ios - WatchOS 4 没有收到心率样本？

Question

使用来自 SpeedySloth 的 Apple 示例代码，我在模拟器上获取心率样本，但在运行 WatchOS 4.1 的 Series 0 Apple Watch 上没有获取任何样本。这是一个错误吗？还有谁有相同的问题吗？

代码:

 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
            }
            print("heartRate samples = \(quantitySamples)")
            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

我在相同的 Apple 示例代码中遇到了同样的问题。几个月前在 WatchOS 4.1 上试过之后，我可以放心地假设它从 4.2 开始就坏了。

不过，我只需向健康商店申请必要的 HK 授权，就可以让它发挥作用。只需像这样覆盖初始化程序或 HealthStoreManager.swift:

// HealthStoreManager.swift

override init() {
    super.init()
    let allTypes = Set([HKObjectType.workoutType(),
                        HKSeriesType.workoutRoute(),
                        HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!,
                        HKObjectType.quantityType(forIdentifier: .distanceWalkingRunning)!])

    healthStore.requestAuthorization(toShare: allTypes, read: allTypes) { (success, error) in
        if !success {
            print(error?.localizedDescription ?? "")
        }
    }
}

从头开始重新安装该应用程序，它现在应该可以正常工作了。