hkLiveWorkoutBuilder.statistics(for: heartRate) vs HKAnchoredObjectQuery when developing workout app
I'm making a workout app for Apple Watch.
I start HKWorkoutSession, then associate it with HKLiveWorkoutBuilder and begin listening for heart rate and calorie changes.
I have 2 options on how to get a heart rate or calories:
Using HKLiveWorkoutBuilder statistics:
let heartRate = HKQuantityType.quantityType(forIdentifier: .heartRate),
let statistics = builder.statistics(for: heartRate){
let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
let value = statistics.mostRecentQuantity()?.doubleValue(for: heartRateUnit)
2. Executing HKAnchoredObjectQuery:
let heartRateSample = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.heartRate)
let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
let updateHandler: (HKAnchoredObjectQuery, [HKSample]?, [HKDeletedObject]?, HKQueryAnchor?, Error?) - () = {
query, newResult, deleted, newAnchor, error in
if let samples = newResult as? [HKQuantitySample] {
guard samples.count 0 else {
return
}
for sample in samples {
let value = sample.quantity.doubleValue(for: heartRateUnit)
value = Int(value)
}
}
}
heartRateQuery = HKAnchoredObjectQuery(type: heartRateSample!,
predicate: nil,
anchor: nil,
limit: Int(HKObjectQueryNoLimit),
resultsHandler: updateHandler)
heartRateQuery!.updateHandler = updateHandler
store?.execute(heartRateQuery!)
Which of the options is preferable?
Are there any benefits of using one over another?
Big thanks for all your responses!
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