Since integrating MapKit JS, we’ve begun receiving production error reports with the following message: Uncaught DataCloneError: Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope': ArrayBuffer is not detachable and could not be cloned. It appears that MapKit JS’s internal worker occasionally calls postMessage() with an ArrayBuffer that cannot be detached under Chrome 120+. This causes the structured clone to fail and the error surfaces uncaught from within the worker. MapKit JS Version: 5.79.109 Browser: Chrome 120.0+ OS: Windows 10 Is this a known issue with MapKit JS? If so, are there recommended workarounds or planned fixes?

Since iOS 26 the delegate method locationManager(:didVisit:) is no longer invoked reliably while locationManager(:didUpdateLocations:) continues to be called regularly on the same devices. The issue appears to be directly tied to iOS version updates. Visit callbacks worked consistently under iOS 18.x but in some cases stopped being invoked immediately after updating the same device to iOS 26.0. In other cases didVisit worked on iOS 26.0 but stopped after updating to 26.0.1 and similarly from 26.0.1 to 26.1. The behaviour is inconsistent with no identifiable pattern and affects multiple recent device models. All required configuration is in place: – startMonitoringVisits() is called correctly – location permission is set to “Always”– background mode for location updates is enabled – allowsBackgroundLocationUpdates is enabled – restarting the app or the device does not fix the problem The only workaround that restores visit monitoring is deleting the app and reinstalling the same App Store version which is not a viable solution for end users. Have other developers experienced the same issue and are there any recommended best practices or technical guidelines to handle missing didVisit callbacks after updating to iOS 26?

Hi, I’m a member of the Apple Developer Program and I’m planning to use Apple Maps Server API together with MapKit JS for a production, customer-facing web service. I have reviewed the Apple Developer Program License Agreement (including Schedule 6 – Apple Maps Services) and the documentation, but I still need clarification on several points to ensure that our usage fully complies with Apple’s policies. Daily quota and additional capacity From the documentation, I understand that there is a daily limit of 250,000 map views and 25,000 service calls per Apple Developer Program membership, shared between MapKit JS and Apple Maps Server API. When the 25,000 service calls are exceeded, the API returns HTTP 429. Should this limit be considered a hard limit for production use? The wording “For additional capacity needs, contact us” is unclear. Is there any official channel or program to request a higher quota, or should we assume this is not practically available and design our system to always stay within the documented limit? Caching of geocoding / reverse-geocoding results Schedule 6 section 2.5 restricts caching, prefetching, or storing map data except when temporary and only as necessary for Apple Maps Services, and any cached data must be deleted after use. To understand what “temporary” means in practice, I would like to confirm whether the following scenarios are acceptable: (a) In-memory cache during a single page or tab session: - Store geocoding results (latitude/longitude and normalized address) only in a JavaScript in-memory structure (e.g., a Map object) during the lifetime of the browser tab. - Delete all cached results when the tab is closed or after a short TTL (for example, a few minutes). (b) sessionStorage with a short TTL: - Store geocoding results in window.sessionStorage on a per-tab basis. - Apply a short TTL (for example, a few minutes), and delete the data when the TTL expires or the tab is closed. Are both (a) and (b) considered acceptable forms of “temporary caching” under section 2.5, or should we avoid sessionStorage and limit ourselves to purely in-memory (non-persistent) caching? Use on a commercial customer-facing website Our intended use case is a public website that: Displays store locations on a map Allows users to search for nearby stores Optionally shows routing directions We do not do fleet management, asset tracking, enterprise route optimization, or insurance risk scoring. Is this type of consumer-facing store-locator use case permitted under the Apple Maps Services terms? Any clarification from the Maps or MapKit teams would be greatly appreciated. Thank you. Best regards, Naoto Omori

I'm trying to simulate GPS in the iOS Simulator, but Debug → Simulate Location is greyed out even though I'm: Running the iOS scheme On an iPhone simulator only (no watch paired) Build configuration = Debug allowLocationSimulation="YES" in the scheme

Hi, this is a series of questions for the Apple developers, and also for anyone that would like to speculate. How are they able to get trees marked on the in-app map? And how come they are fairly but not completely accurately marked?

Hello 👋🏼, We are using MapKit JS to display maps on our application working on two domains .com and .cn. Everything is working for all ours users in the world except for users using Chinese local network. After investigation, there is an error display in the browser console: [MapKit] Initialization failed because the authorization token is invalid. As the tokens are used as they are for the rest of the world, we know that they are valid... 😕 Problem appears on all browsers: Current versions of MapKit JS mapkit-typescript @ 5.18.2 https://cdn.apple-mapkit.com/mk/5.49.x/mapkit.js Do you have any tips, suggestions to help us 🙏 ? Aurélien.

I have a test application I'm working on (so it's a fresh Xcode project under Sonoma - with older map code borrowed from another project). It is a macOS application. And in Obj-C. When the map window is opened the logs contain the following - I've been trying to hunt down and resolve. Thank you in advance for any clues/pointers. Failed to locate resource "default.csv" Failed to locate resource "satellite@2x.styl" Failed to locate resource "satellite@2x.styl" Failed to locate resource "satellite.styl" Failed to locate resource "satellite@2x.styl" Failed to locate resource "satellite@2x.styl" Failed to locate resource "satellite.styl" Failed to locate resource "satellite.styl" Couldn't find satellite.styl in framework, file name satellite.styl Authorization status: Authorized The application does have MapKit.framework included.

I’m facing an issue with iOS that I hope someone can help with. I developed an app a few years ago that records GPS tracks. Up until recently, everything worked fine—even when the app was running in the background, the recording continued without problems. However, since releasing an update compiled after the iOS 18 release, users have reported that background tracking no longer works. I’ve reviewed the iOS documentation but haven’t found any relevant changes or solutions. Before the newly compiled release the app was working well on iOS 18 devices as well. Some users have reported that switching to the location permission from "When Using the App" to "Always" solved the issue. This is not the case for all users. Has anyone else encountered this issue? Any recommendations or insights on how to resolve it would be greatly appreciated. Below you can see the code used for the location tracking. Before the issue happened the app was compiled with XCode 15.4. Now I am using XCode 16.2 locationManager.activityType = CLActivityType.fitness locationManager.desiredAccuracy = kCLLocationAccuracyBest locationManager.distanceFilter = 3 locationManager.allowsBackgroundLocationUpdates = true locationManager.pausesLocationUpdatesAutomatically = false if #available(iOS 11.0, *) { locationManager.showsBackgroundLocationIndicator = true } locationManager.startUpdatingLocation() if #available(iOS 17.0, *) { // Create a CLBackgroundActivitySession object backgroundActivitySession = CLBackgroundActivitySession() } Thanks in advance for your help!

Hi, Apple recently announced DL-TDoA (Downlink TDoA) support on iOS26. This API is currently marked as Beta. We are working on integrating this functionality into our app, already added the APIs and tried to configure a new DL-TDoA session using NIDLTDOAConfiguration (the only parameter it takes is networkIdentifer). The session is configured but automatically invalidated by the OS. When is DL-TDoA expected to be fully supported by phones? Can we expect a detailed documentation or specification explaining how to arrange the session with the DT-Anchors (channel, ranging duration, ...)? Do we need Bluetooth LE connection with the anchors while running DL-TDoA? We already have the 4 DT-Anchors (1 initiator and 3 responders) ready, looking forward to be able to test this new exciting feature and get DL-TDoA measurements to trilaterate the phone position within a map. Regards.

Apple recently announced DL-TDoA (Downlink TDoA) support on iOS 26, and the API is currently marked Beta. Using two iPhones (16 Pro and 13) on iOS 26.0 Beta, I’m starting a Nearby Interaction session and need to read NITLDOA parameters (address, carrier frequency offset, signal strength/RSSI), but I can’t find a supported way. I’m also seeing asymmetry: iPhone 13 reports distance+direction, while 16 Pro reports distance only. Is there a supported workflow/API to access those parameters, and any known device/OS constraints that would cause direction to be unavailable on 16 Pro?

1. The Inquiry Hello, I have been implementing a background geofencing feature and, during testing, I found a significant numerical difference in event callback frequency between the older CLCircularRegion API and the newer CLMonitor API (CLMonitor.CircularGeographicCondition), introduced in iOS 17. My testing was strictly conducted using the "Always Allow" location permission (requestAlwaysAuthorization()). I used both APIs in parallel under identical geofencing conditions and within the same implementation environment. Since a clear difference persists in the data, I suspect this may stem from structural differences in the internal mechanisms of the two APIs rather than an implementation error on my part. 2. Environment and Implementation Details (Proof of Integrity) I have ensured that my implementation adheres to Apple's guidelines and uses modern Swift concurrency features. A. Development Environment and Permissions iOS Version: iOS 18.x and later Xcode Version: Version 17A400 (Version 26.0.1) Location Authorization: Always permission obtained. Background Mode: Location updates is configured correctly in Info.plist. B. CLMonitor Initialization and Lifecycle I implemented robust lifecycle management to ensure CLMonitor is stable and persists correctly: Initialization: I performed CLLocationManager object allocation and related service setup (e.g., CLServiceSession set to always) within the call stack frame of didFinishLaunchingWithOptions. Monitor Management: I use an Actor-based Singleton pattern to guarantee that only a single CLMonitor instance is used application-wide. Event Monitoring: Following initialization, I allocated a background Task containing the for try await event in await monitor.events loop. This Task is explicitly managed to persist in the background until the application is terminated, ensuring continuous event listening. C. Registration Limit Management I manage both APIs to ensure they never exceed the recommended maximum of 20 simultaneously monitored regions/conditions. My logic removes the oldest item (LRU) when the limit is reached. The average registration counts during the test period were highly similar: Component Average Registered Count CLCircularRegion count 7.02 CLMonitor.CircularGeographicCondition count 7.04 This confirms that registration count is not the cause of the event frequency difference. 3. Data-Based Observation The test data (bubble_test_data_for_apple_forum.csv) records the event callbacks for both APIs under identical conditions: Component Total Count Percentage of All Events (%) CLCircularRegion Delegate Total Calls 617 83.56% CLMonitor Event Total Fires 122 16.44% Overall Total Count 739 100% A. Key Findings CLCircularRegion Operability: 617 calls confirm that core implementation factors (permissions, background setup, etc.) are functioning correctly. Disparity in Frequency: Despite running in parallel, the CLMonitor event count (122) is approximately 1/5th the frequency of the CLCircularRegion calls (617). Efficiency per Registration: CLCircularRegion averaged ~0.86 calls per registered item, while CLMonitor averaged only ~0.17 calls per registered item. 4. Questions for Apple Engineering Based on the robust implementation and the data presented, I request a review of the following potential differences between the APIs: Internal Mechanism Differences: Are there structural differences in how CLCircularRegion and CLMonitor.CircularGeographicCondition process and schedule geofencing event callbacks? For instance, do they differ in terms of battery optimization priority, event batching, or internal throttling mechanisms? CLMonitor Event Ratio: Is the phenomenon where CLMonitor records a significantly lower ratio of events compared to CLCircularRegion an intended behavior, or could this be indicative of a specific environmental factor that affects the newer API differently? Thank you for your time and assistance. geofence-test-data.csv

We are currently experiencing a very interesting issue when accessing the location in the background with CLLocationManager. The user has given our app the "whenInUse" permission for locations and in most cases the app provides location updates even when it's in the background. However, when we started to use other navigation apps in the foreground we saw that the func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) method was called with (kCLErrorDomain error 1.). The user hasn't changed the location permission and we saw that locations were delivered once the user opened the app again. I don't see anything in the documentation explaining this issue, but I chatted with other developers that confirm that specific behavior. Am I missing something here?

Apple Feedback Ticket: FB16804936 Background We develop a parental control application called Adora Kids (https://apps.apple.com/us/app/adora-kids/id6443787669) that requires "Location Always" permission to function properly. Our app has Screen Time authorization and provides monitoring services for parents. Issue We are experiencing a recurring problem where child users receive the system notification "Adora accessed your location in the background" every few days. This frequently results in children disabling location permissions, which prevents our app from functioning as intended. Current Approach and Limitations We have explored using Content & Privacy Restrictions for Location Services as a potential solution, but have encountered two significant limitations: These restrictions cannot be accessed programmatically via the ManagedSettings framework (unlike AppStoreSettings and other restrictions). The current implementation is "all-or-nothing" - enabling location restrictions blocks permission changes for ALL apps on the device, preventing children from granting legitimate location access to other applications. Questions Is there a way to programmatically access and manage Content & Privacy Restrictions for Location Services through the ManagedSettings framework that we might have overlooked? Are there any recommended approaches for apps with Screen Time authorization to prevent users from changing specific permissions (particularly location) while still allowing them to manage permissions for other apps? Does Apple have plans to implement app-specific permission locking for apps with Screen Time authorization in future iOS releases? Are there any alternative approaches or workarounds that other developers have successfully implemented for this use case? Any guidance from the developer community or Apple engineers would be greatly appreciated. This is a critical functionality issue affecting the reliability of our parental control service. Thank you in advance for your assistance.

Hello, I am developing with the Nearby Interaction framework using third-party UWB accessories (Murata SR040/SR150). I observed a difference between U1-based and U2-based iPhones: iPhone 12 Pro (U1 chip) NINearbyObject.direction returns valid 3D vector (x, y, z). Distance and direction both work as expected. iPhone 15 Pro and iPhone 16 Pro (U2 chip) NINearbyObject.direction is always nil. Only distance is returned (around 0.35–0.40 m in my test). Effectively behaves as "distance-only mode". Environment: Hardware: iPhone 12 Pro, iPhone 15 Pro iOS version: 18.5 Accessory: Murata UWB SR040 / SR150 App: Using NINearbyAccessoryConfiguration with BLE-based discovery Info.plist includes NSNearbyInteractionUsageDescription Camera assistance was tested both ON and OFF Expectation: I expected the U2 chip to behave consistently with U1, i.e. provide direction vectors when possible. Instead, on iPhone 15 Pro, direction is always unavailable (nil) while distance is returned correctly. Questions: Is this an intentional limitation for U2 chip + third-party accessories? Is there a new requirement (e.g. certification, firmware update, capability flags) to enable direction on U2 devices? Could this be related to NIDeviceCapability or the new Extended Distance Measurement (EDM) mode in U2? Thanks in advance for any clarification.

Hello, This is my first post in the forums, and I'm still learning my way with iOS Development and Swift. My apologies if the formatting is not correct, or If I'm making any mistakes. I'm currently trying to implement an iOS App where the device needs to share the location with my server via an API call. The use case is as follows: the server expects location updates to determine if a device is inside/outside a geofence. If the device is stationary, no locations need to be sent. If the device begins moving, regardless of whether the app is in foreground, background, or terminated, the app should resume posting locations to the server. I've decided to use the CLLocationUpdate.liveUpdates() stream, together with CLBackgroundActivitySession(). However, I have not been able to achieve the behavior successfully. My app either maintains the blue CLActivitySession indicator active, regardless of whether the phone is stationary or not, or kills the Indicator (and the background capability) and does not restore it when moving again. Below I've attached my latest code snippet (the indicator disappears and does not come back). // This method is called in the didFinishLaunchingWithOptions func startLocationUpdates(precise: Bool) { // Show the location permission pop up requestAuthorization() // Stop any previous sessions stopLocationUpdates() Task { do { // If we have the right authorization, we will launch the updates in the background // using CLBackgroundActivitySession if self.manager.authorizationStatus == .authorizedAlways { self.backgroundActivity = true } else { self.backgroundActivity = false self.backgroundSession?.invalidate() } // We will start collecting live location updates for try await update in CLLocationUpdate.liveUpdates() { // Handle deprecation let stationary = if #available(iOS 18.0, *) { update.stationary } else { update.isStationary } // If the update is identified as stationary, we will skip this update // and turn off background location updates if stationary { self.backgroundSession?.invalidate() continue } // if background activity is enabled, we restore the Background Activity Session if backgroundActivity == true { self.backgroundSession = CLBackgroundActivitySession() } guard let location = update.location else { continue } // Do POST with location to server } } catch { print("Could not start location updates") } } } I'm not sure why the code does not work as expected, and I believe I may be misunderstanding how the libraries Work. My understanding is that the liveUpdates stream is capable of emitting values, even if the app has gone to the background/terminated, thus why I'm trying to stop/resume the Background Activity using the "stationary" or "isStationary" attribute coming from the update. Is the behavior I'm trying to achieve possible? If so, I'm I using the right libraries for it? Is my implementation correct? And If not, what would be the recommended approach? Regards

We are experiencing an issue where MKMapView appears red on the app builded with Xcode 16 and executed on iOS 18 simulator. Only the ground is affected and buildings or POIs stay normal color. Xcode 16.1 beta 3 shows same result. Is there any similar case?

In my app, I am using geofencing to perform an action when the user enter or leaves a specified location. The geofencing (CLMonitor) is active permanently, and should work across multiple app sessions or after the device is restarted. It should also work after the app was minimized or terminated. This worked perfectly with iOS 17 and prior, but with iOS 18, things changed. As soon as iOS 18 dropped, users were informing me that the app does no longer perform the entry/exit action reliably (without me making any changes to the app). Most of the times, events are missed entirely. Sometimes, after the user opens or resumes the app, duplicate events are delivered and/or events with the current time instead of the correct time of entry/exit. I am making sure that the app has the "Always" location permission before geofencing is enabled The gefocence radius is between 20 and 500m, but even with the max. radius specified, the geofencing is unreliable For the same user and geofence, the entry/exit event is delivered occasionally, but not always I am currently not using CLLocationManager.allowsBackgroundLocationUpdates (even though it's documented as "Apps that receive location updates when running in the background must include the UIBackgroundModes key (with the location value) in their app’s Info.plist file") because it wasn't necessary on iOS 17 and in my tests, using it didn't yield any improvements In my search for what could have caused this change, I found this WWDC video about location authorization: . It appears that with iOS 18, it is now required to have an active CLServiceSession to ensure that location updates are delivered to my app. Even though the video is long (and I've watched it multiple times), some things are still unclear. For example, the docs state: If your app actively receives and processes location updates and terminates, it should restart those APIs upon launch in order to continue receiving updates. Also, in the video it is stated that: ... So your job, ..., is to make sure that your process launch logic knows what features it has been tasked with pursuing, and re-takes session objects... But on the other hand it's also said that: you can only start holding one (a CLServiceSession) when your app is in the foreground and also ... CLMonitor.events won’t yield results when it is not in use, unless a session which was started in the foreground, .... To summarize my questions, for the geofencing to work as described above: when exactly do I need to create a CLServiceSession if the app is launched into the backgorund? Immediately in the applicationDidFinishLaunching method, even though the app is still in the background (applicationState is background)? Or later on, when the app is opened again by the user, e.g. in applicationDidBecomeActive (and applicationState is active)? do I need to specify the background mode capability as noted in the Handling location updates in the background article? do I need to create a CLBackgroundActivitySession as noted in the Handling location updates in the background article? does it matter, which of the four initializer methods I am using to create the CLServiceSession (with CLServiceSessionAuthorizationRequirementAlways)? does it matter if I specify NSLocationRequireExplicitServiceSession in the Info.plist or not when I already do ensure that the app has the "Always" location permission when the feature is being enabled Does a CLServiceSession last indefinitely and should it only be invalidated once the user disables the feature?