We are building a hybrid iOS app using Angular (web) rendered inside a WKWebView, hosted by a native Swift app. Communication between the Angular UI and native Swift code is done using WKScriptMessageHandler. The app mostly works without issues, but in rare edge cases, we’re seeing crashes on the main thread, and the crash is reported in Firebase Crashlytics. The root cause appears related to CFRelease and WKScriptMessageHandler. Here’s the relevant crash stack: Crashed: com.apple.main-thread 0 CoreFoundation 0xbfac CFRelease + 44 1 CoreFoundation 0xa734 __CFURLDeallocate + 128 2 CoreFoundation 0x730c _CFRelease + 292 3 libobjc.A.dylib 0x4e28 AutoreleasePoolPage::releaseUntil(objc_object**) + 204 4 libobjc.A.dylib 0x4cbc objc_autoreleasePoolPop + 260 5 WebKit 0x99f194 WebKit::WebUserContentControllerProxy::didPostMessage(WTF::ObjectIdentifierGeneric<WebKit::WebPageProxyIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>, WebKit::FrameInfoData&&, WTF::ObjectIdentifierGeneric<WebKit::ScriptMessageHandlerIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>, std::__1::span<unsigned char const, 18446744073709551615ul>, WTF::CompletionHandler<void (std::__1::span<unsigned char const, 18446744073709551615ul>, WTF::String const&)>&&) + 680 6 WebKit 0x1b358 WebKit::WebUserContentControllerProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 392 7 WebKit 0xe86b0 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 272 8 WebKit 0x23c0c WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 44 9 WebKit 0xe3f054 IPC::Connection::dispatchMessage(WTF::UniqueRef<IPC::Decoder>) + 252 10 WebKit 0x332d4 IPC::Connection::dispatchIncomingMessages() + 744 11 JavaScriptCore 0x58a7c WTF::RunLoop::performWork() + 204 12 JavaScriptCore 0x599a4 WTF::RunLoop::performWork(void*) + 36 13 CoreFoundation 0x56328 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 14 CoreFoundation 0x562bc __CFRunLoopDoSource0 + 176 15 CoreFoundation 0x53dc0 __CFRunLoopDoSources0 + 244 16 CoreFoundation 0x52fbc __CFRunLoopRun + 840 17 CoreFoundation 0x52830 CFRunLoopRunSpecific + 588 18 GraphicsServices 0x11c4 GSEventRunModal + 164 19 UIKitCore 0x3d2eb0 -[UIApplication _run] + 816 20 UIKitCore 0x4815b4 UIApplicationMain + 340 21 APP1 0xa2f80 main + 21 (AppDelegate.swift:21) 22 ??? 0x1c234eec8 (シンボルが不足しています) Steps: WebView: WKWebView Message passing: WKScriptMessageHandler → passing data from Angular → Swift WKWebView is long-lived and reused Native is using WKUserContentController.add(_:name:) to register handlers Crashes are intermittent (hard to reproduce), but often follow: Screen sleep/wake Push notification open Angular calling native immediately after resume Questions: Has anyone seen this specific crash pattern involving CFRelease and WKScriptMessageHandler? Are there known WebKit or CoreFoundation bugs related to WKScriptMessageHandler and retained URLs or message content? Thank you for your help!

Environment→ ・Device: iPad 10th generation ・OS：**iOS18.3.2 We're using AVAudioPlayer to play a sound when a button is tapped. In our use case, this button can be tapped very frequently — roughly every 0.1 to 0.2 seconds. Each tap triggers the following function: var audioPlayer: AVAudioPlayer? func soundPlay(resource: String, type: String){ guard let path = Bundle.main.path(forResource: resource, ofType: type) else { return } do { audioPlayer = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: path)) audioPlayer!.delegate = self try audioSession.setCategory(.playback) } catch { return } self.audioPlayer!.play() } The issue is that under high-frequency tapping (especially around 0.1–0.15s intervals), the app occasionally crashes. The crash does not occur every time, but it happens randomly — sometimes within 30 seconds, within 1 minute, or even 3 minutes of continuous tapping. Interestingly, adding a delay of 0.2 seconds between button taps seems to prevent the crash entirely. Delays shorter than 0.2 seconds (e.g.,0.15s,0.18s) still result in occasional crashes. My questions are: **Is this expected behavior from AVAudioPlayer or AVAudioSession? Could this be a known issue or a limitation in AVFoundation? Is there any documentation or guidance on handling frequent sound playback safely?** Any insights or recommendations on how to handle rapid, repeated audio playback more reliably would be appreciated.

Environment→ ・Device: iPad 10th generation ・OS：**iOS18.3.2 I'm using AVAudioSession to record sound in my application. But I recently came to realize that when the app starts a recording session on a tablet, OS automatically sets the tablet volume to 50% and when after recording ends, it doesn't change back to the previous volume level before starting the recording. So I would like to know whether this is an OS default behavior or a bug? If it's a default behavior, I much appreciate if I can get a link to the documentation.

Description When you try to open an iOS app using Universal links from another app while the opening app is being updating, Safari will open an error screen(app will not launch). Is this a specification of universal links on iOS? Also is it possible for the Main app to detect that the application trying to open Universal Link is being updating? Devices iPad 9thGen/10thGen

I'm developing two native apps and one is a authentication app and other one is business app. In the main flow if buisness application is on the foreground and did nothing for at least 10 minutes it will automatically time out and redirect to the autentication app for token refresh. In this flow universal link redirect to the authetication app without opening Safari. But if i execute the below flow buissness app redirect to the Safari. Buisness App In Foregorund → Displaying a OS screen while app is in Foreground(Like Push Notification Center) → On this satate leave device for 10 minutes → Buisness app will automatically timeout and rediret to Safari(In safari 「NoSuchKey The specified key does not exist.」message is displaying but authentication app Universal link Start button is showing) → After click the Universal Link start button in Safari Authentication App open. I use the below code to start the Universal Link: if let url = URL(string: path) { UIApplication.shared.open(url) } So i would like to know is there a special reason that when Displaying a OS screen while app is in Foreground(Like Push Notification Center) affect the normal flow of Universal redirection to another app?

I'm trying to handle the error in NEHotspotConfigurationManager connection method.When i try even OS network connect dialog showing with "Cannot connect" response return as "Success". In my flow i'm trying to connect to a private network. First i connect using below code and then set the IP Address,SubNetMask,Router and DNS server address manually to already added Wifi by running below code. I'm doing this manually because as i understand you cannot set the IP Address,SubNetMask,Router and DNS server address using Swift. https://forums.developer.apple.com/forums/thread/96834?page=2 I read the above thread and what i can understand from that is it's a bug in the os method. So does this problem fixed on latest iOS version? or is there a way to handle this problem? Error handler code→ let eapSetting = NEHotspotEAPSettings() eapSetting.username = self.username eapSetting.password = self.password eapSetting.supportedEAPTypes = [NEHotspotEAPSettings.EAPType.EAPPEAP.rawValue as NSNumber] eapSetting.trustedServerNames = ["ABC"] NEHotspotConfigurationManager.shared.removeConfiguration(forSSID: self.ssid) let hotspotConfiguration = NEHotspotConfiguration(ssid: self.ssid, eapSettings: eapSetting) manager.apply(hotspotConfiguration){ (error) in if let error = error { print("Error") return } else { print("Success") return } }

Environment→ ・Device: iPad 9th generation ・OS：**iOS17.5.1 ・Printer model：EPSON PX-S730 Current issues→ 01). After canceling a print job in the Print Center, the Print Center screen on the iPad does not close. 02). When the printer is turned on and a new print job is sent, the Print Center shows the ongoing waiting job instead of proceeding with printing. Problem Description→ The AirPrint feature on an iPad 9th generation running iOS 17.5.1 is being used with an EPSON PX-S730 printer. When sending a print job while the printer is off, the Print Center shows the ongoing printing job. If the print job is canceled in the Print Center, the Print Center screen on the iPad does not close. After turning on the printer and sending the print job again, the Print Center shows the ongoing waiting job. What I want→ The Print Center screen on the iPad to close automatically after canceling a print job. Test code: Note: printController.print response is completed but Print Center status is waiting let printInfo = UIPrintInfo(dictionary: nil) printInfo.jobName = "Print Job" printController.printInfo = printInfo let pdfURL = Bundle.main.url(forResource: "sample", withExtension: "pdf")! printController.printingItem = pdfURL let printer = UIPrinter(url: printerUrl) printController.print(to: printer, completionHandler: { [self] printController, completed, error in if(error != nil){ print("error"). }else if completed{ print("completed") //this scenario handles completion response }else{ print("cancel") } })

Environment→ ・Device: iPad 9th generation ・OS：**iOS17.5.1 ・Printer model：EPSON PX-S730 Current issues→ An error message is not returned from the printer if a print job is sent while the printer is off. Problem Description→ The AirPrint feature on an iPad 9th generation running iOS 17.5.1 is being used with an EPSON PX-S730 printer. When sending a print job while the printer is off, the Print Center shows the ongoing printing job, but the printing cannot be executed because the printer is off. What I want→ I would like an error to be returned when I submit a printing job while the printer is off. Test code: Note: printController.print response is completed but Print Center status is printing let printInfo = UIPrintInfo(dictionary: nil) printInfo.jobName = "Print Job" printController.printInfo = printInfo let pdfURL = Bundle.main.url(forResource: "sample", withExtension: "pdf")! printController.printingItem = pdfURL let printer = UIPrinter(url: printerUrl) printController.print(to: printer, completionHandler: { [self] printController, completed, error in if(error != nil){ print("error"). }else if completed{ print("completed"). //this scenario handles completion response }else{ print("cancel") } })

I’m creating a hybrid app using Swift and Angular. Angular content is loading on top of the Native Swift WkWebView. Starting from iPad 10th generation only in the app initial launch header area become invisible(invisible means header text becomes white). But once I send the app to background and return to foreground header text becomes black and it will show without problem. I would really like to know whether this is a OS problem and if so is there any pro-grammatical solution for this? if anyone can guide me to proper way fix this much a appreciated!!! Environment: ・Device: iPad 10th generation ・OS：iPad OS 17.3.1 ・Native App : Swift 5

Environment→ ・Device: iPad 9th generation ・OS：iPadOS17.1、iPadOS16.6 ・Printer model：EPSON PX-S730 What I want→ I want to determine whether the printer and iPad are connected to the same Wi-Fi network. Current issues→ When I run the below code on an iOS17 iPad, contactPrinter() becomes true even though you are not connected to the same network as the printer. Problem Description→ I want to pass the URL of the printer that I have set in advance and print directly from the device to the printer. So in iOS 16 when i execute the below code, without connecting to the same network as printer, return value of the "contactPrinter" method is FALSE. once i update to iOS 17 and ran the same code with the same conditions(iPad and printer not connected to same network), return value becomes TRUE. [I'm using "contactPrinter" method because after update to iOS 17 i was able to successfully launch a print job even if your device isn't connected to the same network as your printer.But in iOS 16 it return as an Error.] Is this a bug in iOS 17? Or is the method used incorrectly? Test code: let printer = UIPrinter(url: URL(string: "printer url")!) printer.contactPrinter { (available) -> Void in if (available) { // iOS17.1:true, iOS16.6:false print("connected to printer") printController.print(to: printer, completionHandler: printCompletionHandler) } else { print("not connected to printer") } }

Environment→ ・Device: iPad 9th generation ・OS：**iOS17.0.3 ・Printer model：EPSON PX-S730 What I want→ I would like to return an error when I submit a printing job, if the printer is not properly connected to the same WIFI as iPad(iOS17). Current issues→ When I run the below code in iOS17, I was able to successfully submit a print job to printer and, printer returns completed(true) as the result. In iOS16 print job return as an error to the same below code. Problem Description→ In iOS 16.6.1 when you know the correct printer access URL and submit a print job without connecting to the same WIFI as the printer, job return as an error.(return to the error code segment in the below code) But after I updated the app to iOS 17.0.3 and run the same job, it's not returning as an error.(it returns to the completed block in the below code segment and completed Boolean value is true. ) When you check the "Print Summary" window in iPad, the status of the print job is Waiting. So I would like to handle this process in the same way like iOS16 in iOS17. I would like to Print Job to return as a error when printer and iPad not connected to same WIFI(error like "cannot connect to the printer") Test code: let printInfo = UIPrintInfo(dictionary: nil) printInfo.jobName = "Print Job" printController.printInfo = printInfo let pdfURL = Bundle.main.url(forResource: "sample", withExtension: "pdf")! printController.printingItem = pdfURL let printer = UIPrinter(url: printerUrl) printController.print(to: printer, completionHandler: { [self] printController, completed, error in if(error != nil){ print("error") }else if completed{ print("completed") }else{ print("cancel") } }) Does anyone knows if it's a bug in iOS17 or am I missing something?

Environment→ ・Device: iPad 9th generation ・OS: iOS17.0.3 ・Printer model: EPSON PX-S730 What I want→ I would like to programmatically use the AirPrint API to directly print from my application to a selected printer specifying the printing as single-side Current issues → After updating the iOS from 16.6.1 to 17 version, when printing programmatically using the AirPrint API, even setting the print options as single-side, it end up printing on double- side. Issue description→ When I run the code below on iOS16.6.1, it prints on single-side,** but after updating to iOS17.0.3, It’s always printing on double-sides.** Also, the Apple Developer Documentation says that the print method disables duplex printing and it's describe in below URL: https://developer.apple.com/documentation/uikit/uiprintinteractioncontroller/1618174-print Test code: let printInfo = UIPrintInfo(dictionary: nil) printInfo.jobName = "Print Job" printController.printInfo = printInfo let pdfURL = Bundle.main.url(forResource: "sample", withExtension: "pdf")! printController.printingItem = pdfURL let printer = UIPrinter(url: printerUrl) printController.print(to: printer, completionHandler: { [self] printController, completed, error in if(error != nil){ print("error") }else if completed{ print("completed") }else{ print("cancel") } }) Does anyone knows if it's a bug in iOS17 or am I missing something?

I want to use the AirPrint API, which is a standard OS printing function, programmatically on an iOS application to print directly to a printer by specifying single-sided printing instead of double-sided printing for the first print after the OS is initialised. 〇Verification environment ・Device: iPad 9 generation ・OS：OS16.6 ・Printer model: EPSON PX-S730 / Brother MFC-J7300CDW / Canon G5030 / EPSON PX-M791FT ※All printers used for verification support AirPrint and are capable of duplex printing. 〇Issue The duplex printing option can be specified from the program using the AirPrint API property "duplex", However, when printing is executed from the program, the specified print option "duplex printing" is not reflected in the AirPrint API. 〇Verification results Installed the developed print verification app on the device in factory default state, and executed the print process from the app to the printer. (1st time) Set the property "duplex printing" = duplex or single-sided in the AirPrint API of iOS → In both cases, printing was performed on both sides. (2nd and subsequent times) Set the property "duplex printing" = duplex or single-sided in the AirPrint API of iOS → In both cases, printing is done on one side. 〇Source Code The print verification application we developed uses the UIPrintInteractionController class in Swift to specify the printing options for duplex printing. We believe we can specify this by setting "info.duplex = UIPrintInfo.Duplex.none" in the following source code and adding it to printInfo. func buttonClick(_ sender: Any) { let printController = UIPrintInteractionController.shared let printInfo = UIPrintInfo(dictionary: nil) printInfo.jobName = "PrintJob from PrintTestApp" // color printInfo.outputType = UIPrintInfo.OutputType.general // duplex mode for the print printInfo.duplex = UIPrintInfo.Duplex.none // set the single side option printController.printInfo = printInfo // PDF printing in project folder printController.printingItem = Bundle.main.url(forResource: "sample", withExtension: "pdf")! // printer settings let printer = UIPrinter(url: URL(string: "ipps://XXXXXXX/ipp/print")!) // direct printing printController.print(to: printer, completionHandler: { controller, completed, error in guard error == nil else { return } }) }

I'm using UIPrintInteractionController(AirPrint) to print documents in my swift application. I was able to print the documents using my application, but all of them are printing in one-sided. Now i want to add a double-sided printing as an option to my application. After some research i found that it can be implement by adding info.duplex = UIPrintInfo.Duplex.longEdge to printInfo. I tried it using the below code. private var printController = UIPrintInteractionController.shared let info = UIPrintInfo.printInfo() info.duplex = UIPrintInfo.Duplex.longEdge <<<<<< info.jobName = "XXXPrint" info.orientation = .portrait printController.printInfo = info printController.print(to: printer, completionHandler: { [self] controller, completed, error in if(error != nil){ print("successfully") }else{ print("Printing error: \(error.localizedDescription)") } } But whether i set it in the code and run my application it is printing the pages by one-sided. So if some one can guide me to double-sided printing workable solution highly appreciated!!

I want to connect to Wi-Fi programmatically using swift in my iPad application and I want to create according to bellow flow. Enter the network name programmatically Set the programmatically "WAP2-Enterprise" for security. Set username/password. A certificate popup will appear, so tap "Trust". "Turn on the following information." otherwise off. Automatic connection Restrict IP address tracking Set the programmatically IPV4 address below. Configure ID: Manual IP address: 192.XXX.XXX.XXX For tablets, ○○: 1 to 20 Subnet mask: 255.255.255.0 Router: 192.XXX.XXX.XXX Configure DNS server(Set the programmatically) Manual Add server: 8.8.8.8 HTTP proxy(Set the programmatically) Configure proxy: off if anyone you can guide me to proper way much a appreciated!!!