I keep seeing a red action item to complete a task in settings. IOS beta keeps indicating that I need to enable sensor & usage data. Everything is enabled. I literally enabled everything to get it to go away, but it is still there. Suggestions?
Health & Fitness
RSS for tagExplore the technical aspects of health and fitness features, including sensor data acquisition, health data processing, and integration with the HealthKit framework.
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I implemented this to receive updates for specific data types and keep the latest daily information up to date. However, for some reason, it only works for a while before stopping completely.
Background Delivery
internal func backgroundDeliveryForReadTypes(enable: Bool, types: Set<HKQuantityType>) async {
do {
if enable {
try await statusForAuthorizationRequest(toWrite: [], toRead: types)
for type in types {
try await healthStore.enableBackgroundDelivery(for: type, frequency: .daily)
}
} else {
for type in types {
try await healthStore.disableBackgroundDelivery(for: type)
}
}
} catch {
debugPrint("Error enabling background delivery: \(error.localizedDescription)")
}
}
HKQueryAnchor
internal var walkingActivityQueryAnchor: HKQueryAnchor? {
get {
if let anchorData = UserDefaults.standard.data(forKey: "walkingActivityAnchor") {
return try? NSKeyedUnarchiver.unarchivedObject(ofClass: HKQueryAnchor.self, from: anchorData)
}
return nil
}
set {
if let newAnchor = newValue {
let anchorData = try? NSKeyedArchiver.archivedData(withRootObject: newAnchor, requiringSecureCoding: true)
UserDefaults.standard.set(anchorData, forKey: "walkingActivityAnchor")
} else {
UserDefaults.standard.removeObject(forKey: "walkingActivityAnchor")
}
}
}
HKAnchoredObjectQuery
internal func observeWalkingActivityInBackground(
_ start: Bool,
toRead: Set<HKQuantityType>,
completion: @escaping @Sendable (Result<WalkingActivityData?, Error>) -> Void
) {
if start {
guard (walkingActivityQuery == nil) else {
return
}
let predicate = getPredicate(date: Date())
let queryDescriptors = toRead.map {
HKQueryDescriptor(sampleType: $0, predicate: predicate)
}
let handleSamples: @Sendable (HKAnchoredObjectQuery, [HKSample]?, [HKDeletedObject]?, HKQueryAnchor?, Error?) -> Void = { [weak self] _, samples, _, newAnchor, error in
guard let self = self else { return }
if let error = error {
completion(.failure(error))
return
}
guard let samples = samples, !samples.isEmpty else {
completion(.success(nil))
return
}
Task {
self.walkingActivityQueryAnchor = newAnchor
let activity = await self.getWalkingActivity(date: Date())
completion(.success(activity))
}
}
let query = HKAnchoredObjectQuery(
queryDescriptors: queryDescriptors,
anchor: walkingActivityQueryAnchor,
limit: HKObjectQueryNoLimit,
resultsHandler: handleSamples
)
query.updateHandler = handleSamples
healthStore.execute(query)
walkingActivityQuery = query
} else {
if let query = walkingActivityQuery {
healthStore.stop(query)
walkingActivityQuery = nil
}
}
}
WalkingActivityData
private func getWalkingActivity(date: Date) async -> WalkingActivityData {
async let averageHeartRate = try await self.getAverageHeartRate(date: date)
async let steps = try self.getStepCount(date: date)
async let durationMinutes = try self.getTotalDurationInMinutes(date: date)
async let distanceMeters = try self.getDistanceWalkingRunning(date: date, unit: .meter())
async let activeCalories = try self.getActiveEnergyBurned(date: date)
return await WalkingActivityData(
date: date,
steps: try? steps,
activeCalories: try? activeCalories,
distanceMeters: try? distanceMeters,
durationMinutes: try? durationMinutes,
averageHeartRate: try? averageHeartRate
)
}
Example of getAverageHeartRate
func getAverageHeartRate(date: Date) async throws -> Double? {
let type = HKQuantityType(.heartRate)
_ = try checkAuthorizationStatus(for: type)
guard let heartRate = try await getDescriptor(
date: date,
type: type,
options: .discreteAverage
).result(for: healthStore)
.statistics(for: date)?
.averageQuantity()?.doubleValue(for: HKUnit.count().unitDivided(by: HKUnit.minute()))
else {
return nil
}
return Double(String(format: "%.2f", heartRate)) ?? 0.0
}
Descriptor & predicate
internal func getPredicate(startDate: Date, endDate: Date) -> NSCompoundPredicate {
let predicateForSamples = HKQuery.predicateForSamples(withStart: startDate, end: endDate)
let excludeManual = NSPredicate(format: "metadata.%K != YES", HKMetadataKeyWasUserEntered)
return NSCompoundPredicate(andPredicateWithSubpredicates: [predicateForSamples, excludeManual])
}
internal func getDescriptor(startDate: Date, endDate: Date, type: HKQuantityType, options: HKStatisticsOptions) -> HKStatisticsCollectionQueryDescriptor {
let calendar = Calendar(identifier: .gregorian)
let anchorDate = calendar.date(bySetting: .hour, value: 0, of: startDate)!
var interval = DateComponents()
interval.day = 1
return HKStatisticsCollectionQueryDescriptor(
predicate: HKSamplePredicate.quantitySample(type: type, predicate: getPredicate(startDate: startDate, endDate: endDate)),
options: options,
anchorDate: anchorDate,
intervalComponents: interval
)
}
Implementation
public func observeWalkingActivityInBackground(_ start: Bool, toRead: Set<HKQuantityType>, memberID: String) {
observeWalkingActivityInBackground(start, toRead: toRead) { [weak self] result in
guard let self = self else { return }
}
}
This is an ongoing issue that I haven't been able to solve:
I am querying different types of HealthKit data over the past year. While this works fine for HRV, it hangs for some users when I'm trying to get heart rate data.
Here's the relevant query
func initialRead(from startDate: Date) async throws -> [HKSample] {
let endDate = anchorStart
let interval: TimeInterval = .days(7)
var currentStartDate = startDate
var currentEndDate = Date(timeInterval: interval, since: currentStartDate)
var samples: [HKSample] = []
while currentStartDate <= endDate {
let datePredicate = SampleType.datePredicate(start: currentStartDate, end: currentEndDate)
let predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [datePredicate,HKQuery.predicateForObjects(withMetadataKey: HKMetadataKeyHeartRateMotionContext, allowedValues: [HKHeartRateMotionContext.sedentary])])
do {
let result = try await withCheckedThrowingContinuation { continuation in
let completionQuery = HKSampleQuery(sampleType: HKQuantityType.heartRate, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: [.init(key: HKSampleSortIdentifierStartDate, ascending: true)]) { query, samples, error in
if let samples {
continuation.resume(returning: samples)
} else {
if let error {
continuation.resume(throwing: error)
} else {
continuation.resume(returning: [])
}
}
}
healthStore.execute(completionQuery)
}
samples = samples.merge(from: result)
} catch {
Logger.general.error("Reading failed for dates \(currentStartDate) to \(currentEndDate): \(error)")
}
currentStartDate = currentEndDate
currentEndDate = Date(timeInterval: interval, since: currentStartDate)
}
return samples
}
extension HKSampleType {
static func datePredicate( start:Date?, end:Date?) -> NSPredicate {
HKQuery.predicateForSamples(withStart: start, end:end, options: .strictStartDate)
}
}
For reference, I expect about 1000 sedentary samples per week. Basically what happens for these users is when they start reading the HR data, the app hangs. They start each read manually via a special TestFlight build with buttons for starting the different data type readings.
Any advice on how to proceed with this bug would be great since it only affects some users.
I am able to create test builds for this audience to test different options. One theory is the motion context predicate is screwing something up. If any apple dev can enlighten me how to narrow down the issue, that would be great.
We are developing a mobile app focused on lone worker protection, which does not include any fitness tracking features.
We require the use of HKWorkoutSession solely to enable background execution of critical safety-related code.
Could you please confirm whether this use of HKWorkoutSession is permitted under App Store Review guidelines, given that our app does not offer fitness or workout-related functionality?
I am trying to track a user's real-time sleep state using heart rate data, but I have encountered several issues:
When using HKSampleQuery on the phone to fetch heart rate data, I can only retrieve data recorded before the app comes to the foreground or before it is terminated and restarted (see related issue: https://developer.apple.com/forums/thread/774953).
I attempted to get data on the Apple Watch and send updates to the phone via Watch Connectivity. However, if I use WKExtendedRuntimeSession, although I can obtain data on the watch, once the watch screen goes off, it can no longer transmit data via Watch Connectivity to the phone (since I cannot guarantee the app will remain in the foreground when lying in bed).
On the other hand, using HKWorkoutSession results in interference with the activity rings and causes the heart rate sensor to run too frequently, which I worry may affect the battery life of the watch.
Is there an elegant solution for tracking a user's heart rate data for sleep monitoring?
I am currently developing an app that measures HRV to estimate stress levels.
To align the values more closely with those from Galaxy devices, I decided not to use the heartRateVariabilitySDNN value provided by HealthKit.
Instead, I extracted individual interbeat intervals (IBI) using the HKHeartBeatSeries data.
Can I obtain accurate IBI data using this method?
If not, I would like to know how I can retrieve more precise data.
Any insights or suggestions would be greatly appreciated.
Here is a sample code I tried.
@Observable
class HealthKitManager: ObservableObject {
let healthStore = HKHealthStore()
var ibiValues: [Double] = []
var isAuthorized = false
func requestAuthorization() {
let types = Set([
HKSeriesType.heartbeat(),
HKQuantityType.quantityType(forIdentifier: .heartRateVariabilitySDNN)!,
])
healthStore.requestAuthorization(toShare: nil, read: types) { success, error in
DispatchQueue.main.async {
self.isAuthorized = success
if success {
self.fetchIBIData()
}
}
}
}
func fetchIBIData() {
var timePoints: [TimeInterval] = []
var absoluteStartTime: Date?
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(identifier: "Asia/Seoul")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
var calendar = Calendar.current
calendar.timeZone = TimeZone(identifier: "Asia/Seoul") ?? .current
var components = DateComponents()
components.year = 2025
components.month = 4
components.day = 3
components.hour = 15
components.minute = 52
components.second = 0
let startTime = calendar.date(from: components)!
components.hour = 16
components.minute = 0
let endTime = calendar.date(from: components)!
let predicate = HKQuery.predicateForSamples(withStart: startTime,
end: endTime,
options: .strictStartDate)
let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierStartDate, ascending: false)
let query = HKSampleQuery(sampleType: HKSeriesType.heartbeat(),
predicate: predicate,
limit: HKObjectQueryNoLimit,
sortDescriptors: [sortDescriptor]) { (_, samples, _) in
if let sample = samples?.first as? HKHeartbeatSeriesSample {
absoluteStartTime = sample.startDate
let startDateKST = dateFormatter.string(from: sample.startDate)
let endDateKST = dateFormatter.string(from: sample.endDate)
print("series start(KST):\(startDateKST)\tend(KST):\(endDateKST)")
let seriesQuery = HKHeartbeatSeriesQuery(heartbeatSeries: sample) {
query, timeSinceSeriesStart, precededByGap, done, error in
if !precededByGap {
timePoints.append(timeSinceSeriesStart)
}
if done {
for i in 1..<timePoints.count {
let ibi = (timePoints[i] - timePoints[i-1]) * 1000 // Convert to milliseconds
// Calculate absolute time for current beat
if let startTime = absoluteStartTime {
let beatTime = startTime.addingTimeInterval(timePoints[i])
let beatTimeString = dateFormatter.string(from: beatTime)
print("IBI: \(String(format: "%.2f", ibi)) ms at \(beatTimeString)")
}
self.ibiValues.append(ibi)
}
}
}
self.healthStore.execute(seriesQuery)
} else {
print("No samples found for the specified time range")
}
}
self.healthStore.execute(query)
}
}
Hi,
I’m currently working on an app that utilizes sleep data from HealthKit to provide users with meaningful insights about their sleep.
To ensure a smooth user experience, I’d like to understand when sleep data collected by the Apple Watch is saved to the HealthKit store and when it gets synced to the iPhone.
Ideally, I want to fetch sleep data right after the user wakes up and opens our app. However, to do this reliably, I need to know the timing of how and when this data becomes available in the iPhone’s HealthKit store.
I’ve looked through the official documentation and relevant WWDC sessions but couldn’t find clear information on this topic.
If anyone has insights or experience with how and when the Apple Watch syncs HealthKit data—especially sleep records—to the iPhone, I’d greatly appreciate your input.
Thanks!
Hello,
I’m developing an iOS app that works with sleep data from Apple Watch via HealthKit. I would like to clarify the following:
How can an iPhone app detect when a sleep session ends on the Apple Watch?
When is sleep data typically written to the HealthKit store on iPhone after sleep ends? Is it immediately after wake-up, or does it depend on certain conditions (e.g., watch charging, connectivity)?
Understanding the timing and mechanism of sleep data synchronization is crucial for our app to process accurate and timely health information.
Thank you for your assistance.
I want to know , how many days will the data of health stays in apple watch . For example, I have not synced the watch with iPhone for two weeks . Then When I synced it , I am only able to see the last week data on iPhone of the watch . Is it true ?
Hello, is there a way to present WorkoutPlan preview just like it was presented on WWDC video: https://developer.apple.com/videos/play/wwdc2023/10016/
with WorkoutCompositions?
Or was this way ditched completely and is not possible to reproduce anymore? I find it weird that this view modifier accepts non-optional WorkoutPlan when the process of creating one can fail for many reasons with fatalError (that's another issue - why isn't there throws used anywhere?) when not checked with dedicated methods and I think that it would make more sense to create WorkoutPlan when user completes filling some kind of form. Because right now it's needed to compute the non-optional WorkoutPlan for the sake of .workoutPreview modifier live for any changes and that can often lead to errors.
Non-modifier way of presenting the preview, like the one presented on WWDC would work really well for my project
The recent WWDC presentation on HealthKit demonstrated how to associate side effects with a medication dose using HKObjectType.categoryType(forIdentifier:) and HKCategorySample, a subclass of HKObject.
There also appears to be an object type specifically for medication doses: HKMedicationDoseEventType, accessible via HKObjectType.medicationDoseEventType(). However, there’s no corresponding public subclass of HKObject that supports this identifier. The most relevant class, HKMedicationDoseEvent, exists but has an inaccessible initializer.
Is there currently a supported way to use HKMedicationDoseEventType, or is this functionality not yet available?
https://developer.apple.com/videos/play/wwdc2025/321/
I don’t get the workout buddy on my Apple Watch series 10, paired to an iPhone 16 running iOS 26 Beta 2
Topic:
App & System Services
SubTopic:
Health & Fitness
Has anyone seen the workout buddy options on watch OS yet? I am not able to get it on my watch.
My setup is an iPhone 16 and Watch Ultra 1 with the 26 OS
I am currently using beta 3.
English US language on both and US as region.
I am located in Germany though.
I restarted both devices multiple times without any changes.
Hopefully someone can help.
Topic:
App & System Services
SubTopic:
Health & Fitness
Tags:
Health and Fitness
watchOS
Apple Watch
WorkoutKit
In iOS 26, HKLiveWorkoutBuilder is supported, which we can use like HKWorkoutSession in watchOS - this is very exciting.
However, it currently seems to have a bug in calculating calories.
I tested it in my app, and for nearly 6 minutes with an average heart rate of 134, it only calculated 8 calories consumed (80 calories per hour), including basal consumption, which is obviously incorrect.
(I used Powerboats Pro 2 connected to my phone, which includes heart rate data, and HKLiveWorkoutBuilder correctly collected the heart rate, which is great.)
I think my code is correct.
func workoutBuilder(_ workoutBuilder: HKLiveWorkoutBuilder, didCollectDataOf collectedTypes: Set<HKSampleType>) {
for type in collectedTypes {
guard let quantityType = type as? HKQuantityType else {
return // Nothing to do.
}
let statistics = workoutBuilder.statistics(for: quantityType)
if let statistics = statistics {
switch statistics.quantityType {
case HKQuantityType.quantityType(forIdentifier: .heartRate):
/// - Tag: SetLabel
let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
let value = statistics.mostRecentQuantity()?.doubleValue(for: heartRateUnit)
let roundedValue = Double( round( 1 * value! ) / 1 )
if let avg = statistics.averageQuantity()?.doubleValue(for: heartRateUnit) {
self.avgHeartRate = avg
}
self.delegate?.didUpdateHeartBeat(self, heartBeat: Int(roundedValue))
case HKQuantityType.quantityType(forIdentifier: .activeEnergyBurned):
let energyUnit = HKUnit.kilocalorie()
let value = statistics.sumQuantity()?.doubleValue(for: energyUnit)
self.totalActiveEnergyBurned = Double(value!)
print("didUpdate totalActiveEnergyBurned: \(self.totalActiveEnergyBurned)")
self.delegate?.didUpdateEnergyBurned(self, totalEnergy: self.totalActiveEnergyBurned + self.totalBasalEneryBurned)
return
case HKQuantityType.quantityType(forIdentifier: .basalEnergyBurned):
let energyUnit = HKUnit.kilocalorie()
let value = statistics.sumQuantity()?.doubleValue(for: energyUnit)
self.totalBasalEneryBurned = Double(value!)
print("didUpdate totalBasalEneryBurned: \(self.totalBasalEneryBurned)")
self.delegate?.didUpdateEnergyBurned(self, totalEnergy: self.totalActiveEnergyBurned + self.totalBasalEneryBurned)
return
default:
print("unhandled quantityType=\(statistics.quantityType) when processing statistics")
return
}
}
I think I've found the source of the problem:
let workoutConfiguration = HKWorkoutConfiguration()
workoutConfiguration.activityType = .traditionalStrengthTraining //walking, running is ok
workoutConfiguration.locationType = .outdoor
When I set the activityType to walking or running, the calorie results are correct, showing several hundred calories per hour.
However, when activityType is set to traditionalStrengthTraining or jumprope, the calculations are incorrect.
PS:
I'm currently using Xcode 26 beta3 and iOS 26 beta3.
Hope this issue can be resolved. Thanks.
I updated my watch to take advantage of the reactivated blood oxygen/O2 function, but with my iPhone on public beta 3, it still shows unavailable. Will there be an update to beta three to allow this newly reactivated Apple Watch feature to function?
Hello. I have implemented background delivery for detecting changes in health kit with HKObserverQuery. It works well, I am reading changes. And I am sending this changes to an https endpoint with using an URLSession.shared.dataTask inside the HKObserverQuery callback while my app is terminated. I have several questions about this:
Is starting a URLSession.shared.dataTask inside HKObserverQuery callback is correct way to do it?
I am calling HKObserverQuery completion handler whatever dataTask returned success or failure but I am wondering what if the network connection is low and this dataTask response could not received in 2-3 seconds. I have read HealthKit background deliveries should take 1-2 seconds.
Should I use background task somehow for sending those HTTPS requests?
I'm a bit confused as to what we're supposed to be doing to support starting a workout using Siri in iOS/watchOS 26. On one hand, I see a big push to move towards App Intents and shortcuts rather than SiriKit. On the other hand, I see that some of the things I would expect to work with App Intents well... don't work. BUT - I'm also not sure it isn't just developer error on my part.
Here are some assertions that I'm hoping someone more skilled and knowledgable can correct me on:
Currently the StartWorkoutIntent only serves the Action button on the Watch Ultra. It cannot be used to register Shortcuts, nor does Siri respond to it.
I can use objects inherited from AppIntent to create shortcuts, but this requires an additional permission to run a shortcut if a user starts a workout with Siri.
AppIntent shortcuts requires the user to say "Start a workout in " - if the user leaves out the "in " part, Siri will not prompt the user to select my app.
If I want to allow the user to simply say "Start a Workout" and have Siri prompt the user for input as to which app it should use, I must currently use the older SiriKit to do so.
Are these assertions correct - or am I just implementing something incorrectly?
Using the latest Xcode 26 beta for what it is worth.
Topic:
App & System Services
SubTopic:
Health & Fitness
Tags:
Siri and Voice
SiriKit
Intents
App Intents
Hello, everyone!
I'm seeking some guidance on the App Store review process and technical best practices for a watchOS app.
My goal is to create an app that uses HealthKit to continuously monitor a user's heart rate in the background for sessions lasting between 30 minutes and 3 hours. This app would not be a fitness or workout tracker.
My primary question is about the best way to achieve this reliably while staying within the App Store Review Guidelines.
Is it advisable to use the WorkoutKit framework to start a custom, non-fitness "session" for the purpose of continuous background monitoring?
Are there any other recommended APIs or frameworks for this kind of background data collection on watchOS that I should be aware of?
What are the key review considerations I should be mindful of, particularly regarding Guideline 4.1 (Design) and the intended use of APIs?
My app's core functionality would require this kind of data for a beneficial purpose. I want to ensure my approach is technically sound and has the best chance of a successful review.
Any insights or advice from developers who have experience with similar use cases would be incredibly helpful!
Thank you!
Topic:
App & System Services
SubTopic:
Health & Fitness
Tags:
SensorKit
Health and Fitness
watchOS
Watch Complications
Hello -
I'm wondering about the suggested apps listed by Apple in their Health app. For example, if you select the "Sleep" category there are a bunch of suggested apps like AutoSleep and Sleepzy. These are not Sleep apps that I installed on my own phone or ever shared sleep data with.
Is there a way to request to have a relevant app shown there? Or is it more automatic, like you're an app that integrates with HealthKit in certain ways and Apple has a way of determining that app is suitable for the user (ex. App Store popularity, user behavior, etc.)
Health medications appearing on apple watch is still broken. After entering medications in health app with health notification on. The medications does not appear in the Apple Watch.
Topic:
App & System Services
SubTopic:
Health & Fitness