Health & Fitness

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Explore the technical aspects of health and fitness features, including sensor data acquisition, health data processing, and integration with the HealthKit framework.

Health & Fitness Documentation

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HKAnchoredObjectQuery updateHandler stops working with error
Hi! I am using the HKAnchoredObjectQuery to first get a snapshot of the initial results, and then trigger an updateHandler. I need to handle the initial results and the updates separately, which is why I implemented two completions. When I test the code, it works for a while. New and deleted samples trigger the updateHandler. However, after a while there appears an error: [connection] nw_read_request_report [C2] Receive failed with error "Software caused connection abort" Followingly, the updateHandler will stop getting triggered when I add updates in Apple health. Anyone have experience with this? func getMostRecentSample(for sampleType: HKSampleType, anchorKey: String, completion: @escaping (HKQuantitySample?, Error?) -> Swift.Void, updateHandler: @escaping (HKQuantitySample, Error?) -> Swift.Void) {     // If it is the first initialization, anchor is passed as nil     var anchor: HKQueryAnchor? = nil // Check for previous saved anchor in userdefaults     if UserDefaults.standard.object(forKey: anchorKey) != nil {       let data = UserDefaults.standard.object(forKey: anchorKey) as! Data       do {         guard let newAnchor = try NSKeyedUnarchiver.unarchivedObject(ofClass: HKQueryAnchor.self, from: data) else {           print("Could not parse anchor to HKQueryAnchor type")           return         }         anchor = newAnchor       } catch {         print("Error retreiving anchor from UserDefaults")       }     }     let query = HKAnchoredObjectQuery(type: sampleType,                      predicate: nil,                      anchor: anchor,                      limit: HKObjectQueryNoLimit                       ) { (query, samplesOrNil, _, newAnchor, errorOrNil) in       guard let samples = samplesOrNil as? [HKQuantitySample] else {         fatalError("*** An error occurred during the initial query: \(errorOrNil!.localizedDescription) ***")       }       if let anchor = newAnchor {         do {           let data = try NSKeyedArchiver.archivedData(withRootObject: anchor as Any, requiringSecureCoding: false)           UserDefaults.standard.set(data, forKey: anchorKey)         } catch {           print("Error retreiving anchor from UserDefaults")         }       }       completion(samples.last, nil)     }           // Setting up long-running query     query.updateHandler = { (query, samplesOrNil, _, newAnchor, errorOrNil) in       guard let samples = samplesOrNil as? [HKQuantitySample] else {         fatalError("*** An error occurred during an update: \(errorOrNil!.localizedDescription) ***")       }       if let anchor = newAnchor {         do {           let data = try NSKeyedArchiver.archivedData(withRootObject: anchor as Any, requiringSecureCoding: false)           UserDefaults.standard.set(data, forKey: anchorKey)         } catch {           print("Error retreiving anchor from UserDefaults")         }       }       if let sample = samples.last {         updateHandler(sample, nil)       }     }     self.healthStore.execute(query)   }
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0
1.2k
Mar ’25
HKWorkoutSession.sendToRemoteWorkoutSession doesn't report success or failure
We are seeing an issue where sending data using the asynchronous method HKWorkoutSession.sendToRemoteWorkoutSession(data: Data) will never return in some cases (no success nor failure). This issue is happening for roughly 5% of Workouts started and will stay broken for the whole workout. The other 95% of the workouts, the connection works flawlessly. This happens on both watchOS 10 and 11, and with phones running iOS 17 or 18. The issue is quite random and not reproducible. Our app has thousands of workouts a day that use the workout session workout data send, with constant messages being send every few seconds. In some of those 5% cases the "sendToRemoteWorkoutSession" will throw way later, like 30+ minutes later, if the watch app is awake long enough to capture a log of a failure. Our code uses the same flow as in the sample project: https://developer.apple.com/documentation/healthkit/workouts_and_activity_rings/building_a_multidevice_workout_app Here is some sample code, which is pretty simple. Setup code: let workoutSession = try HKWorkoutSession(healthStore: healthStore, configuration: configuration) workoutSession.delegate = self activeWorkoutSession?.startMirroringToCompanionDevice { success, error in print("Mirroring started on companion device: \(success), error: \(error)") } workoutSession?.prepare() then later we send data using the workout session: do { print("Will send data") try await workoutSession.sendToRemoteWorkoutSession(data: data) print("Successfully sent data") // This nor the error may be called after waiting extensive amounts of time } catch { print("Failed to send data, error: \(error)") // This nor the success may be called after waiting extensive amounts of time } So far, the only fix is to restart the phone and watch at the same time, which is not a great user experience. Is anyone else seeing this issue? or know how to fix this issue?
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601
5d
HealthKit SDK Not Responding When Querying Step Data on iPhone 16 Pro Max
We have working code to fetch step data from HealthKit after requesting the necessary permissions. However, we’ve encountered an issue specific to one device, the iPhone 16 Pro Max. When querying the data, we do not receive a response, and the code enters an infinite loading state without completing the request. The user who is facing this issue has tried logging in on another device, and it works fine. On the problematic device (iPhone 16 Pro Max), the request does not complete. For reference, I’ve included the code below. Resolving this issue is crucial, so we would appreciate any guidance on what steps we can take to troubleshoot or resolve the problem on this specific device. Please note that the device has granted permission to access HealthKit data. static let healthStore = HKHealthStore() static func limitReadFromHealthKitBetweenDates(fromDate: Date, toDate: Date = Date(), completion: @escaping ([HKStatistics]) -> Void) { guard let stepsQuantityType = HKQuantityType.quantityType(forIdentifier: .stepCount) else { return } let ignoreUserEntered = HKQuery.predicateForObjects(withMetadataKey: HKMetadataKeyWasUserEntered, operatorType: .notEqualTo, value: true) let now = toDate var interval = DateComponents() interval.day = 1 var calendar = Calendar.current calendar.locale = Locale(identifier: "en_US_POSIX") var anchorComponents = calendar.dateComponents([.day, .month, .year], from: now) anchorComponents.hour = 0 let anchorDate = calendar.date(from: anchorComponents) ?? Date() let query = HKStatisticsCollectionQuery(quantityType: stepsQuantityType, quantitySamplePredicate: ignoreUserEntered, options: [.cumulativeSum], anchorDate: anchorDate, intervalComponents: interval) query.initialResultsHandler = { _, results, error in guard let results = results else { print("Error returned from resultHandler: \(String(describing: error?.localizedDescription))") return } print(results) var statisticsArray: [HKStatistics] = [] results.enumerateStatistics(from: fromDate, to: now) { statistics, _ in statisticsArray.append(statistics) if statistics.endDate.getddmmyyyyslashGMT == now.getddmmyyyyslashGMT { completion(statisticsArray) } } } healthStore.execute(query) } Please note that the code works on all devices except the problematic one. Could you please guide me on the next steps to resolve this issue?
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927
Dec ’24
Workout not showing for import on Strava
I have a workout app which I am testing on device currently via TestFlight. The generated workout (tennis and indoor) shows in the fitness app with correct HR and duration. However, when I go to my Strava app, it does not show in the list of workouts for importing. (note, activities tracked using the regular tennis mode on the Apple Watch show fine) I have also concurrently reached out to Strava support to see if there's anything they can offer support for. However, does anybody here have any knowledge/experience of the requirement? Or whether this is a limitation of an application deployed via TestFlight? I have a terrible feeling I am chasing ghosts, and it may be a TestFlight limitation for exporting workouts? Thanks
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894
Jan ’25
Apple Healthkit data usage
I want to use the Apple Healthkit data to recommend personalised insurance. Is this allowed? As I have read in the documentation that the Apple Healthkit data can only be used for fitness and health purposes. Anyone knows what is meant / scope of "fitness and health purposes"? Will personalised insurance as per health data be allowed under this category?
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392
Jan ’25
Workouts fail to register on Fitness activity rings
Hello, My app syncs workout data from a third-party device and records workouts with HealthKit as follows: let builder = HKWorkoutBuilder(healthStore: healthStore, configuration: hkConf, device: hkDevice) try await builder.beginCollection(at: startDate) try await builder.addSamples(samples) try await builder.endCollection(at: endDate) let workout = try await builder.finishWorkout() let workoutRouteBuilder = HKWorkoutRouteBuilder(healthStore: healthStore, device: hkDevice) try await workoutRouteBuilder.insertRouteData(filteredLocations) try await workoutRouteBuilder.finishRoute(with: workout, metadata: nil) However, I’m encountering two issues: The workouts appear in Apple Fitness but do not contribute to the activity rings. The workout includes a route (visible in the raw workout data in Apple Health) but does not display on Apple Fitness. Is there any way to fix this? I’d appreciate any suggestions you might have. __
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766
Jan ’25
Apple Watch Ultra 2 having issues with heart rate measurements
I am using a new Apple Watch Ultra 2 (MX5R3LW/A) running WatchOS 11.3 (22S553). I noticed that the watch often misses heart measurements during meaningfully long segments of exercise sessions. This has been bugging me for a while and today I read an article that described perfectly, and much better than I could, what I am experiencing. Here is the article: https://apple.news/AK_QJyoLaQ1eaeySWHlkLPw Is this a known issue that is being worked? Thanks.
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811
Jan ’25
Extended Runtime Session vs HKWorkoutSession Issues
I am working on an Apple Watch companion app to an existing live iOS app. I am utilizing the heart rate tracking for an active 'self-care' sauna session. I say self-care in quotes because it's more self-care than a workout activity, but it is closely blurring the lines between the two. I have come to understand that if a session truly isn't a workout, then you should not use workoutSession.startActivity. However the app needs to function entirely like a workout would. This is not a meditation application. Sauna is actually just one of many activity types supported in the app. I have tried using extended runtime session, and there have been numerous issues with doing so. It is not nearly as robust for the user. For example, the active session is not prioritized by the watch's CPU. Now playing is no longer functional. Heart rate is far more inconsistent, and this variable is as critical as if it were in a workout. I have tried using HKWorkoutSession, however I worry the app will be rejected by doing so. This method works most accurately to collect the right data for the user, and prioritizes system resources as expected. The app can be moved to the background as expected and continue to communicate with the iOS app. What is the best way to move forward here. It almost feels like I am operating in a grey area with no real solution in place. Any assistance is greatly appreciated as we would like to follow all guidelines while producing a high quality experience for our users.
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813
Jan ’25
Workout Types to be Added to Apple Watch
Dear Apple Developers, Could you kindly add the two following workout types to your Apple Watch? There are large communities that participate in both of these activities globally. Rucking workout option. goruck.com TRX suspension trainer option. trxtraining.com Thank you for your consideration. This addition will make many people happy.
1
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360
Jan ’25
HKHealthStore().execute(query) will block main thread
HKHealthStore().execute(query) run in main thread it cost 3.5s here is my code print("execute begin:(Date().timeIntervalSince1970)") HKHealthStore().execute(query) print("execute end:(Date().timeIntervalSince1970)") query.predicate like this (startDate >= CAST(0.000000, "NSDate") AND endDate < CAST(0.100000, "NSDate") AND startDate < CAST(0.100000, "NSDate")) OR (startDate >= CAST(60.000000, "NSDate") AND endDate < CAST(60.100000, "NSDate") AND startDate < CAST(60.100000, "NSDate")) OR (startDate >= CAST(120.000000, "NSDate") AND endDate < CAST(120.100000, "NSDate") AND startDate < CAST(120.100000, "NSDate")) OR (startDate >= CAST(180.000000, "NSDate") AND endDate < CAST(180.100000, "NSDate") AND startDate < CAST(180.100000, "NSDate")) OR (startDate >= CAST(240.000000, "NSDate") AND endDate < CAST(240.100000, "NSDate") AND startDate < CAST(240.100000, "NSDate")) OR (startDate >= CAST(300.000000, "NSDate") AND endDate < CAST(300.100000, "NSDate") AND startDate < CAST(300.100000, "NSDate")) OR (startDate >= CAST(360.000000, "NSDate") AND endDate < CAST(360.100000, "NSDate") AND startDate < CAST(360.100000, "NSDate")) OR (startDate >= CAST(420.000000, "NSDate") AND endDate < CAST(420.100000, "NSDate") AND startDate < CAST(420.100000, "NSDate")) OR (startDate >= CAST(480.000000, "NSDate") AND endDate < CAST(480.100000, "NSDate") AND startDate < CAST(480.100000, "NSDate")) OR (startDate >= CAST(540.000000, "NSDate") AND endDate < CAST(540.100000, "NSDate") AND startDate < CAST(540.100000, "NSDate")) OR (startDate >= CAST(600.000000, "NSDate") AND endDate < CAST(600.100000, "NSDate") AND startDate < CAST(600.100000, "NSDate")) OR (startDate >= CAST(660.000000, "NSDate") AND endDate < CAST(660.100000, "NSDate") AND startDate < CAST(660.100000, "NSDate")) OR (startDate >= CAST(720.000000, "NSDate") AND endDate < CAST(720.100000, "NSDate") AND startDate < CAST(720.100000, "NSDate")) OR (startDate >= CAST(780.000000, "NSDate") AND endDate < CAST(780.100000, "NSDate") AND startDate < CAST(780.100000, "NSDate")) OR (startDate >= CAST(840.000000, "NSDate") AND endDate < CAST(840.100000, "NSDate") AND startDate < CAST(840.100000, "NSDate")) OR (startDate >= CAST(900.000000, "NSDate") AND endDate < CAST(900.100000, "NSDate") AND startDate < CAST(900.100000, "NSDate")) OR (startDate >= CAST(960.000000, "NSDate") AND endDate < CAST(960.100000, "NSDate") AND startDate < CAST(960.100000, "NSDate")) OR (startDate >= CAST(1020.000000, "NSDate") AND endDate < CAST(1020.100000, "NSDate") AND startDate < CAST(1020.100000, "NSDate")) OR (startDate >= CAST(1080.000000, "NSDate") AND endDate < CAST(1080.100000, "NSDate") AND startDate < CAST(1080.100000, "NSDate")) OR (startDate >= CAST(1140.000000, "NSDate") AND endDate < CAST(1140.100000, "NSDate") AND startDate < CAST(1140.100000, "NSDate")) OR (startDate >= CAST(1200.000000, "NSDate") AND endDate < CAST(1200.100000, "NSDate") AND startDate < CAST(1200.100000, "NSDate")) OR (startDate >= CAST(1260.000000, "NSDate") AND endDate < CAST(1260.100000, "NSDate") AND startDate < CAST(1260.100000, "NSDate")) OR (startDate >= CAST(1320.000000, "NSDate") AND endDate < CAST(1320.100000, "NSDate") AND startDate < CAST(1320.100000, "NSDate")) OR (startDate >= CAST(1380.000000, "NSDate") AND endDate < CAST(1380.100000, "NSDate") AND startDate < CAST(1380.100000, "NSDate")) OR (startDate >= CAST(1440.000000, "NSDate") AND endDate < CAST(1440.100000, "NSDate") AND startDate < CAST(1440.100000, "NSDate")) OR (startDate >= CAST(1500.000000, "NSDate") AND endDate < CAST(1500.100000, "NSDate") AND startDate < CAST( Log execute begin:1739958803.531026 execute end:1739958807.0448961
3
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644
Feb ’25
Walking/Running Distance not included in daily total
Hi, I have an iPhone/watch app that measures walking/running distance. It starts a workout session records data successfully into healthkit and then ends the workout session. I can see the data in the Health app from my app and it all appears to be correct. The issue I'm having is that the Health app doesn't use my app's data in its total distance for the day. For example, I can add 1 mile of fake data (I know that's not allowed per policy) for testing and it gets successfully added but not used in the total. The health app is only using distances collected by the watch and the phone for calculating the total distance for the day and is ignoring the distance provided by my app. What could I be missing?
2
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685
Feb ’25
Request for Guidance on Cross-Platform Heart Rate Data Sharing
Dear Apple Developer Support, I hope this message finds you well. I am reaching out for guidance on a project that involves sharing heart rate data between an iOS app and an Android app. I have developed a watchOS app that continuously fetches heart rate data from an Apple Watch and displays it in a companion iOS app. Additionally, I have built an Android fitness app using Ionic Angular. My goal is to create a bridge that allows the heart rate data from the iOS app to be displayed continuously in the Android app. I am considering using a backend server (e.g., Node.js) to facilitate this data transfer. Could you please provide any insights or recommendations on the best approach for achieving this cross-platform data sharing? I would appreciate any guidance on potential challenges or limitations I might encounter. Thank you for your time and assistance. Sincerely, Venu Madhav
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486
Feb ’25