Question

我正在使用苹果的HealthKit sample但iPhone中健康应用中显示的静止能量值与示例应用中提取的值不匹配。

根据苹果文档， HKQuantityTypeIdentifierBasalEnergyBurned 表示静止能量所以我从HealthKit中获取此值，但我收到的值与静止不匹配能源显示在健康应用中。

所以我遇到了苹果的HealthKit sample，他们根据公式计算静息能量：

// Calculates the user's total basal (resting) energy burn based off of their height, weight, age,
    // and biological sex. If there is not enough information, return an error.
    private func fetchTotalBasalBurn(completion: @escaping (HKQuantity?, Error?) -> Void)
    {
        let todayPredicate: NSPredicate = self.predicateForSamplesToday()

        let weightType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.bodyMass)!
        let heightType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.height)!

        let queryWeigth: HKCompletionHandle = {
            (weight, error) -> Void in

            guard let weight = weight else {
                completion(nil, error)

                return
            }

            let queryHeigth: HKCompletionHandle = {
                (height, error) -> Void in

                if height == nil {
                    completion(nil, error)

                    return;
                }

                var dateOfBirth: Date!

                do {

                    dateOfBirth = try self.healthStore!.dateOfBirth()

                } catch {

                    completion(nil, error)

                    return
                }

                var biologicalSexObjet: HKBiologicalSexObject!

                do {

                    biologicalSexObjet = try self.healthStore!.biologicalSex()

                } catch {

                    completion(nil, error)

                    return
                }

                // Once we have pulled all of the information without errors, calculate the user's total basal energy burn
                let basalEnergyButn: HKQuantity? = self.calculateBasalBurnTodayFromWeight(weight, height: height, dateOfBirth: dateOfBirth!, biologicalSex: biologicalSexObjet)

                completion(basalEnergyButn, nil)
            }

            if let healthStore = self.healthStore {

                healthStore.mostRecentQuantitySample(ofType: heightType, predicate: todayPredicate, completion: queryHeigth)
            }
        }

        if let healthStore = self.healthStore {
            healthStore.mostRecentQuantitySample(ofType: weightType, predicate: nil, completion: queryWeigth)
        }
    }

    private func calculateBasalBurnTodayFromWeight(_ weight: HKQuantity?, height: HKQuantity?, dateOfBirth: Date, biologicalSex: HKBiologicalSexObject) -> HKQuantity?
    {
        // Only calculate Basal Metabolic Rate (BMR) if we have enough information about the user
        guard let weight = weight, let height = height else {

            return nil
        }

        // Note the difference between calling +unitFromString: vs creating a unit from a string with
        // a given prefix. Both of these are equally valid, however one may be more convenient for a given
        // use case.
        let heightInCentimeters: Double = height.doubleValue(for: HKUnit(from:"cm"))
        let weightInKilograms: Double = weight.doubleValue(for: HKUnit.gramUnit(with: HKMetricPrefix.kilo))

        let nowDate = Date()
        let ageComponents: DateComponents = Calendar.current.dateComponents([Calendar.Component.year], from: dateOfBirth, to: nowDate)
        let ageInYears: Int = ageComponents.year!

        // BMR is calculated in kilocalories per day.
        let BMR: Double = self.calculateBMRFromWeight(weightInKilograms: weightInKilograms, height: heightInCentimeters, age: ageInYears, biologicalSex: biologicalSex.biologicalSex)

        // Figure out how much of today has completed so we know how many kilocalories the user has burned.
        let (startOfToday, endOfToday): (Date, Date) = self.datesFromToday()

        let secondsInDay: TimeInterval = endOfToday.timeIntervalSince(startOfToday)
        let percentOfDayComplete: Double = nowDate.timeIntervalSince(startOfToday) / secondsInDay

        let kilocaloriesBurned: Double = BMR * percentOfDayComplete

        let basalBurn = HKQuantity(unit: HKUnit.kilocalorie(), doubleValue: kilocaloriesBurned)

        return basalBurn
    }

/// Returns BMR value in kilocalories per day. Note that there are different ways of calculating the
    /// BMR. In this example we chose an arbitrary function to calculate BMR based on weight, height, age,
    /// and biological sex.
    private func calculateBMRFromWeight(weightInKilograms: Double, height heightInCentimeters: Double, age ageInYears: Int, biologicalSex: HKBiologicalSex) -> Double
    {
        var BMR: Double = 0

        if biologicalSex == .male {
            BMR = 66.0 + (13.8 * weightInKilograms) + (5.0 * heightInCentimeters) - (6.8 * Double(ageInYears))

            return BMR
        }

        BMR = 655 + (9.6 * weightInKilograms) + (1.8 * heightInCentimeters) - (4.7 * Double(ageInYears))

        return BMR
    }

我尝试使用示例应用程序来获取静止能量但是在健康应用程序和示例应用程序中显示的静止能量值不具有相同的值。

任何身体都能告诉我如何获取静息能量或健康应用程序用于查找静止能量的计算是什么？

如果有人可以给我一些指示，我会很高兴，我对HealthKit很新。

感谢。

Answer 1

看来苹果的样品已经过时了。从iOS 8和watchOS 2开始，有一个调用以与检索活动卡路里相同的方式检索此信息。只需更改标识符。 Apple Documentation

HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.basalEnergyBurned)

别忘了还包括读取此数据的附加权限。

如何从HealthKit获取静态能量值，其值与Health App的值相同？

1 个答案: