Hi everyone!
I have created an app to save & read some running & walking workout data to HealthKit. I managed to save the data, and view it on the simulator's Health app, but when I try to read the data, sample count is 0. I'd appreciate if someone help me out with this.
Thanks in advance!
Xcode 12.5.1 / iOS 14.5
func AuthenticateHealthKit() {
print("AuthenticateHealthKit")
let typesToShare: Set = [
HKQuantityType.workoutType()
]
let typesToRead: Set = [
HKQuantityType.workoutType(),
HKQuantityType.quantityType(forIdentifier: .distanceWalkingRunning)!,
HKQuantityType.quantityType(forIdentifier: .height)!,
]
healthStore.requestAuthorization(toShare: typesToShare, read: typesToRead) { (success, error) in
if !success {
fatalError("Error requesting authorization from health store: \(String(describing: error)))")
} else {
print("Authenticated!")
}
}
}
func SaveData() {
let configuration = HKWorkoutConfiguration()
configuration.activityType = .running
configuration.locationType = Int.random(in: 0..<2) == 0 ? .indoor : .outdoor
let startDate = now - (86400 * 60.0)
let duration = 120.0
let endDate = startDate + duration
let quantity = HKQuantity(unit: HKUnit.kilocalorie(), doubleValue: 20.0)
let distance = HKQuantity(unit: HKUnit.meter(), doubleValue: 1200)
let workout = HKWorkout(
activityType: configuration.activityType, start: startDate, end: endDate, duration: duration,
totalEnergyBurned: quantity, totalDistance: distance,
metadata: [HKMetadataKeyIndoorWorkout: true])
healthStore.save(workout) { success, _ in
if success {
print("SAVED WORKOUT!!!")
} else {
print("COULD NOT SAVE WORKOUT!!!")
}
}
}
func ReadData() {
let start = now - (86400 * 60.0)
let end = now
let predicate = HKQuery.predicateForSamples(withStart: start, end: end, options: [])
print("start : \(start)")
guard HKHealthStore.isHealthDataAvailable() else {
print("No data available!")
return
}
guard
let sampleType = HKSampleType.quantityType(
forIdentifier: HKQuantityTypeIdentifier.distanceWalkingRunning)
else {
fatalError("*** This method should never fail ***")
}
let query = HKSampleQuery(
sampleType: sampleType, predicate: predicate, limit: Int(HKObjectQueryNoLimit),
sortDescriptors: nil
) {
query, results, error in
guard let samples = results as? [HKQuantitySample] else {
print("Error")
return
}
for sample in samples {
print("sample : \(sample.quantity) \(sample.quantityType)")
}
DispatchQueue.main.async {
print("Update UI : \(samples.count)")
}
}
healthStore.execute(query)
}
Output of ReadData method
start : 2021-08-14 21:38:35 +0000
Authenticated!
Update UI : 0
Following are the Health App data & permissions (all on simulator)
You're writing workouts but wanting to read distance walking+running. Saving a distance property on workouts does not save a distance walking+running sample. You need to create a sample of that type, request auth for it, and save and associate with a workout using addSamples method on HKHealthStore
.
It's much better to use an HKWorkoutBuilder and it's beginCollection/add/endCollection/finishWorkout methods which will create a proper HKWorkout
object for you.