How can I add the calories calculated from custom formula in a workout in HealthApp from Apple Watch.

Question

Created Aug ’20

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I am creating a workout session in Apple Watch. I am tracking the distance and the heart rate through the workout session. The HKLiveWorkoutBuilder is already set. The data collects correctly. But I calculate calories from my own equation. But when I finish the workout, the calories are not saved correctly. For eg. if I have calories from my formula equals to 20kCal, in HealthApp, it Shows a different number.

Code Block func endWorkout(caloriesCalc: Double, completion: @escaping (_ success: Bool, _ error: String?) -> Void) {
        session.end()
        if let quantityType = HKQuantityType.quantityType(forIdentifier: .activeEnergyBurned) {
            let unit = HKUnit.largeCalorie()//HKUnit.kilocalorie()
            let caloriesBurned = caloriesCalc
            let quantity = HKQuantity(unit: unit, doubleValue: caloriesBurned)
            
            let sample = HKQuantitySample(type: quantityType, quantity: quantity, start: self.workoutStartTime, end: Date())//HKCumulativeQuantitySample(type: quantityType, quantity: quantity, start: self.workoutStartTime, end: Date(), metadata: nil)
            builder.add([sample]) { (success, error) in
                guard success else {
                    print("error ======> \(error)")
                    return
                }
                self.builder.endCollection(withEnd: Date()) { (success, error) in
                    guard success else {
                        completion(success, "Something went wrong! Please try again.")
                        return
                    }
                    self.activeSession = nil
                    self.builder.finishWorkout { (workout, error) in
                        if let error = error {
                            completion(false, "Something went wrong! Please try again.")
                            return
                        }
                        self.activityType = nil
                        completion(true, nil)
                    }
                }
            }
        }
    }

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Answer 1

Frameworks Engineer OP

Apple

Aug ’20

What number are you getting? Note that the final computation of active energy (and other types) for the HKWorkout sample takes into account the actual workout duration, including pauses; since you're creating a single large active energy sample spanning a duration from the beginning of the workout until the call to endWorkout it's possible that you're creating a sample that doesn't properly account for workout start/end time or pause/resume periods.

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