如何使用 Swift 从 iOS HealthKit 中逐分钟读取数据

Question

我每小时、每天、每周等都正确地从 HealthKit 读取步数数据。但是当将查询时间间隔减少到 15 分钟以下时，HealthKit 返回错误的步数数据。我需要一分钟一分钟地读取数据。是否可以？

这是我的代码。 HealthKit 使用下面的代码返回数据，但它显示的步数数据超过 10%。

    func getMinutelyStepData(startingDate: Date) {

    print("Setting hourly step data for \(startingDate)")
    var loopCount = 0
    var totalStep = 0.0
    let endOfDay = startingDate.endOfDay//Calendar.current.date(byAdding: .hour, value: 23, to: startingDate)!
    let stepType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!

    let minutely = DateComponents(minute: 1)

    var queryStepMinutely: HKStatisticsCollectionQuery?
    let predicate = HKQuery.predicateForSamples(withStart: startingDate, end: endOfDay, options: .strictStartDate)
    let myAnchorDate = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: Date())!
    
    queryStepMinutely = HKStatisticsCollectionQuery(quantityType: stepType, quantitySamplePredicate: predicate, options: .cumulativeSum, anchorDate: myAnchorDate, intervalComponents: minutely)
    
    queryStepMinutely!.initialResultsHandler = { query, statisticsCollection, error in
        
        if let result = statisticsCollection {
            result.enumerateStatistics(from: startingDate, to: endOfDay) { (statistics, stop) in

                if let step = statistics.sumQuantity() {
                    let value = step.doubleValue(for: .count())
                    totalStep += value
                    print("Minutely step data: \(value), \(statistics.startDate), my total step: \(totalStep)")
                } else {
                    print("No step data for minutely available, so add 0..., \(statistics.startDate), \(statistics.endDate)")
                }
            }

        }
        
    }
    myHealthStore.execute(queryStepMinutely!)
}