在Series 5 Watch and Watch OS6上使用`HKAnchoredObjectQuery`返回心率值的问题

Question

我正在使用HKAnchoredObjectQuery查询心率，因为我不想为此应用程序使用WorkoutBuilder API。该查询始终以正常采样率（每秒等）在锻炼过程中返回心率，但我注意到在Series 5 Watch OS 6.1上进行测试时，我只会看到非常零星的采样，例如一小时内获取5个心率。 HKAnchoredObjectQuery的文档中没有任何内容已弃用。知道为什么这种心率采集方法不再有效吗？

    func startHeartRateQuery(from startDate: Date, updateHandler: @escaping ([HKQuantitySample]) -> Void) {
        let typeIdentifier = HKQuantityTypeIdentifier.heartRate
        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
            }
            updateHandler(quantitySamples)

        }
    }


   //Generic helper function 
    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)
    }

Answer 1

很奇怪，但事实证明我在Watch App的设置中将“锻炼节电模式”设置为打开。除非意外设置，否则在安装Watch OS 6时将其设置为打开？将其关闭后，心率查询将再次正常返回。