CODEWITHSUNDEEP
swifthealthkit
KeykoYume
KeykoYume

Reputation: 2645

HKQuantity to Double - getting Active Energy Value from Healthkit

I'm working on a method that reads the active energy (kcal) from health kit but I have a problem getting the double value from the HKQuantity. My code looks like this: 

func getActiveEnergy () {
    let endDate = NSDate()
    let startDate = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: -1, toDate: endDate, options: [])

    let energySampleType = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierActiveEnergyBurned)
    let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: endDate, options: .None)

    print ("start date: ", startDate)
    print ("end date: ", endDate)

    let query = HKSampleQuery(sampleType: energySampleType!, predicate: predicate, limit: 0, sortDescriptors: nil, resultsHandler: {
        (query, results, error) in
        if results == nil {
            print("There was an error running the query: \(error)")
        }

        dispatch_async(dispatch_get_main_queue()) {

            for activity in results as! [HKQuantitySample]
            {
                self.todayActiveEnergy = activity.quantity.doubleValueForUnit(HKUnit.countUnit())
                print(">>>>>", self.todayActiveEnergy)
            }

        }
    })
    self.healthKitStore.executeQuery(query)
}

My problem is with this row:

 self.todayActiveEnergy = activity.quantity.doubleValueForUnit(HKUnit.countUnit())

The activity.quantity returns indeed the right value (156 kcal) but when i try getting the double value from it (as done above) I get libc++abi.dylib: terminating with uncaught exception of type NSException

Any idea why this might happen?

Upvotes: 3

Views: 3075

Answers (1)

KeykoYume
KeykoYume

Reputation: 2645

Thanks to OOPer for his comment. Changing the line to:

self.todayActiveEnergy = activity.quantity.doubleValueForUnit(HKUnit.kilocalorieUnit())

did the trick.

Upvotes: 7

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