CODEWITHSUNDEEP
iosiphoneswifthealthkithksamplequery
Egghead
Egghead

Reputation: 7017

How can I get daily average steps form HealthKit

I'm trying to display the daily amount of steps the user takes. But I don't really know how to manage this.

I already got this code:

let endDate = NSDate()
let startDate = NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitMonth, value: -1, toDate: endDate, options: nil)
    
let weightSampleType = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: endDate, options: .None)
    
let query = HKSampleQuery(sampleType: weightSampleType, predicate: predicate, limit: 0, sortDescriptors: nil, resultsHandler: {
        (query, results, error) in
        if results == nil {
            println("There was an error running the query: \(error)")
        }
        
        dispatch_async(dispatch_get_main_queue()) {
            var dailyAVG = Int()
            var steps = results as [HKQuantitySample]
            for var i = 0; i < results.count; i++
            {
                //results[i] add values to dailyAVG
            }
        }
    })
    
 self.healthKitStore.executeQuery(query)

The query gets all the data needed as far as I know. But I don't know how to get the values out of the HKQuantitySample. So I cant test if the correct values are in the HKQuantitySample Array.

Upvotes: 5

Views: 5567

Answers (2)

Steven Bishop
Steven Bishop

Reputation: 101

In case anyone else is trying to solve this in a not-so-terrible way...

At this time, it doesn't look like using HKStatisticsQuery or HKStatisticsCollectionQuery is possible for getting average step count. You can only use HKStatisticsOptionDiscreteAverage on a discrete data type. If you look at the header for HKTypeIdentifiers, you will see that HKQuantityTypeIdentifierStepCount is a cumulative data type.

If you try and fetch the average step count, Xcode spits out: Statistics option HKStatisticsOptionDiscreteAverage is not compatible with cumulative data type HKQuantityTypeIdentifierStepCount.

Best Solution

Get the total number of steps a user has taken. You can specify a time period between two dates. Divide the total number of steps by however many days are between your two dates.

Upvotes: 10

Lyndsey Scott
Lyndsey Scott

Reputation: 37290

You need to loop through steps not results and then use each HKQuantitySample result's quantity property to get the number of steps in that sample, ex:

var dailyAVG:Double = 0
for steps in results as [HKQuantitySample]
{
   // add values to dailyAVG
   dailyAVG += steps.quantity.doubleValueForUnit(HKUnit.countUnit())
}

Upvotes: 2

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