Delve into the world of built-in app and system services available to developers. Discuss leveraging these services to enhance your app's functionality and user experience.

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NFCTagReaderSession host card emulation (HCE) exception
I'm trying to read a tag generated by my app that emulates event input tags; in my NFC reader app and I get this error: <NSXPCConnection: 0x300a108c0> connection to service with pid 62 named com.apple.nfcd.service.corenfc: Exception caught during decoding of received selector didDetectExternalReaderWithNotification:, dropping incoming message. Exception: Exception while decoding argument 0 (#2 of invocation): Exception: decodeObjectForKey: class "NFFieldNotificationECP1_0" not loaded or does not exist ( 0 CoreFoundation 0x0000000192b00f2c 76A3B198-3C09-323E-8359-0D4978E156F5 + 540460 1 libobjc.A.dylib 0x000000018a9a32b8 objc_exception_throw + 60 2 Foundation 0x0000000191932584 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 38276 3 Foundation 0x0000000191930d10 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 32016 4 Foundation 0x000000019198f460 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 418912 5 Foundation 0x000000019198c510 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 406800 6 Foundation 0x00000001919e4cf4 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 769268 7 Foundation 0x00000001919e3a60 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 764512 8 Foundation 0x00000001919e31c4 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 762308 9 Foundation 0x00000001919e307c D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 761980 10 libxpc.dylib 0x00000001ef5a1cbc CD0F76A8-713A-3FDB-877E-386B089BC2D1 + 72892 11 libxpc.dylib 0x00000001ef5a3908 CD0F76A8-713A-3FDB-877E-386B089BC2D1 + 80136 12 libdispatch.dylib 0x000000010401e87c _dispatch_client_callout4 + 20 13 libdispatch.dylib 0x000000010403bec4 _dispatch_mach_msg_invoke + 516 14 libdispatch.dylib 0x00000001040264a4 _dispatch_lane_serial_drain + 376 15 libdispatch.dylib 0x000000010403cea8 _dispatch_mach_invoke + 480 16 libdispatch.dylib 0x00000001040264a4 _dispatch_lane_serial_drain + 376 17 libdispatch.dylib 0x000000010402743c _dispatch_lane_invoke + 460 18 libdispatch.dylib 0x0000000104034404 _dispatch_root_queue_drain_deferred_wlh + 328 19 libdispatch.dylib 0x0000000104033a38 _dispatch_workloop_worker_thread + 444 20 libsystem_pthread.dylib 0x00000001ef550934 _pthread_wqthread + 288 21 libsystem_pthread.dylib 0x00000001ef54d0cc start_wqthread + 8 ) ( 0 CoreFoundation 0x0000000192b00f2c 76A3B198-3C09-323E-8359-0D4978E156F5 + 540460 1 libobjc.A.dylib 0x000000018a9a32b8 objc_exception_throw + 60 2 Foundation 0x000000019198f680 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 419456 3 Foundation 0x000000019198c510 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 406800 4 Foundation 0x00000001919e4cf4 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 769268 5 Foundation 0x00000001919e3a60 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 764512 6 Foundation 0x00000001919e31c4 D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 762308 7 Foundation 0x00000001919e307c D27A6EC5-943C-3B0E-8D15-8840FD2914F0 + 761980 8 libxpc.dylib 0x00000001ef5a1cbc CD0F76A8-713A-3FDB-877E-386B089BC2D1 + 72892 9 libxpc.dylib 0x00000001ef5a3908 CD0F76A8-713A-3FDB-877E-386B089BC2D1 + 80136 10 libdispatch.dylib 0x000000010401e87c _dispatch_client_callout4 + 20 11 libdispatch.dylib 0x000000010403bec4 _dispatch_mach_msg_invoke + 516 12 libdispatch.dylib 0x00000001040264a4 _dispatch_lane_serial_drain + 376 13 libdispatch.dylib 0x000000010403cea8 _dispatch_mach_invoke + 480 14 libdispatch.dylib 0x00000001040264a4 _dispatch_lane_serial_drain + 376 15 libdispatch.dylib 0x000000010402743c _dispatch_lane_invoke + 460 16 libdispatch.dylib 0x0000000104034404 _dispatch_root_queue_drain_deferred_wlh + 328 17 libdispatch.dylib 0x0000000104033a38 _dispatch_workloop_worker_thread + 444 18 libsystem_pthread.dylib 0x00000001ef550934 _pthread_wqthread + 288 19 libsystem_pthread.dylib 0x00000001ef54d0cc start_wqthread + 8 )
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670
Sep ’24
DeviceActivityMonitor is overcounting screen time for users on iOS 17.6.1
Our app uses a 24-hour DeviceActivityMonitor repeating schedule to send users notifications for every hour of screen time they spend on their phone per day. Notifications are sent from eventDidReachThreshold callbacks at 1, 2, 3, etc, hour thresholds to keep them aware of their screen time. We have recently received an influx of emails from our users that after updating to iOS 17.6.1 their DeviceActivityMonitor notifications are saying their screen time was much higher than what is shown in DeviceActivityReport and their device's Screen Time settings. These users have disabled "Share Across Devices" - but I suspect the DeviceActivityMonitor is still getting screen time from their other devices even though that setting is turned off. Has anybody else noticed this, understands what is causing this, or could recommend a fix that we can tell our users to do?
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1.6k
Sep ’24
Live Activity Does Not Appear on devices running iOS 17, built with Xcode 16
We are facing a serious issue affecting the Live Activity of the our app. If the app is built with Xcode 16 (16A242) the Live Activity does not appear on devices running iOS 17. The live activity does appear on devices running iOS 18 RC. If we build the code with Xcode 15, the Live Activity appears on iOS 17 as expected. To investigate this we also prepared a demo bare-bones project to make sure the Live Activity presence is not affected by part of the existing code. Again the issue appears even of the demo app. Is this a known issue with Xcode16/iOS 18?
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4.0k
Sep ’24
Simulating & tools for testing pre-warming state
Hi there I have a large codebase with many dependencies. I have a bug which I suspect is caused by accessing the keychain when the app has launched for pre-warming and as a result the keychain is inaccessible. Are there any recommendations for simulating or testing this app state, and for identifying any static initialisers in my dependencies that could be contributing to my issue? Thanks
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811
Sep ’24
Live Caller ID Lookup Extension - No option in phone settings
iOS 18 (22A3354) will not offer a option in settings (> Apps > Phone) after calling openSettings to enable live caller id lookup extension. iPhone and MacBook are in the same network. The PIRService runs on MacBook and is reachable via iPhone Safari (via http://MacBookPro:8080/). Hummingbird print log: hb_method=GET hb_uri=/ [Hummingbird] Request. After deploying the application via Xcode to the iPhone no requests are printed in the terminal. The extension was added like documented and bundle id is also checked multiple times. issuerRequestUri in service-config.json is http://MacBookPro:8080/issue. As far as I can tell, everything has been set up in accordance with the Testing Live Caller ID instructions. Is there something missing?
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1.3k
Sep ’24
Request .full contacts authorization after being granted .limited
We're adjusting to the new iOS 18 .limited contacts access mode. In our app, we don't request contacts right away. We have a search bar where users can search through their own contacts and select one using the ContactAccessButton. If they do select one, then they're prompted to "Grant Limited Access", not "Grant Full Access", as the screenshot shows below. Later on, we want to offer the ability for users to sync their entire contact book with our app. This will improve their experience on the app by automatically finding all their friends already on the app, without them having to do the manual work of clicking on every single contact in the ContactsAccessPicker. Is this possible right now? It doesn't seem like it—when I call ContactsStore.requestAccess(for: .contacts) while in .limited access mode, nothing happens. But I would like to show a prompt that gives the user the ability to grant all their contacts to improve their experience.
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639
Sep ’24
Checking Equality of ApplicationToken Instances in Swift
Hi everyone, I'm working on a Swift application and trying to determine whether an application has exceeded its limit based on an ApplicationToken. I have the following function to check if the current app's token matches any of the tokens stored when the app limit is reached: private func isAppLimitExceeded(for application: Application?) -> Bool { guard let application = application, let appToken = application.token else { return false } let exceededTokens = configManager.getAppLimitExceededTokens() return exceededTokens.contains { exceededToken in appToken == exceededToken } } The function configManager.getAppLimitExceededTokens() returns a list of [ApplicationToken] that were saved in UserDefaults when an app limit is reached. The goal is to use the isAppLimitExceeded method to verify if the current shield for the app is triggered due to a limit/threshold being exceeded. This function is part of a class that conforms to the ShieldConfigurationDataSource protocol: class ShieldConfigurationExtension: ShieldConfigurationDataSource { // ... } My concern is whether comparing two ApplicationToken instances using == is a reliable method for determining if they are equal. Are ApplicationToken objects guaranteed to be comparable with == out of the box, or do I need to implement Equatable or another method of comparison? Could there be issues with tokens stored in UserDefaults not matching due to reference or serialization differences? Any guidance on how to ensure proper comparison of these tokens would be appreciated! Thanks!
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668
Sep ’24
@IntentParameterDependency Always Returns nil in iOS 18
The following code works perfectly fine in iOS 17, where I can retrieve the desired dependency value through @IntentParameterDependency as expected. However, in iOS 18, addTransaction always returns nil. struct CategoryEntityQuery: EntityStringQuery { @Dependency private var persistentController: PersistentController @IntentParameterDependency<AddTransactionIntent>( \.$categoryType ) var addTransaction func entities(matching string: String) async throws -> [CategoryEnitity] { guard let addTransaction else { return [] } // ... } func entities(for identifiers: [CategoryEnitity.ID]) async throws -> [CategoryEnitity] { guard let addTransaction else { return [] } // ... } func suggestedEntities() async throws -> [CategoryEnitity] { guard let addTransaction else { return [] } // ... } } Has anyone else encountered the same issue? Any insights or potential workarounds would be greatly appreciated. iOS: 18.0 (22A3354) Xcode 16.0 (16A242d)
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697
Sep ’24
Live activity sample code for Swift 6?
Hi, I'm updating our app to use Xcode 16 and Swift 6 language mode. I'm stuck on updating our live activity code. I looked at the Emoji Rangers sample project and after switching it to Swft 6 mode, it has the exact same errors as our project. The main problem seems to be that Activity is not Sendable, which prevents us from passing it to child tasks to await things like activityStateUpdates and contentUpdates (those are also not Sendable). Is there any guidance on this? Updated sample code? Another project?
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845
Sep ’24
Universal link doesn't work after install right away
Hi! We are having a hard time with the universal link, help is appreciated! Thanks in advance! The universal link doesn't work after installation for some time. A user has to wait for from 5 to a couple of hours after the app is installed on the device. This has also affected App reviewers since we need the universal link to work for successful login. Each submission will receive a rejection of we cannot login and it will be approved until we kindly ask them to try again. I believe the JSON is delivered to devices by Apple's CDN system and the fact that it works on most devices most of the time should imply that we have a valid apple-app-site-association setup. So I am really confused about the wait time, which is giving us trouble with app review and a bad user experience
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438
Sep ’24
DeviceActivityEvent with includesPastActivity = false, sometimes does not trigger callback
Sometimes when I schedule a DeviceActivityEvent with the includesPastActivity property set to false, the event is never triggered. I tried with thresholds of 20 seconds and 1 minute and both did not work. I submitted feedback with more details FB15220094. Is anyone else experiencing this issue ? or does anyone know about a fix ?
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432
Sep ’24
iOS 18 启动崩溃 main_executable_path_missing
Triggered by Thread: 0 Thread 0 Crashed: 0 dyld 0x1a87922b0 lsl::PreallocatedAllocatorLayout<278528ull>::init(char const**, char const**, void*) + 436 1 dyld 0x1a878ba38 start + 1960 Thread 0 crashed with ARM Thread State (64-bit): x0: 0x2010003030100000 x1: 0x0000000fffffc0d0 x2: 0x0000000000000004 x3: 0x00000001a87607a9 x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000 x8: 0x2010003030100000 x9: 0x2010003030100000 x10: 0x000000016d923dfd x11: 0x00000001a87ccf30 x12: 0x0000000000000050 x13: 0x0000000000000044 x14: 0x0000000000052010 x15: 0x0000000000000000 x16: 0x0000000000000000 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x00000001801d0000 x20: 0x000000016d923b50 x21: 0x000000016d923af8 x22: 0x00000001e6184050 x23: 0x000000016d9237d8 x24: 0x0000000fffffc10c x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0x0000000000000000 x28: 0x0000000000000000 fp: 0x000000016d923870 lr: 0xb0228001a8792130 sp: 0x000000016d9237d0 pc: 0x00000001a87922b0 cpsr: 0x60001000 far: 0x00000001e61840e0 esr: 0x92000047 (Data Abort) byte write Translation fault Binary Images: 0x1a8758000 - 0x1a87db693 dyld arm64e <77c1eed22ed7396aba34e770120d81d4> /usr/lib/dyld 0x1024dc000 - 0x10594ffff main_executable_path_missing arm64 /main_executable_path_missing 0x0 - 0xffffffffffffffff ??? unknown-arch <00000000000000000000000000000000> ??? Error Formulating Crash Report: dyld_process_snapshot_get_shared_cache failed EOF crash.log
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3.6k
Sep ’24
camera scan QR code does not work after deleting app clips
We removed the APP Clip feature in the latest version, and our server-side synchronous update the "apple-app-site-association" file, remove "appclips" content. now, i use Camera app scan the QR code(regardless of whether the app is installed), the following error occurs:"This app clip is not currently available in your country or region". I checked some information and it might be due to Apple CDN cache, or is there something else I need to do?
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439
Sep ’24
FinderSync Extension UI disappear on macOS 15's Setting
Description We used to use FIFinderSyncController.showExtensionManagementInterface() to navigate to the corresponding Setting's path via a button in our app to make the user enable our FinderSync App. (Or user can navigate manually via "System Settings -> Privacy & Security -> Extensions -> Added Extensions" themselves in Settings.app) But the UI is now disappearing on macOS 15.0 As a result, if user had previously enabled it, user will now be unable to disable it, and if user had not previously enabled it, user will never be able to enable it. STEPS TO REPRODUCE Create an empty macOS app xcodeprojc, add Finder Sync Extension and run it. Or you can use the repo here to reproduce the issue. https://github.com/Kyle-Ye/MenuHelper
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628
Sep ’24
Any workaround for expanding a large category in FamilyActivityPicker?
I’m developing a self-management app using Family Controls, but I’ve encountered a FamilyActivityPciker's crash due to an XPC(or UIRemoteView) issue when there are too many tokens(maybe 200+ items) in a category. This makes bad UX, so I’m looking for a workaround. (I guess that the crash reason is cross process memory limitations, such as App Extension 50MB memory limitation.) A lot of web domains contribute to increase the number of tokens, However, even after clearing Safari’s browsing history, the tokens displayed in the FamilyActivityPicker remains unchanged. Is there any workaround that a 3rd party developer can implement to address this issue? prevent FamilyActivityPicker crashes or reduce the number of web domain tokens? For example, if there’s a way to reset the web domain tokens shown in FamilyActivityPicker from the Settings app, I could offer a help to users. Does anybody have ideas? Expanding SNS Category (29 items) It succeeded. Expanding Productivity & Finance (214 items) It failed. The screen froze, then appears blank. When the number of items is around 100, the crash rate is 50%, but when the items are over 200, the crash rate is 100%. Search Bar Problem The search bar also has same problem. If the number of search results are small, it works good without any blank, but if there are a lot of search results (200+), the XCP crashes and the screen appears blank. Code to Reproduce import SwiftUI import FamilyControls struct ContentView: View { @State private var selection = FamilyActivitySelection() @State private var isPickerPresented: Bool = false var body: some View { VStack { Button("Open Picker") { isPickerPresented = true } } .familyActivityPicker(isPresented: $isPickerPresented, selection: $selection) } } Steps to Reproduce Prepare a category that has 200+ items Try to open the category in the picker The screen will freeze, then appears blank. Errors in Console [u EDD60B83-5D2A-5446-B2C7-57D47C937916:m (null)] [com.apple.FamilyControls.ActivityPickerExtension(1204)] Connection to plugin interrupted while in use. AX Lookup problem - errorCode:1100 error:Permission denied portName:'com.apple.iphone.axserver' PID:2164 ( 0 AXRuntime 0x00000001d46c5f08 _AXGetPortFromCache + 796 1 AXRuntime 0x00000001d46ca23c AXUIElementPerformFencedActionWithValue + 700 2 UIKit 0x0000000256b75cec C01ACC79-A5BA-3017-91BD-A03759576BBF + 1527020 3 libdispatch.dylib 0x000000010546ca30 _dispatch_call_block_and_release + 32 4 libdispatch.dylib 0x000000010546e71c _dispatch_client_callout + 20 5 libdispatch.dylib 0x00000001054765e8 _dispatch_lane_serial_drain + 828 6 libdispatch.dylib 0x0000000105477360 _dispatch_lane_invoke + 408 7 libdispatch.dylib 0x00000001054845f0 _dispatch_root_queue_drain_deferred_wlh + 328 8 libdispatch.dylib 0x0000000105483c00 _dispatch_workloop_worker_thread + 580 9 libsystem_pthread.dylib 0x0000000224f77c7c _pthread_wqthread + 288 10 libsystem_pthread.dylib 0x0000000224f74488 start_wqthread + 8 ) Error acquiring assertion: <Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}>
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2.1k
Sep ’24
Detect iPhone Mirroring in iOS18
Hi everyone, Is there any way to detect an app is being mirrored from an iPhone to macOS via iPhone Mirroring (new feature from iOS18 and macOS 15 Sequoia)? My app has a business requirement to disable screen mirroring and recording (or just display a black screen when it's active). However, the current implementation doesn't seem to work with iPhone Mirroring to macOS. Is there any solution for this? Because as far as I know, seems like there is no API to detect it What I've tried so far 1. Count the UIScreen var totalScreens = UIScreen.screens.count Screen counts: iPhone only (without mirroring or airplay): 1 iPhone Airplay (screen mirroring): 2 iPhone Mirroring (iOS18) to MacOS15: 1 conclusion: both iPhone only and iPhone mirroring to macOS returns the same screen count (no difference) 2. Mask the entire screen with passwordTextField.isSecureTextEntry= true Result iPhone screen recording: Black screen iPhone screen mirroring (AirPlay): Black screen iPhone Mirroring (with macOS): No blackscreen, it works as usual The implementation is similar to https://stackoverflow.com/a/67054892 and https://forums.developer.apple.com/forums/thread/736112?answerId=765331022#765331022 What I want to achieve is something like the FairPlay Streaming API (https://developer.apple.com/streaming/fps/), where it turns the screen black when a screenshot, screen recording, screen mirroring, or iPhone mirroring is active. Thank you
6
1
1.3k
Sep ’24