I'm using Healthkit with the following H/W specs:
Apple Watch, series 8, OS: 10.6.1 (21U580)
iPhone 11 Pro, OS: 17.6.1
Mac Studio M1
Xcode ver: 16.0 (16A242d)
I am trying to get Apple Watch to report heart rate, HRV, respiratory rate, and body temperature using Healthkit's HKLiveWorkoutBuilder implementing HKLiveWorkoutBuilderDelegate's workoutBuilder method. However, the only reported value that is found from the workoutBuilder method's collectedTypes (a Set of HKSampleType objects) is HKQuantityTypeIdentifierHeartRate. Nothing for HRV, respiratory rate, or body temperature. All entitlements are set up, the plist filled in, and capabilities in place. Not sure why only the heart rate is reported from the watch but nothing else.
I've scoured StackOverflow, Apple developer forums, even ChatGPT but none of the solutions work.
Any help most appreciate!
The model code is:
import Foundation
import HealthKit
class WatchModel: NSObject, HKLiveWorkoutBuilderDelegate, HKWorkoutSessionDelegate {
private let healthStore = HKHealthStore()
private var workoutSession: HKWorkoutSession!
private var workoutBuilder: HKLiveWorkoutBuilder!
override init() {
super.init()
requestAuthorization()
startWorkoutSession()
}
private func requestAuthorization() {
let heartRateType = HKQuantityType.quantityType(forIdentifier: .heartRate)!
let respiratoryRateType = HKQuantityType.quantityType(forIdentifier: .respiratoryRate)!
let HRVRateType = HKQuantityType.quantityType(forIdentifier: .heartRateVariabilitySDNN)!
let temperatureRateType = HKQuantityType.quantityType(forIdentifier: .bodyTemperature)!
let healthDataTypes: Set = [heartRateType, respiratoryRateType, HRVRateType, temperatureRateType]
healthStore.requestAuthorization(toShare: healthDataTypes, read: healthDataTypes) { (success, error) in
if !success {
print("Authorization failed")
}
}
}
func workoutSession(_ workoutSession: HKWorkoutSession, didChangeTo toState: HKWorkoutSessionState, from fromState: HKWorkoutSessionState, date: Date) {
}
func workoutSession(_ workoutSession: HKWorkoutSession, didFailWithError error: any Error) {
}
func workoutBuilderDidCollectEvent(_ workoutBuilder: HKLiveWorkoutBuilder) {
}
func startWorkoutSession() {
let configuration = HKWorkoutConfiguration()
configuration.activityType = .other
configuration.locationType = .indoor
do {
workoutSession = try HKWorkoutSession(healthStore: healthStore, configuration: configuration)
workoutBuilder = workoutSession.associatedWorkoutBuilder()
workoutBuilder.delegate = self
workoutBuilder.dataSource = HKLiveWorkoutDataSource(healthStore: healthStore, workoutConfiguration: configuration)
let dataSource = HKLiveWorkoutDataSource(healthStore: healthStore, workoutConfiguration: configuration)
let respiratoryRate = HKQuantityType(.respiratoryRate)
dataSource.enableCollection(for: respiratoryRate, predicate: nil)
let bodyTemp = HKQuantityType(.bodyTemperature)
dataSource.enableCollection(for: bodyTemp, predicate: nil)
let hrv = HKQuantityType(.heartRateVariabilitySDNN)
dataSource.enableCollection(for: hrv, predicate: nil)
workoutSession.delegate = self
workoutSession.startActivity(with: Date())
workoutBuilder.beginCollection(withStart: Date(), completion: { (success, error) in
if let error = error {
print("Error starting collection: \(error.localizedDescription)")
}
})
} catch {
print("Failed to start workout session: \(error.localizedDescription)")
}
}
func workoutBuilder(_ workoutBuilder: HKLiveWorkoutBuilder, didCollectDataOf collectedTypes: Set<HKSampleType>) {
print("collected types: \(collectedTypes)")
for type in collectedTypes {
if let quantityType = type as? HKQuantityType {
if quantityType == HKQuantityType.quantityType(forIdentifier: .heartRate) {
if let heartRateQuantity = workoutBuilder.statistics(for: quantityType)?.mostRecentQuantity() {
let heartRateUnit = HKUnit(from: "count/min")
let heartRateValue = heartRateQuantity.doubleValue(for: heartRateUnit)
print("heart rate: \(heartRateValue)")
}
}
if quantityType == HKQuantityType.quantityType(forIdentifier: .heartRateVariabilitySDNN) {
if let hrvQuantity = workoutBuilder.statistics(for: quantityType)?.mostRecentQuantity() {
let hrvUnit = HKUnit.secondUnit(with: .milli)
let hrvValue = hrvQuantity.doubleValue(for: hrvUnit)
print("HRV: \(hrvValue)")
}
}
if quantityType == HKQuantityType.quantityType(forIdentifier: .bodyTemperature) {
if let bodyTempQuantity = workoutBuilder.statistics(for: quantityType)?.mostRecentQuantity() {
let tempUnit = HKUnit.degreeCelsius()
let tempValue = bodyTempQuantity.doubleValue(for: tempUnit)
print("body temp: \(tempValue)")
}
}
if quantityType == HKQuantityType.quantityType(forIdentifier: .respiratoryRate) {
if let respRateQuantity = workoutBuilder.statistics(for: quantityType)?.mostRecentQuantity() {
let respRateUnit = HKUnit(from: "count/min")
let respRateValue = respRateQuantity.doubleValue(for: respRateUnit)
print("breathing: \(respRateValue)")
}
}
}
}
}
}
Topic:
App & System Services
SubTopic:
Health & Fitness
Tags:
watchOS
Health and Fitness
HealthKit
Apple Watch