attosecondsComponent: .zero) } } } extension FormatStyle where Self == Duration.MatchFormatStyle { static func matchTime(currentTime: Int, periodLength: Int) -&gt; Duration.MatchFormatStyle { return Duration.MatchFormatStyle(periodLength: periodLength, overtime: max(currentTime - periodLength, .zero)) } } extension TimeDataSource&lt;Date&gt; { static func matchDuration(for currentTime: Int, periodLength: Int) -&gt; TimeDataSource&lt;Duration&gt; { let minutesAhead: Double = Double(max(periodLength - currentTime + 1, .zero)) return TimeDataSource&lt;Date&gt;.durationOffset(to: Date.now.addingTimeInterval(minutesAhead * 60)) } } struct FooView: View { let currentTime: Int = 36 let periodLength: Int = 45 var body: some View { Text( TimeDataSource&lt;Date&gt;.matchDuration(for: currentTime, periodLength: periodLength), format: .matchTime(currentTime: currentTime, periodLength: periodLength) ) .frame(width: 400, height: 200) .font(.system(size: 50)) } } // Present the view controller in the Live View window PlaygroundPage.current.setLiveView(FooView()) Any hints or suggestions are welcome, many thanks in advance.

I have noticed that when I select the app token of the youtube app to be blocked via a ManagedSettingsStore, the youtube website is blocked as well (which is a good and intended behavior IMO). But how do I know in the ShieldConfigurationDataSource’s override func configuration(shielding webDomain: WebDomain, in category: ActivityCategory) -> ShieldConfiguration to which ManagedSettingsStore the WebDomain’s token is related? We use different ManagedSettingsStores for different block purposes, which differentiate in their ShieldConfiguration. Thanks a lot and have a great day!

I'm currently developing an app with mapkit which I may submit to the Swift Student Challenge. So anyways, the app will be used completely offline. I was wondering if there was any way to include very low resolution map tiles with the app files. That way, the app never needs wifi. However, I'm not sure if this is possible, especially since the map would need to be under 20 mb. Thanks.