如何按日期明智地获取Apple健康数据?

问题描述

Apple health应用程序按日期明智地提供数据，如下图所示.

通过使用HealthKit，我正在从Apple Health中获取步骤数据

By using HealthKit i am fetching the steps data from apple healthas

let p1 = HKQuery.predicateForSamples(withStart: fromDate, end: Date(), options: .strictStartDate)
let p2 = HKQuery.predicateForObjects(withMetadataKey: HKMetadataKeyWasUserEntered, operatorType: .notEqualTo, value: true)
let timeSortDesriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)//as in health kit entry
let quantityType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
let predicate = HKQuery.predicateForSamples(withStart: fromDate, end: Date(), options: .strictStartDate)
let sourceQuery = HKSourceQuery(sampleType: quantityType, samplePredicate: predicate, completionHandler: { query,sources,error in

if sources?.count != 0  && sources != nil {

                let lastIndex = sources!.count - 1
                var sourcesArray = Array(sources!)
                for i in 0..<sourcesArray.count {
                    let sourcePredicate = HKQuery.predicateForObjects(from: sourcesArray[i])
                    let predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [p1, p2,sourcePredicate])
                    let query = HKSampleQuery(sampleType: quantityType, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: [timeSortDesriptor], resultsHandler: { query, results, error in
                        guard let samples = results as? [HKQuantitySample] else {
                            return
                        }......

sourceQuery提供了多个对象，例如Apple Watch，My iPhone.此外，我正在使用HKSampleQuery的for循环，该循环给出了HKQuantitySample对象.问题是[HKQuantitySample]给出未按日期排序的步骤数据数组.我正在寻找像健康"应用程序中的苹果健康显示日期那样的日期数据.

sourceQuery gives multiple object like Apple watch, My iPhone.further i am using for loop with HKSampleQuery which gives HKQuantitySample object.Problem is [HKQuantitySample] gives Array of step data which is not sorted datewise.I am looking for data which are club for the date like what apple health show in Health app.

是的，有一些解决方法，例如按日期对[HKQuantitySample]中的数据进行手动排序.但是使用predicates或其他方法可能可以解决.请随时询问您是否需要其他信息.

Yes there is workaround like manually sort the data from [HKQuantitySample] by date wise. but there may be workaround by using predicates or something else. Please feel free to ask if you need any extra information.

如@Allan所建议我添加了 HKStatisticsCollectionQuery ，是的，它按日期按日期提供数据，但是步骤计数接收与Apple health App中的计数不同.下面的代码中需要添加/修改吗?

As suggested by @AllanI have added HKStatisticsCollectionQuery, YES it gives data datewise but the steps count receiving is not same as in Apple health App. is something Addition/modification required in below code ?

let last10Day = Calendar.current.date(byAdding: .day, value: -10, to: Date())!
        var interval = DateComponents()
        interval.day = 1
        let quantityType1 = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
        // Create the query
        let query = HKStatisticsCollectionQuery(quantityType: quantityType1,
                                                quantitySamplePredicate: nil,
                                                options: .cumulativeSum,
                                                anchorDate: last10Day,
                                                intervalComponents: interval)
        // Set the results handler
        query.initialResultsHandler = {
            query, results, error in

            guard let statsCollection = results else {
                // Perform proper error handling here
                fatalError("*** An error occurred while calculating the statistics: \(String(describing: error?.localizedDescription)) ***")
            }
            let endDate = Date()
            statsCollection.enumerateStatistics(from: last10Day, to: endDate, with: { (statistics, stop) in
                if let quantity = statistics.sumQuantity() {
                    let date = statistics.startDate
                    let value = quantity.doubleValue(for: HKUnit.count())
                    print("--value-->",value, ",--For Date-->",date)
                }
            })
        }
            healthStore.execute(query)

推荐答案

使用HKStatisticsCollectionQuery提取特定时间段内的数据.这是一个示例，显示了如何获取最近30天的步骤:

Use HKStatisticsCollectionQuery to fetch data from a certain period. Here is an example showing how to fetch steps for the last 30 days:

private let healthStore = HKHealthStore()
private let stepsQuantityType = HKQuantityType.quantityType(forIdentifier: .stepCount)!

func importStepsHistory() {
    let now = Date()
    let startDate = Calendar.current.date(byAdding: .day, value: -30, to: now)!

    var interval = DateComponents()
    interval.day = 1

    var anchorComponents = Calendar.current.dateComponents([.day, .month, .year], from: now)
    anchorComponents.hour = 0
    let anchorDate = Calendar.current.date(from: anchorComponents)!

    let query = HKStatisticsCollectionQuery(quantityType: stepsQuantityType,
                                        quantitySamplePredicate: nil,
                                        options: [.cumulativeSum],
                                        anchorDate: anchorDate,
                                        intervalComponents: interval)
    query.initialResultsHandler = { _, results, error in
        guard let results = results else {
            log.error("Error returned form resultHandler = \(String(describing: error?.localizedDescription))")
            return
    }

        results.enumerateStatistics(from: startDate, to: now) { statistics, _ in
            if let sum = statistics.sumQuantity() {
                let steps = sum.doubleValue(for: HKUnit.count())
                print("Amount of steps: \(steps), date: \(statistics.startDate)")
            }
        }
    }

    healthStore.execute(query)
}

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