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在 WWDC 2017 上，Apple 宣布添加vo2Max作为新的数量样本。为了返回 vo2Max 样本，必须有哪些变量？根据 Vo2Max 下的 Health App，“Apple Watch 会在您进行严格的户外步行或在 Workout 应用程序中跑步至少 20 分钟并持续测量心率时记录您预测的 vo2Max。” 听起来好像它对 3rd 方应用程序不可用，但是WWDC 2017 上 3:20 的这个剪辑听起来好像它应该可用？

.running 户外锻炼期间的以下代码即使在 20 分钟后也会返回和空数组：

func startVO2MaxQuery(from startDate: Date, updateHandler: @escaping ([HKQuantitySample]) -> Void) {
        let typeIdentifier = HKQuantityTypeIdentifier.vo2Max
        startQuery(ofType: typeIdentifier, from: startDate) { _, samples, _, _, error in
            guard let quantitySamples = samples as? [HKQuantitySample] else {
                print("Heart rate query failed with error: \(String(describing: error))")
                return
            }
            print("VO2Max samples = \(quantitySamples)")
            updateHandler(quantitySamples)

        }
    }



 private func startQuery(ofType type: HKQuantityTypeIdentifier, from startDate: Date, handler: @escaping
        (HKAnchoredObjectQuery, [HKSample]?, [HKDeletedObject]?, HKQueryAnchor?, Error?) -> Void) {
        let datePredicate = HKQuery.predicateForSamples(withStart: startDate, end: nil, options: .strictStartDate)
        let devicePredicate = HKQuery.predicateForObjects(from: [HKDevice.local()])
        let queryPredicate = NSCompoundPredicate(andPredicateWithSubpredicates:[datePredicate, devicePredicate])

        let quantityType = HKObjectType.quantityType(forIdentifier: type)!

        let query = HKAnchoredObjectQuery(type: quantityType, predicate: queryPredicate, anchor: nil,
                                          limit: HKObjectQueryNoLimit, resultsHandler: handler)
        query.updateHandler = handler
        healthStore.execute(query)

        activeDataQueries.append(query)
    }

权限 

 private func requestAccessToHealthKit() {
let healthStore = HKHealthStore()

let allTypes = Set([HKObjectType.workoutType(),
                    HKSeriesType.workoutRoute(),
                    HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!,
                    HKObjectType.quantityType(forIdentifier: .heartRate)!,
                    HKObjectType.quantityType(forIdentifier: .vo2Max)!,
                    HKObjectType.quantityType(forIdentifier: .stepCount)!,
                    HKObjectType.quantityType(forIdentifier: .distanceWalkingRunning)!])

healthStore.requestAuthorization(toShare: allTypes, read: allTypes) { (success, error) in
    if !success {
        print("failed HealthKit Authorization from iPhone \(String(describing: error?.localizedDescription))")
    }

    print("Successful HealthKit Authorization directly from the watch")
}

}

还有什么我需要做的吗？Apple 的文档非常少。

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