hkLiveWorkoutBuilder.statistics(for: heartRate) vs HKAnchoredObjectQuery when developing workout app

Question

Created May ’21

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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:

Code Block  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:

Code Block 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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Answer 1

chuanpham OP

Feb ’24

Hi @nastya_kh, did you get the answer? Which one is better? Thank you!

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