仅适用于 watchOS 2 的心率监测器应用程序会记录额外的卡路里并显示锻炼情况

Question

基本上，我正在开发一个监测心率的睡眠监测应用程序。所以，我不想开始任何锻炼活动，但我认为这就是苹果的工作方式！

这是我正在使用的仅心率代码：

@IBOutlet private weak var label: WKInterfaceLabel!
@IBOutlet private weak var deviceLabel : WKInterfaceLabel!
@IBOutlet private weak var heart: WKInterfaceImage!
@IBOutlet private weak var startStopButton : WKInterfaceButton!

let healthStore = HKHealthStore()

//State of the app - is the workout activated
var workoutActive = false

// define the activity type and location
var workoutSession : HKWorkoutSession?
let heartRateUnit = HKUnit(fromString: "count/min")
var anchor = HKQueryAnchor(fromValue: Int(HKAnchoredObjectQueryNoAnchor))


override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)
}

override func willActivate() {
    super.willActivate()

    guard HKHealthStore.isHealthDataAvailable() == true else {
        label.setText("not available")
        return
    }

    guard let quantityType = HKQuantityType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeartRate) else {
        displayNotAllowed()
        return
    }

    let dataTypes = Set(arrayLiteral: quantityType)
    healthStore.requestAuthorizationToShareTypes(nil, readTypes: dataTypes) { (success, error) -> Void in
        if success == false {
            self.displayNotAllowed()
        }
    }
}

func displayNotAllowed() {
    label.setText("not allowed")
}

func workoutSession(workoutSession: HKWorkoutSession, didChangeToState toState: HKWorkoutSessionState, fromState: HKWorkoutSessionState, date: NSDate) {
    switch toState {
    case .Running:
        workoutDidStart(date)
    case .Ended:
        workoutDidEnd(date)
    default:
        print("Unexpected state \(toState)")
    }
}

func workoutSession(workoutSession: HKWorkoutSession, didFailWithError error: NSError) {
    // Do nothing for now
    NSLog("Workout error: \(error.userInfo)")
}

func workoutDidStart(date : NSDate) {
    if let query = createHeartRateStreamingQuery(date) {
        healthStore.executeQuery(query)
    } else {
        label.setText("cannot start")
    }
}

func workoutDidEnd(date : NSDate) {
    if let query = createHeartRateStreamingQuery(date) {
        healthStore.stopQuery(query)
        label.setText("---")
    } else {
        label.setText("cannot stop")
    }
}

// MARK: - Actions
@IBAction func startBtnTapped() {
    if (self.workoutActive) {
        //finish the current workout
        self.workoutActive = false
        self.startStopButton.setTitle("Start")
        if let workout = self.workoutSession {
            healthStore.endWorkoutSession(workout)
        }
    } else {
        //start a new workout
        self.workoutActive = true
        self.startStopButton.setTitle("Stop")
        startWorkout()
    }

}

func startWorkout() {
    self.workoutSession = HKWorkoutSession(activityType: HKWorkoutActivityType.CrossTraining, locationType: HKWorkoutSessionLocationType.Indoor)
    self.workoutSession?.delegate = self
    healthStore.startWorkoutSession(self.workoutSession!)
}

func createHeartRateStreamingQuery(workoutStartDate: NSDate) -> HKQuery? {
    // adding predicate will not work
     // let predicate = HKQuery.predicateForSamplesWithStartDate(workoutStartDate, endDate: nil, options: HKQueryOptions.None)

    guard let quantityType = HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeartRate) else { return nil }

    let heartRateQuery = HKAnchoredObjectQuery(type: quantityType, predicate: nil, anchor: anchor, limit: Int(HKObjectQueryNoLimit)) { (query, sampleObjects, deletedObjects, newAnchor, error) -> Void in
        guard let newAnchor = newAnchor else {return} 
        self.anchor = newAnchor
        self.updateHeartRate(sampleObjects)
    }

    heartRateQuery.updateHandler = {(query, samples, deleteObjects, newAnchor, error) -> Void in
        self.anchor = newAnchor!
        self.updateHeartRate(samples)
    }
    return heartRateQuery
}

func updateHeartRate(samples: [HKSample]?) {
    guard let heartRateSamples = samples as? [HKQuantitySample] else {return}

    dispatch_async(dispatch_get_main_queue()) {
        guard let sample = heartRateSamples.first else{return}
        let value = sample.quantity.doubleValueForUnit(self.heartRateUnit)
        self.label.setText(String(UInt16(value)))

        // retrieve source from sample
        let name = sample.sourceRevision.source.name
        self.updateDeviceName(name)
        self.animateHeart()
    }
}

func updateDeviceName(deviceName: String) {
    deviceLabel.setText(deviceName)
}

func animateHeart() {
    self.animateWithDuration(0.5) {
        self.heart.setWidth(60)
        self.heart.setHeight(90)
    }

    let when = dispatch_time(DISPATCH_TIME_NOW, Int64(0.5 * double_t(NSEC_PER_SEC)))
    let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
    dispatch_after(when, queue) {
        dispatch_async(dispatch_get_main_queue(), {
            self.animateWithDuration(0.5, animations: {
                self.heart.setWidth(50)
                self.heart.setHeight(80)
            })
        })
    }
} }

总而言之，意想不到的观察结果是： 1. 我监测心率的时间有助于活动应用程序中的绿环。 2. 记录了意想不到的大量卡路里，即当人在床上或睡觉时！

能否请您提供正确的代码，帮助我在睡眠期间定期监控和显示一个人的心跳，而不会对绿环或额外的卡路里做出贡献。 ?

提前非常感谢！

Answer 1

开始锻炼并运行心率监测器会在大约 6 小时后耗尽 Apple Watch 的电池电量（如果它已充满电），因此此时让它在睡觉时连续运行可能不太现实。

据我所知，使用锻炼会话开始锻炼对您的应用有 2 项作用。它将您的应用程序保持在前台，并每隔几秒钟开始采集心率样本。有没有考虑不开始？您的健康包查询仍将按原样工作，心率监测器仍会每 15 分钟左右记录一次用户的心率。您放松的主要事情是将您的应用程序保持在前台，我想知道您是否需要这样做（因为用户会睡着）。

从 healthkit 中检索最后一个心率样本：

func getLatestHeartRate() {
    let quantityType = HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeartRate)!
    let sortDescriptor = NSSortDescriptor(key:HKSampleSortIdentifierStartDate, ascending: false)
    let sampleQuery = HKSampleQuery(sampleType: quantityType, predicate: nil, limit: 1, sortDescriptors: [sortDescriptor])
        { (sampleQuery, results, error ) -> Void in

    }
    self.healthStore.executeQuery(sampleQuery)
}