Get total step count for every date in HealthKit

Question

What\'s the best way to get a total step count for every day recorded in HealthKit. With HKSampleQuery\'s method initWithSampleType (see below) I can set a star

Answer 1

Here is a translation that currently works for Swift 2.0, using the SwiftDate library.

    let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
    let startDate = NSDate().beginningOfDay().oneWeekAgo()
    let interval = NSDateComponents()
    interval.day = 1

    let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: NSDate(), options: .StrictStartDate)
    let query = HKStatisticsCollectionQuery(quantityType: type!, quantitySamplePredicate: predicate, options: [.CumulativeSum], anchorDate: NSDate().begginingOfDay(), intervalComponents:interval)

    query.initialResultsHandler = { query, results, error in


        let endDate = NSDate()
        let startDate = NSDate().beginningOfDay().oneWeekAgo()
        if let myResults = results{
            myResults.enumerateStatisticsFromDate(startDate, toDate: endDate) {
                statistics, stop in

                if let quantity = statistics.sumQuantity() {

                    let date = statistics.startDate
                    let steps = quantity.doubleValueForUnit(HKUnit.countUnit())
                    print("\(date): steps = \(steps)")
                }
            }
        }
    }

    healthKitStore.executeQuery(query)