swift - 如何按日期明智地获取Apple健康数据？

苹果健康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
作为

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。
进一步我正在使用HKSampleQuery的for循环，它给出了HKQuantitySample对象。
问题是[HKQuantitySample]提供了未按日期排序的步骤数据数组。
我正在寻找日期适合的数据，例如“健康”应用程序中显示的苹果健康状况。

是的，有一些解决方法，例如按日期明智地手动排序[HKQuantitySample]中的数据。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任何其他信息。

编辑:如@Allan 所建议
我已经添加了HKStatisticsCollectionQuery，是的，它按日期提供数据数据，但是接收的步骤数与Apple health App中的不同。以下代码中需要添加/修改吗？

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)

最佳答案

使用HKStatisticsCollectionQuery从特定时间段获取数据。以下示例显示了如何获取最近30天的步骤:

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)
}

关于swift - 如何按日期明智地获取Apple健康数据？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50620547/