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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How to manage child device's apps through an app on parent's phone using Screen Time Controls?
When we request auth from the AuthorizationCenter, it seems that we're only really able to allow users to control the apps on the parent's phone. Is there a way to allow us to let parents manage apps on the kid's device directly through our parent app? For context, we have 2 different apps, one for the parent and one for the child. The child is able to purchase screen time and the parent can redeem them (activate those minutes) from their end.
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Jan ’25
How to Set Up Deferred Deep Linking
I have universal links configured for my iOS app which work as expected when the app is installed. When the app is not installed the universal link will go to the browser as expected. What I want to do is redirect to the app store, allow the user to install the app, then redirect them to the initial universal link. Redirecting them to the app store isn't the hard part I can achieve that from the webpage, however I don't know how to save a reference to that initial link to redirect them once they instal the app. What I want the flow to be for a user who doesn't have the app is: visit a universal link (example.com/UUID) redirect to the app store and install the app open the app and redirect to example.com/UUID I've seen some ways people are doing this with the clipboard but I don't love that solution, I also don't want to use a 3rd party service if I can avoid it - how are the 3rd party services making this happen?
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4.6k
Jan ’25
WeatherKit request fail
Hello, I have an app on the App Store built around WeatherKit and it was working fine, up until this morning when I started seeing errors when using the app. When debugging using Xcode I see the familiar error Failed to generate jwt token for: com.apple.weatherkit.authservice with error: Error Domain=WeatherDaemon.WDSJWTAuthenticatorServiceListener.Errors Code=2 "(null)" which, according to what I've read on the forums looks like an authentication error. Attaching a network debugger to the Simulator, I saw this error: This I have tried: Verify that WeatherKit is enabled on both Capabilities and App Services tabs on the Dev Portal. Toggle on/off this value and regenerate Provisioning Profiles Uninstall/reinstall Checking that I have API available calls. Nothing. If I create a new Bundle ID and sign with that, it works correctly. But this is not an option since that will force all my customers to download everything from scratch. I am getting emails from customers demanding money back and I can't figure out what has happened. The only thing I can think of, is that I started developing an Apple Watch app to complement the iOS app, but that was last week and everything was working fine.
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Jan ’25
Inquiry about the data format for Live Caller ID Lookup
Hello! https://github.com/apple/live-caller-id-lookup-example/blob/main/Sources/PIRService/PIRService.docc/DataFormat.md The link above shows the data format that the user who gets a call, can get. I wonder if it is also possible to add other fields, for example: "summary". I am currently in the design-phase of an app that aims to present what the last call between the two parties was about, and that information can be gotten from an API that I will build according to Apple's principles that is comaptible with the Live Caller ID Lookup protocol. Therefore adding a field that will present a short summary of the last call will be very handy. Is that possible?
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1k
Jan ’25
App Crashes on iPhone 15 Pro and iPhone 16 After App Store Installation
Hello everyone, I'm experiencing an issue with my app, and I would greatly appreciate any guidance. Here's the situation: My app works flawlessly on the simulator for all iPhone models (16, 16 Pro, 16 Pro Max, SE, etc.). It runs without issues on physical iPhone 11 devices (both mine and a friend's). However, when my friend installs the app from the App Store on their iPhone 15 Pro or iPhone 16, it crashes immediately upon opening. Steps I’ve taken so far: Verified that the app works on the simulator for the same models where it crashes in real life. Updated the app's minimum deployment target to iOS 18, but this did not resolve the issue. The app still crashes on the physical iPhone 15 Pro and 16 models while continuing to run fine on previous physical devices and all simulated ones. Additionally, I had another friend beta test the app through TestFlight on their iPhone 15 Pro, and they received an alert message indicating that the app had crashed when they tried to open it. This confirms the issue still exists after my attempted fixes. I'm unsure what could be causing this discrepancy between the simulated and physical devices, or what the alert message in TestFlight might signify. Has anyone encountered a similar issue, or does anyone have suggestions on what I should do to fix this? Thanks in advance for your help!
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Jan ’25
Clarification on Opening Main App from Share Extension and App Store Submission
Hello, In our application, we have implemented an app extension to allow users to open the main app directly from the share activity window. To achieve this, we used the openURL(:) method from the NSExtensionContext class, as documented here: openURL(:). However, we received one post from Apple stating that opening the main app directly is typically only supported in extensions such as Today widgets or iMessage apps. They also mentioned that this approach may require an additional review during the App Store submission process. Link: https://developer.apple.com/documentation/foundation/nsextensioncontext/1416791-openurl Could someone clarify: If using openURL(_:) in a share extension to open the main app would lead to potential issues during App Store submission? Are there specific guidelines or alternative approaches we should follow to ensure compliance? Any insights or recommendations would be greatly appreciated. Thank you!
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Jan ’25
Shortcut Automation Support
I am currently facing an issue when trying to enable Shortcut support and would greatly appreciate your assistance in resolving it. I have successfully enabled Shortcut support, and I can find my app and its respective functionalities within the Shortcuts app. However, I am unable to locate my app when attempting to create an automation within Shortcuts. I would appreciate any guidance or solutions you may offer regarding this matter.
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Jan ’25
Social Login Firebase
I'm using react native with expo, firebase for auth, and I have google, facebook and Apple Sign In enabled. On my IOS simulator I can sign in using all 3 with no problems, but when I build and submit to test flight and test on a real device only google sign in works It crashes when I try to sign in with facebook and I get an error saying The operation couldn't be completed. (com.apple.AuthenticationServices.AuthorizationError error 1000.)
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Jan ’25
Allowing workaround for FamilyActivityPicker crash
As discussed and acknowledged here, there is a known bug with the FamilyActivityPicker. When a user expands a category that contains enough tokens to exceed the 50mb memory limit, the FamilyActivityPicker crashes. This happens quite frequently for heavy Safari users. An apple engineer mentioned on this thread that WebDomains shown in the picker are present based on the last 30 days of usage data as surfaced by WebKit. Is there any way a user can clear these WebDomains? Either programatically through our app or any other process we can guide them to as a workaround while this issue is getting fixed?
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Jan ’25
Issue with RCS Message Filtering on iOS 18.2.1 and 18.3
Hi Apple Developers, I am currently working on a message filtering application and facing issues specifically with filtering RCS (Rich Communication Services) messages. To debug this, I created a sample app that consistently categorizes all incoming messages as "junk." However, the filtering behaviour is inconsistent and not functioning as expected. Here are the key issues observed during testing on iOS versions 18.2.1 and 18.3: Inconsistent Filtering Behavior: When a message is received from an unknown number, it sometimes gets moved to the Junk folder momentarily but is then immediately moved back to the main Messages inbox. In some cases, the message does not get moved to the Junk folder at all, despite the app returning the verdict as "junk." Duplicate Contact Tiles: The Messages app displays two separate conversation tiles for the same mobile number, which is unexpected behavior. I have attached both a sample app and a screen recording that clearly demonstrates the issue. The recording shows that the app categorizes messages as junk, yet they still end up in the main Messages inbox. For reference, my carrier partner is T-Mobile. Please let me know if you need any additional information to investigate this issue further. Looking forward to your insights and guidance. Best regards, Rijul Singhal
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Feb ’25
CallDirectoryExtention - How to remove a phone number entry that has already been added if a specific value is retrieved.
The App has the ability to use WebKit and display web pages and the ability to add phone numbers to CallDirectory at specific timing. In this App, when the App is launched or when the Add Contact button on the web page is pressed, CallDirectoryExtention is reloaded from the host app (WebKit-viewController), the phone number is retrieved from the server, and the entry is updated. I would like to add a process to remove the already added phone number entry when a specific value is retrieved from the application server. The specific process we wish to implement is as follows. Step 1: Use URLsession to retrieve values from the application server. (ViewController) Step 2: If the value is a specific value, call a Function that deletes the CallDirectoryExtention entry. (ViewController) Step 3: Delete all entries for the registered phone numbers.
 However, I am aware that I have to use reloadExtension() to call the CallDirectoryExtention process from ViewController on Step2. if I do so, CallDirectoryHandler.beginRequest() will be processed, and I am wondering if it is not possible to execute only the Function that deletes the entry. Is there a way to run only the Function that deletes the CallDirectoryExtention entry from the host app(viewController)?
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Feb ’25
Refresh Widget doesn't work from background push notification.
As stated in other posts like: https://developer.apple.com/forums/thread/734488 https://developer.apple.com/forums/thread/652946?answerId=823555022#823555022 Even though the recommended way from Apple documentation is to use push notifications to reload widgets timelines calling WidgetCenter.shared.reloadAllTimelines(), it is unreliable and I couldn't find a pattern of why it works 10% of times and not the other 90%. While the debugger is connected to the App it always works though. My widget needs to reflect updated information otherwise it becomes useless since it display smart home devices states such as the Apple Home widget does as well.
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365
Feb ’25
Performance Implications of XPC polling
On my MAC, I have a XPC server running as a daemon. It also checks the clients for codesigning requirements. I have multiple clients(2 or more). Each of these clients periodically(say 5 seconds) poll the XPC server to ask for a particular data. I want to understand how the performance of my MAC will be affected when multiple XPC clients keep polling a XPC server.
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Feb ’25
About the problem that DeviceActivityMonitorExtension does not work
I am developing an app that can help users disable selected apps at a specified time, so that users can get away from their phones and enjoy real life. Here is my data structure: extension ActivityModel { @NSManaged public var id: UUID @NSManaged public var name: String @NSManaged public var weeks: Data @NSManaged public var weekDates: Data @NSManaged public var appTokens: Data } Among them, weeks is of [Bool] type, indicating which weeks from Sunday to Saturday are effective; weekDates is of [[Date,Date]] type, indicating the effective time period; appTokens is of Set type, indicating the selected apps。 At the beginning, I will open a main monitor: let deviceActivityCenter = DeviceActivityCenter() do{ try deviceActivityCenter.startMonitoring( DeviceActivityName(activityModel.id), during: DeviceActivitySchedule( intervalStart: DateComponents(hour: 0,minute: 0,second: 0), intervalEnd: DateComponents(hour: 23,minute: 59,second: 59), repeats: true ) ) }catch { return false } Since the time range may be different every day, I will start the sub-monitoring of the day every time the main monitoring starts: override func intervalDidStart(for activity: DeviceActivityName) { super.intervalDidStart(for: activity) if activity.rawValue.hasPrefix("Sub-") { ActivityModelManager.disableApps( Tools.getUUIDFromString(activity.rawValue) ) return } let weekIndex = Calendar.current.component(.weekday, from: .now) let weeks = ActivityModelManager.getWeeks(activity.rawValue) if weeks[weekIndex] { let weekDates = ActivityModelManager.getWeekDates(activity.rawValue) let deviceActivityCenter = DeviceActivityCenter() do{ try deviceActivityCenter.startMonitoring( DeviceActivityName("Sub-" + activityModel.id), during: DeviceActivitySchedule( intervalStart: getHourAndMinute(weekDates[weekIndex][0]), intervalEnd: getHourAndMinute(weekDates[weekIndex][1]), repeats: false ) ) }catch { return } }esle { return } } I will judge whether it is main monitoring or sub monitoring based on the different activity names. When the sub-monitor starts, I will get the bound application and then disable it: static func disableApps(_ id : UUID){ let appTokens = ActivityModelManager.getLimitAppById(id) let name = ManagedSettingsStore.Name(id.uuidString) let store = ManagedSettingsStore(named: name) store.shield.applications = appTokens return } When the child monitoring is finished, I resume the application: static func enableApps(_ id : UUID){ let name = ManagedSettingsStore.Name(id.uuidString) let store = ManagedSettingsStore(named: name) store.shield.applications = [] } The above is my code logic. When using DeviceActivityMonitorExtension, I found the following problems: intervalDidStart may be called multiple times, resulting in several sub-monitors being started. After a period of time, the monitoring is turned off. The static methods enableApps and disableApps are sometimes not called
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709
Feb ’25
Getting a file icon on iOS
Some time ago I read somewhere that one can get a file icon on iOS like this: UIDocumentInteractionController(url: url).icons.last!) but this always returns the following image for every file: Today I tried the following, which always returns nil: (try? url.resourceValues(forKeys: [.effectiveIconKey]))?.allValues[.effectiveIconKey] as? UIImage Is there any way to get a file icon on iOS? You can try the above methods in this sample app: struct ContentView: View { @State private var isPresentingFilePicker = false @State private var url: URL? var body: some View { VStack { Button("Open") { isPresentingFilePicker = true } if let url = url { Image(uiImage: UIDocumentInteractionController(url: url).icons.last!) if let image = (try? url.resourceValues(forKeys: [.effectiveIconKey]))?.allValues[.effectiveIconKey] as? UIImage { Image(uiImage: image) } else { Text("none") } } } .padding() .fileImporter(isPresented: $isPresentingFilePicker, allowedContentTypes: [.data]) { result in do { let url = try result.get() if url.startAccessingSecurityScopedResource() { self.url = url } } catch { preconditionFailure(error.localizedDescription) } } } }
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Feb ’25