如何获取最近7天的健康数据

Question

我正在尝试获取最近7天内的步骤，但是找不到如何执行的步骤。 我想要接收的是一个由7个元素组成的数组，其中每个元素都是Day，每个元素各自的总步数 。 我目前有这段代码，该代码获得了今天的步骤：

//Gets the steps
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, error) in
        guard let result = result, let sum = result.sumQuantity() else {
            print("Failed to fetch steps = \(error?.localizedDescription ?? "N/A")")
            completion(0.0)
            return
        }

        DispatchQueue.main.async {
            completion(sum.doubleValue(for: HKUnit.count()))
        }
    }
    healthKitStore.execute(query)
}

我这样调用该函数：

getTodaysSteps { (steps) in
        self.stepsNumber = Int(steps)
    }

Answer 1

尝试使用HKStatisticsCollectionQuery ，它将为您执行日期数学运算并自动存储结果。 这是一个示例，该示例应提供最近7天的步数：

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

    let now = Date()
    let exactlySevenDaysAgo = Calendar.current.date(byAdding: DateComponents(day: -7), to: now)!
    let startOfSevenDaysAgo = Calendar.current.startOfDay(for: exactlySevenDaysAgo)
    let predicate = HKQuery.predicateForSamples(withStart: startOfSevenDaysAgo, end: now, options: .strictStartDate)

    let query = HKStatisticsCollectionQuery.init(quantityType: stepsQuantityType,
                                                 quantitySamplePredicate: predicate,
                                                 options: .cumulativeSum,
                                                 anchorDate: startOfSevenDaysAgo,
                                                 intervalComponents: DateComponents(day: 1))

    query.initialResultsHandler = { query, results, error in
        guard let statsCollection = results else {
            // Perform proper error handling here...
        }

        statsCollection.enumerateStatistics(from: startOfSevenDaysAgo, to: now) { statistics, stop in

            if let quantity = statistics.sumQuantity() {
                let stepValue = quantity.doubleValueForUnit(HKUnit.countUnit())
                // ...
            }
        }
    }

Answer 2

这里有更简单的解决方案。

func getTotalSteps(forPast days: Int, completion: @escaping (Double) -> Void) {
    // Getting quantityType as stepCount
    guard let stepsQuantityType = HKObjectType.quantityType(forIdentifier: .stepCount) else {
        print("*** Unable to create a step count type ***")
        return
    }

    let now = Date()
    let startDate = Calendar.current.date(byAdding: DateComponents(day: -days), to: now)
    let predicate = HKQuery.predicateForSamples(withStart: startDate, 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()))
    }
    execute(query)
}

现在调用只需使用以下代码：

HKHealthStore().getTotalSteps(forPast: 30) { totalSteps in
    print(totalSteps)
}

Answer 3

您唯一需要实现的更改是将作为startWith参数提供的Date对象更改为HKStatisticsQuery 。 您可以通过使用Calendar.date(byAdding:,to:)首先恰好回到7天的时间，然后在该对象上调用startOfDay(for:) Calendar.date(byAdding:,to:)创建一个表示7天前一天开始Date对象。

let now = Date()
let exactlySevenDaysAgo = Calendar.current.date(byAdding: DateComponents(day: -7), to: now)!
let startOfSevenDaysAgo = Calendar.current.startOfDay(for: exactlySevenDaysAgo)
let predicate = HKQuery.predicateForSamples(withStart: startOfSevenDaysAgo, end: now, options: .strictStartDate)