watchOS 2 的心率监测器专用应用程序可记录额外的卡路里并显示运动

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. 记录了意想不到的高热量，即当人躺在床上或睡觉时！

您能否帮助使用正确的代码，帮助我在睡眠期间定期监测和显示一个人的心跳，而无需为绿环做出贡献或贡献额外的卡路里。

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（如果它充满电），因此让它在睡觉时连续运行此时可能并不现实。

据我所知，使用锻炼会话开始锻炼对您的应用程序有两件事。它将你的应用保持在前台，并且每隔几秒钟就开始采集心率样本。你有没有考虑过不开始它？您的健康工具包查询仍将按原样工作，心率监测器仍会每隔 15 分钟左右记录一次用户的心率。您丢失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）。

要从健康工具包中检索最后一个心率样本，请执行以下操作：

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)
}