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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LiveCommunicationKit
What I want to achieve now is that when the app is not running, upon receiving a notification, it displays an interface similar to CallKit with accept and decline buttons. Here is part of my code: @available(iOS 17.4, *) class LiveCommunicationManager: NSObject, ConversationManagerDelegate { static let shared = LiveCommunicationManager() var isInvalidate:Bool = false var configuration: ConversationManager! override init() { let config = ConversationManager.Configuration( ringtoneName: "notes_of_the_optimistic", iconTemplateImageData: UIImage(named: "AppIcon")?.pngData(), // 图标的 PNG 数据 maximumConversationGroups: 1, // 最大对话组数 maximumConversationsPerConversationGroup: 1, // 每个对话组内最大对话数 includesConversationInRecents: false, // 是否在通话记录中显示 supportsVideo: false, // 是否支持视频 supportedHandleTypes: [.generic,.phoneNumber,.emailAddress] // 支持的通话类型 ) configuration = ConversationManager.init(configuration: config) } func reportIncomingCall(uuid: UUID, callerName: String) { configuration.delegate = self let local = Handle(type: .generic, value: callerName, displayName: callerName) let update = Conversation.Update(localMember: local,members: [local],activeRemoteMembers: [local]) Task{ do { try await configuration.reportNewIncomingConversation(uuid: uuid, update: update) print("成功报告新来电") } catch { print("报告新来电失败: \(error.localizedDescription)") } } } func conversationManager(_ manager: ConversationManager, conversationChanged conversation: Conversation) { print("会话状态改变了") } func conversationManagerDidBegin(_ manager: ConversationManager) { print("会话已经开始了") manager.delegate = self } func conversationManagerDidReset(_ manager: ConversationManager) { print("会话将要清除了") } func conversationManager(_ manager: ConversationManager, perform action: ConversationAction) { print("会话接听了") configuration.invalidate() } func conversationManager(_ manager: ConversationManager, timedOutPerforming action: ConversationAction) { print("会话超时了") } func conversationManager(_ manager: ConversationManager, didActivate audioSession: AVAudioSession) { print("会话激活了") } func conversationManager(_ manager: ConversationManager, didDeactivate audioSession: AVAudioSession) { print("会话死亡了") } } 在Appdelegate里设置了这些: func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { // 在这里处理离线推送通知 completionHandler(.noData) // 返回后台任务完成 if let aps = userInfo["aps"] as? [String: Any], let alert = aps["alert"] as? [String : Any]{ // 静默推送的处理逻辑 if #available(iOS 17.4, *) { let manager = LiveCommunicationManager.shared if manager.isInvalidate { return } if let msgType = userInfo["msgType"] as? Int{ if msgType == 5{ manager.configuration.invalidate() }else{ let callerName = alert["title"] as? String ?? "Fanvil" manager.reportIncomingCall(uuid: UUID(), callerName: callerName) } } } } } Xcode has been configured with the necessary capabilities, such as Background Fetch, Voice over IP, Background Processing, and Push Notification. The issue now is that sometimes the code works as expected, allowing the app to wake up when not running and displaying the system interface with accept and decline buttons. However, after a few successful attempts, the app stops waking up, and no notification appears. But when I manually open the app, the didReceiveRemoteNotification method gets triggered. I’d like to know why this stops working after a few times.
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213
Apr ’25
PSA: Call Screening breaks in a multitude of ways; no missed call notifications or badges; not lighting up screen; not visible when using focus;
Call Screening has serious issues right now leading to missing calls from genuine callers because the system does not acknowledge them with missed call notifications or badges in a lot of cases. I'm posting this in the hope of catching an engineer who can bring this to the attention of the teams working on this. Filed as FB20678829 — I ran the following tests with iOS 26.1 beta 3, but the issues have been occurring on iOS 26.0 as well. I used an iPhone, Apple Watch, iPad, and Mac for this. The iPhone has Call Screening enabled with the option „Ask Reason for Calling“ The iPhone has call forwarding enabled to all devices. Test 1: Active Focus Turn on a focus like Do not Disturb on all devices. Lock all devices. Make a phone call to the iPhone with an unknown number. Behavior: iPhone: displays Call Screening UI on the Lock Screen, but it will not light up the screen. You don’t know Call Screening is happening unless you activate the display just in that moment on devices without Always On Display. Watch: does nothing. Mac: does nothing. iPad: displays Call Screening UI on the Lock Screen, but it will not light up the screen. You don’t know Call Screening is happening unless you activate the display just in that moment. In this test the caller does not answer any of the Call Screening questions and just hangs up. The result is that only the Mac displays a missed call notification. iPhone, iPad, and Watch do not acknowledge the missed call (no phone app icon badge, no notification, no badge inside the Phone app itself), you can only see the call inside the Calls list when manually looking for it. Test 2: No Focus Turn off any focus like Do not Disturb on all devices. Lock all devices. Make a phone call to the iPhone with an unknown number. Behavior: iPhone: displays Call Screening UI on the Lock Screen, but it will not light up the screen. You don’t know Call Screening is happening unless you activate the display just in that moment on devices without Always On Display. Watch: does nothing. Mac: displays Call Screening UI when unlocked. iPad: displays Call Screening UI on the Lock Screen, but it will not light up the screen. You don’t know Call Screening is happening unless you activate the display just in that moment. In this test the caller does not answer any of the Call Screening questions and just hangs up. The result is that only the Mac displays a missed call notification. iPhone, iPad, and Watch do not acknowledge the missed call (no phone app icon badge, no notification, no badge inside the Phone app itself), you can only see the call inside the Calls list when manually looking for it. The only improvement here is that the Mac now shows the Call Screening UI. Test 3: Caller answers Call Screening questions An active focus does not matter. Lock all devices. Make a phone call to the iPhone with an unknown number. Once the caller answered the Call Screening questions, the following happens: All devices ring like expected When the caller hangs up or I don’t answer: Mac: Shows Missed Call notification without details iPhone: Shows Missed Call notification with transcript of Call Screening (also badges phone app icon) iPad: does nothing. Watch: Shows the mirrored iPhone notification. Things to note: When turning off call forwarding on iPhone to other Apple devices like iPad and Mac, the phone app icon is always badged for missed calls when Call Screening was active, but no notification is displayed regardless.
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95
Oct ’25
CarKeyRemoteControlSession always returning empty
We are developing an iOS app to connect to vehicles and trigger predefined vehicle controls (door lock/unlock) via the Digital Key framework. We are currently blocked on several aspects and would appreciate your expertise to clarify the following queries. How can we list down connected vehicle information? What is the method to retrieve connection status? How can we perform vehicle control actions (e.g., door lock/unlock)? STEPS TO REPRODUCE Starting the CarKeyRemoteControlSession to Fetch Vehicle Reports Currently, we are using the following API to start a CarKeyRemoteControlSession: open class func start( delegate: any CarKeyRemoteControlSessionDelegate, subscriptionRange subscriptionFunctionIDRange: ClosedRange? = nil, with delegateCallbackQueue: DispatchQueue? = nil ) async throws -> CarKeyRemoteControlSession After successfully creating the session, we check for vehicle reports using the vehicleReports property of CarKeyRemoteControlSession: public var vehicleReports: [VehicleReport] { get throws }
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258
Feb ’25
WeatherKit - missing ForecastHourly field documentation
where can we find documentation on the following fields included in payloads? They're not listed alongside the other fields in the documentation linked below: https://developer.apple.com/documentation/weatherkitrestapi/hourweatherconditions precipitationIntensity snowfallAmount Or if we can get the data type, unit used, and description here that would be great
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265
Mar ’25
[iOS 26] [PushToTalk] Not receiving microphone PCM sample when Transmission Starts from System UI.
Steps To reproduce: Login to application and App has joined the PTC channel. Push the application to background and Lock the device. From the System UI press the talk button which will start transmit. Audio Session has been activated and Audio unit has been initialised properly. On terminator side no media is being played out. Issue observed consistently on specific models which has configured audio codec with Stereo type. More details are added : FB20281626
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154
Oct ’25
CarPlay style API
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?
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309
Feb ’25
Alarm Kit - Sound Repetition
Hello, If I fire an alarm using AlarmKit, using a ringtone that lengths less than 30 seconds, in the last version of iOS (26.0) the sound doesn't repeat. (After about 30 seconds, the sounds stops). BUT in the current version of iOS (26.1), the sound repeats until we slide Stop, thing that I doesn't want. So, is there a way to restore the previous behavior? Or is there a property that can fill this lack? Thank you very much.
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224
Nov ’25
iOS Phone app bug: Long verdict text incorrectly truncated on call details screen
I've discovered a bug in the Phone app on iOS related to how long verdicts are displayed. When a call is identified by a third-party Caller ID app, long verdicts display correctly during the call (they auto-scroll) and in the call log (with an ellipsis at the end). However, on the call details screen, the text is strangely truncated - showing only the beginning of the string and the last word. For testing, I used this verdict: "Musclemen grow on trees. They can tense their muscles and look good in a mirror. So what? I'm interested in practical strength that's going to help me run, jump, twist, punch." I'll attach a screenshots demonstrating the problem:
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286
Mar ’25
How do I launch the Outlook Mail app from my development app?
I want to start the mail application from the development application, but the mail application made by Apple starts. It doesn't work even if I change the default email application to Outlook. When you delete the Apple Mail app, Outlook starts. I want to automatically attach the generated pdf file to the email, but that doesn't work either. Please tell me how to code.
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102
Sep ’25
How to debug a CoreSpotlight extension?
My CoreSpotlight extension seems to exceed the 6 MB memory limit. What’s the best way to debug this? I've tried to attach the debugger on the Simulator but the extension seems to be never launched when I trigger the reindex from Developer settings. Is this supposed to work? On device, I am able to attach the debugger. However, I can neither transfer the debug session to Instruments, nor display the memory graph. So I've no idea how the memory is used. Any recommendations how to move forward? Is there a way to temporarily disable the memory limit since even with LLDB attached, the extension is killed.
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109
Apr ’25
Rosetta 2 - Build 1.0.0.0.1.1744447383
Goal: Manually install an explicit version of Rosetta2 Background: Me and some customers have an old app (intel) which perfectly worked with Rosetta2. In the last week of April most macheines were updated to Mac Os 15.4.1. and the app still starts but certain functionality is bronken. Some fields ind the forms don't write back to the database, some data can't be read from the database. (Most installations will fade out over the next month but it would be great to have the app fully working for data migration.) First try was to step back to 15.4. (Clean Install - Install App - Rosetta installs as expected): no change, app still broken Second try back to 15: (Clean Install - Install App - Rosetta installs as expected): App still broken (!) This is interesting as the app worked for month using Mac Os 15! Third try: Back to MacOS 14 (Clean Install - Install App - Rosetta installs as expected): App is working like nothing happend. (All attempts on same hardware of course.) Reasoning: Rosetta2 was the only software (besides the app itself) installed after clean MacOS installs. Now, my guess is that there were might be a change in Rosetta2 as the app worked on MacOs 15 up the update 15.4.1. was installed. Checking versions (pkgutil --pkg-info com.apple.pkg.RosettaUpdateAuto): Rosetta version MacOS 14: 1.0.0.0.1.1722778371 Rosetta version on MacOS 15.4.1: 1.0.0.0.1.1744447383 To fully verify the cause it would be great to uninstall Rosetta on MacOS15.4.1 machine and explicit install lower version (1.0.0.0.1.1722778371) which must be available somewhere as MacOS14 still gets this version. I know how to uninstall - is there a possibility to manually install an explicit version of Rosetta2?
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90
May ’25
Associated Domain not working to Open App
Hello Having trouble getting associated domain to work in our project. It was working when we used Branch, but our company wants to host the domain ourselves. This is a multi-scheme project, using .xcconfig files to define the correct entitlement per Build. The relevant entitlement file has: com.apple.developer.associated-domains applinks:bm.ddcas.ai in the ....{other irrelevant test associated domains....} The project Team and App ID are taken from the Identifiers screen where the Identifier capabilities has 'associated domains' ticked on. I've also checked elsewhere on AppleDeveloper/Connect to be sure. When we used Branch with domain key app links: bmstores.app.link this worked fine. With https://bm.ddcas.ai (our own host) which is publicly available and has an aasa file in both the main directory and /.well-known, typing this in safari or anything just doesn't attempt to link to the App. The iPhone is in developer mode, and using the developer menu associated domains diagnostic tool, typing https://bm.ddcas.ai results in the diagnostic saying 'The url is a Universal Link for the app with identifier **********.***etc (the app is installed on real iPhone 12, iOS 18.6.2 and my Xcode is 16.4) However, it just doesn't work if we type in https://bm.ddcas.ai and results in a Safari message of '400 not found' and the 'nginx' shows. We have read innumerable Apple Dev posts and StackOverflow posts, as well as several step by step 'how to's' online but this just isn't working. The aasa file is at https://bm.ddcas.ai/apple-app-site-association and is setup as follows: { "applinks": { "apps": [], "details": [ { "appID": "{my Team ID}.{my App ID}", "paths": [ "*" ], "components": [ { "/": "/verification", "?": { "verification_code": "[A-Za-z0-9]{6}" }, "comment": "Matches verification code path" } ] } ] } } Our Server guys say the website (bm.ddcas.ai) is public and hosted, it just doesn't have a /verification path as they say it should redirect before reaching that. Also, our Android redirect works using this site, so this appears to be something specific Apple code is looking for. What, please, are we likely to be missing as it does not seem obvious from the Apple documentation or any of the resources I have checked online. Normally we can figure anything out, but getting nowhere here so the help is appreciated.
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128
Sep ’25
CNContact poster
Hi all, From what I’ve seen on forums and other sources, it appears that nothing can be done to set the contact poster programmatically. Setting the imageData property affects only the thumbnail image. Does anyone know if this is explicitly documented somewhere? I need this information for a POC document. I watched the iOS 17 keynote (where it was introduced), the Platform State of Union, and other WWDC videos, but I couldn’t find any mention of it. The Contacts framework documentation only explains what can be retrieved from this property and doesn’t mention any way to set the contact poster. If anyone has any information on this, please help! Thanks in advance!
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76
Mar ’25
SIri trigger command conflicts
We're having trouble with getting Siri to hand off specific trigger words to our app via shortcuts. I want to be able to say "Hey Siri Myappname Foobar" but in some cases if Foobar is the name of a specific business it may launch maps instead showing locations of those businesses. Is there any way to inform Siri, "no, *****, launch our app as the shortcut specifies!"
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257
Mar ’25
old icon is displayed in some places after updating the app
I changed the AppIcon in Images.xcassets,and distribute a new version on appstore;The icon have changed on the desktop, but elsewhere, such as when switching between apps, the top left corner shows the old version of the icon.When I restart my phone,the top left corner show the new version of the icon;My phone is iPhone 13 Pro Max,iOS 18.4.1;Is there other ways to resolve the problem without restart the phone?
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57
2w
DeviceCheck framework error
We integrated DeviceCheck framework into our app to prevent fraudulent call to our app service around one year ago. Recently, we received a few cases related to this function over Christmas Eve period. Based on the logs we have, it indicated both the following two functions returned errors. But we don't have the exactly errors logged and now we cannot replicate. DCAppAttestService.shared.attestKey() DCAppAttestService.shared.generateAssertion() The other finding we have is some users reporting this issue recently upgraded their devices from iOS 18 to iOS 26. So we are suspecting it's due to either the OS upgrading, or Apple's app attest service degrading. Anyone encountered the similar issues before, or have any idea regarding the root cause? Thanks!
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130
2w
ManagedSettingStore limits and groups
So what's the point of being able to block unto 50 apps per ManagedSettingStore via store.application.blockedApplications (which works fine) until removing the blocked apps or clearing the store. Where the following occurs if you have a social networking group with more than 9 apps only 9 apps will go back into the group and all the others will go onto the springboard all jumbled if you end up with an empty group then tap into the group, it is removed then during the reset all apps are placed back on to the springboard
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332
Jan ’25
Detecting host app bundle ID from keyboard extension to enable "return to app" after deep link
I'm building a voice-to-text keyboard extension that needs to open the main app briefly for audio recording (since keyboard extensions can't record audio), then return the user to their original app. The flow I'm trying to achieve: User is in WhatsApp (or Messages, Slack, etc.) User taps "Voice" button in my keyboard My main app opens via deep link (myapp://keyboard/dictation) App starts recording App automatically returns user to WhatsApp I cannot find a way to detect which app the keyboard is running inside, or which app opened my main app via the deep link. UIInputViewController.textDocumentProxy - No host app information available UIApplication.OpenURLOptionsKey.sourceApplication in application(_:open:options:) - When opened from a keyboard extension, does this return the host app bundle ID or the keyboard extension bundle ID? Private APIs (for research only, not production): _hostBundleID on UIInputViewController - blocked/returns nil on iOS 18 KVC approaches - all blocked Hardcoded app support - Works but requires maintaining a list of popular apps and showing multiple buttons instead of a single "Voice" button My questions: When a keyboard extension triggers a URL open (via SwiftUI Link or UIApplication.shared.open), what does sourceApplication contain? The host app or the keyboard extension? Is there any supported way for a main app to know which app it was launched from, specifically when that launch originated from a keyboard extension? How do apps like "Wispr Flow" achieve seamless return-to-app with a single voice button? They seem to auto-return to whatever app the user was in. Environment: iOS 18.0+ Xcode 16 SwiftUI keyboard using KeyboardKit Any guidance on the recommended approach would be greatly appreciated. I understand there may be privacy reasons for limiting host app detection, but the UX of requiring users to manually swipe back (or tap app-specific buttons) is significantly worse than automatic return.
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