ios HealthKit Swift 迈出了今天的步伐

HealthKit Swift getting today's steps

提问by owlswipe

I am making a swift iOS app that integrates with a user's step count as reported by the Health app. I can easily find the user's step count in the last hour, using this as my predicate:

我正在制作一个快速的 iOS 应用程序，它与 Health 应用程序报告的用户步数集成。我可以很容易地找到用户在过去一小时内的步数，使用它作为我的谓词：

let anHourBeforeNow: NSDate = NSDate().dateByAddingTimeInterval(-60 * 60)
let predicate = HKQuery.predicateForSamplesWithStartDate(anHourBeforeNow, endDate: NSDate(), options: .None)

And I have the rest down, so I can successfully access the user's step count for the last hour. But how can I access the user's step data since the day began, like the Health app displays in the steps section?

我已经完成了其余的工作，因此我可以成功访问用户过去一小时的步数。但是如何访问用户自一天开始以来的步数数据，就像步数部分中显示的健康应用程序一样？

I am trying to do something like this:

我正在尝试做这样的事情：

let date = NSDate()
let cal = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
let newDate = cal.startOfDayForDate(date)
let predicate = HKQuery.predicateForSamplesWithStartDate(newDate, endDate: NSDate(), options: .None)

but this code does not adjust for time zone (so it gives me the beginning of the day in UTC, not the beginning of the day where the user is) and I am also getting highly inflated step counts (for reasons unknown).

但是此代码不会针对时区进行调整（因此它为我提供了 UTC 中一天的开始，而不是用户所在的一天的开始），而且我的步数计数也非常高（原因未知）。

So how can I get the user's step count for the current day, with the same number of steps as reported in Health, like pictured here:

那么如何获取用户当天的步数，其步数与 Health 中报告的步数相同，如下图所示：

回答by José

HKStatisticsCollectionQuery is better suited to use when you want to retrieve data over a time span. Use HKStatisticsQuery to just get the steps for a specific date.

HKStatisticsCollectionQuery 更适合在您想要检索一段时间内的数据时使用。使用 HKStatisticsQuery 来获取特定日期的步骤。

Swift 5:

斯威夫特 5：

    let healthStore = HKHealthStore()

    func getTodaysSteps(completion: @escaping (Double) -> Void) {
        let stepsQuantityType = HKQuantityType.quantityType(forIdentifier: .stepCount)!

        let now = Date()
        let startOfDay = Calendar.current.startOfDay(for: now)
        let predicate = HKQuery.predicateForSamples(withStart: startOfDay, end: now, options: .strictStartDate)

        let query = HKStatisticsQuery(quantityType: stepsQuantityType, quantitySamplePredicate: predicate, options: .cumulativeSum) { _, result, _ in
            guard let result = result, let sum = result.sumQuantity() else {
                completion(0.0)
                return
            }
            completion(sum.doubleValue(for: HKUnit.count()))
        }

        healthStore.execute(query)
    }

回答by Gugulethu

Here is the right way using HKStatisticsCollectionQuery courtesy of the direction from the code above.

这是根据上面代码的方向使用 HKStatisticsCollectionQuery 的正确方法。

This is written in Swift 3 so you may have to convert some of the code back to 2.3 or 2 if not on 3 yet.

这是用 Swift 3 编写的，因此您可能需要将某些代码转换回 2.3 或 2，如果还不是 3。

Swift 3

斯威夫特 3

 func retrieveStepCount(completion: (stepRetrieved: Double) -> Void) {

        //   Define the Step Quantity Type
        let stepsCount = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)

        //   Get the start of the day         
        let date = Date()
        let cal = Calendar(identifier: Calendar.Identifier.gregorian)
        let newDate = cal.startOfDay(for: date)

        //  Set the Predicates & Interval
        let predicate = HKQuery.predicateForSamples(withStart: newDate, end: Date(), options: .strictStartDate)
        var interval = DateComponents()
        interval.day = 1

        //  Perform the Query
        let query = HKStatisticsCollectionQuery(quantityType: stepsCount!, quantitySamplePredicate: predicate, options: [.cumulativeSum], anchorDate: newDate as Date, intervalComponents:interval)

        query.initialResultsHandler = { query, results, error in

            if error != nil {

                //  Something went Wrong
                return
            }

            if let myResults = results{
                myResults.enumerateStatistics(from: self.yesterday, to: self.today) {
                    statistics, stop in

                    if let quantity = statistics.sumQuantity() {

                        let steps = quantity.doubleValue(for: HKUnit.count())

                        print("Steps = \(steps)")
                        completion(stepRetrieved: steps)

                    }
                }
            }


        }

        storage.execute(query)
    }

Objective-C

目标-C

HKQuantityType *type = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];

NSDate *today = [NSDate date];
NSDate *startOfDay = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] startOfDayForDate:today];

NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:startOfDay endDate:today options:HKQueryOptionStrictStartDate];
NSDateComponents *interval = [[NSDateComponents alloc] init];
interval.day = 1;

HKStatisticsCollectionQuery *query = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:type quantitySamplePredicate:predicate options:HKStatisticsOptionCumulativeSum anchorDate:startOfDay intervalComponents:interval];

query.initialResultsHandler = ^(HKStatisticsCollectionQuery * _Nonnull query, HKStatisticsCollection * _Nullable result, NSError * _Nullable error) {
  if (error != nil) {
    // TODO
  } else {
    [result enumerateStatisticsFromDate:startOfDay toDate:today withBlock:^(HKStatistics * _Nonnull result, BOOL * _Nonnull stop) {
      HKQuantity *quantity = [result sumQuantity];
      double steps = [quantity doubleValueForUnit:[HKUnit countUnit]];
      NSLog(@"Steps : %f", steps);
    }];
  }
};

[self.storage executeQuery:query];

回答by John Ramos

The query you were using takes all of the user's recorded steps from Healthkit, not doing the smart filter-out of duplicative steps the Health app does. Instead, you want to get the aggregated step data that the Health app produces after combining steps from different sources to get an accurate tally.

您使用的查询从 Healthkit 获取用户记录的所有步骤，而不是对 Health 应用程序执行的重复步骤进行智能过滤。相反，您希望获得 Health 应用程序在组合来自不同来源的步骤以获得准确计数后生成的聚合步骤数据。

To do that, you can use this code:

为此，您可以使用以下代码：

func recentSteps2(completion: (Double, NSError?) -> () )
{ // this function gives you all of the steps the user has taken since the beginning of the current day.

    checkAuthorization() // checkAuthorization just makes sure user is allowing us to access their health data.
    let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount) // The type of data we are requesting


    let date = NSDate()
    let cal = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
    let newDate = cal.startOfDayForDate(date)
    let predicate = HKQuery.predicateForSamplesWithStartDate(newDate, endDate: NSDate(), options: .None) // Our search predicate which will fetch all steps taken today

    // The actual HealthKit Query which will fetch all of the steps and add them up for us.
    let query = HKSampleQuery(sampleType: type!, predicate: predicate, limit: 0, sortDescriptors: nil) { query, results, error in
        var steps: Double = 0

        if results?.count > 0
        {
            for result in results as! [HKQuantitySample]
            {
                steps += result.quantity.doubleValueForUnit(HKUnit.countUnit())
            }
        }

        completion(steps, error)
    }

    storage.executeQuery(query)
}

回答by Hardik Thakkar

For swift 4.2

对于快速 4.2

1) Get HealthKitPermission

1) 获取 HealthKit 权限

import HealthKit

func getHealthKitPermission() {

    delay(0.1) {
        guard HKHealthStore.isHealthDataAvailable() else {
            return
        }

        let stepsCount = HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!

        self.healthkitStore.requestAuthorization(toShare: [], read: [stepsCount]) { (success, error) in
            if success {
                print("Permission accept.")
            }
            else {
                if error != nil {
                    print(error ?? "")
                }
                print("Permission denied.")
            }
        }
    }
}

2) To get steps count for specific date

2）获取特定日期的步数

func getStepsCount(forSpecificDate:Date, completion: @escaping (Double) -> Void) {
        let stepsQuantityType = HKQuantityType.quantityType(forIdentifier: .stepCount)!
        let (start, end) = self.getWholeDate(date: forSpecificDate)

        let predicate = HKQuery.predicateForSamples(withStart: start, end: end, options: .strictStartDate)

        let query = HKStatisticsQuery(quantityType: stepsQuantityType, quantitySamplePredicate: predicate, options: .cumulativeSum) { _, result, _ in
            guard let result = result, let sum = result.sumQuantity() else {
                completion(0.0)
                return
            }
            completion(sum.doubleValue(for: HKUnit.count()))
        }

        self.healthKitStore.execute(query)
    }

    func getWholeDate(date : Date) -> (startDate:Date, endDate: Date) {
        var startDate = date
        var length = TimeInterval()
        _ = Calendar.current.dateInterval(of: .day, start: &startDate, interval: &length, for: startDate)
        let endDate:Date = startDate.addingTimeInterval(length)
        return (startDate,endDate)
    }

How to use

如何使用

self.getStepsCount(forSpecificDate: Date()) { (steps) in
                if steps == 0.0 {
                    print("steps :: \(steps)")
                }
                else {
                    DispatchQueue.main.async {
                        print("steps :: \(steps)")
                    }
                }
            }

回答by onmyway133

If you want to get the total number of step for each day, over a period of time, then use HKStatisticsCollectionQuery, code in Swift 4.2

如果您想获得一段时间内每天的总步数，请使用HKStatisticsCollectionQuery，Swift 4.2 中的代码

let startDate = Date().addingTimeInterval(-3600 * 24 * 7)
let endDate = Date()

let predicate = HKQuery.predicateForSamples(
  withStart: startDate,
  end: endDate,
  options: [.strictStartDate, .strictEndDate]
)

// interval is 1 day
var interval = DateComponents()
interval.day = 1

// start from midnight
let calendar = Calendar.current
let anchorDate = calendar.date(bySettingHour: 12, minute: 0, second: 0, of: Date())

let query = HKStatisticsCollectionQuery(
  quantityType: HKSampleType.quantityType(forIdentifier: .stepCount)!,
  quantitySamplePredicate: predicate,
  options: .cumulativeSum,
  anchorDate: anchorDate!,
  intervalComponents: interval
)

query.initialResultsHandler = { query, results, error in
  guard let results = results else {
    return
  }

  results.enumerateStatistics(
    from: startDate,
    to: endDate,
    with: { (result, stop) in
      let totalStepForADay = result.sumQuantity()?.doubleValue(for: HKUnit.count()) ?? 0
    }
  )
}

store.execute(query)

回答by richc

Using the above answers and from Apple here: https://developer.apple.com/reference/healthkit/hkstatisticsqueryI got the following to work in swift 2.3 on Xcode 8.0.

使用上面的答案和来自 Apple 的答案：https: //developer.apple.com/reference/healthkit/hkstatisticsquery我得到了以下内容，可以在 Xcode 8.0 上的 swift 2.3 中工作。

class func getStepCountHealth(startDate: NSDate, endDate: NSDate, completion:(Double?, NSError?)->()) {

            let healthKitStore:HKHealthStore = HKHealthStore()

            //   Define the sample type
            let sampleType = HKQuantityType.quantityTypeForIdentifier(
            HKQuantityTypeIdentifierStepCount)

            //  Set the predicate
            let predicate = HKQuery.predicateForSamplesWithStartDate(startDate,
                                                                 endDate: endDate, options: .None)
            // build the query
            let sampleQuery = HKStatisticsQuery(quantityType: sampleType!,
                                      quantitySamplePredicate: predicate,
                                      options: .CumulativeSum) { query, results, error in

                                        if results != nil {
                                            let quantity = results?.sumQuantity()
                                            let unit = HKUnit.countUnit()
                                            let totalSteps = quantity?.doubleValueForUnit(unit)
                                            completion(totalSteps, error)
//                                            print("totalSteps for \(endDate) are \(totalSteps!)")
                                        } else {
                                            completion(nil, error)
//                                            print("results are nil")
                                            return
                                        } 
                                    }
            // execute the Query
            healthKitStore.executeQuery(sampleQuery)
        }