如何解决实时心率记录时间间隔 - WatchOS
我创建了一个带有实时心率记录的手表应用程序,为此我使用了锻炼会话和 HKAnchoredObjectQuery 来获取结果。在这个苹果中提到,每 5 秒会更新一次心率值,但在我的情况下,最多需要 5-10 秒才能更新。我正在使用 watch 3,我需要每 5 秒收集一次值。
func startWorkout() {
if (session != nil) {
return
}
let workoutConfiguration = HKWorkoutConfiguration()
workoutConfiguration.activityType = .walking
workoutConfiguration.locationType = .outdoor
do {
session = try HKWorkoutSession(healthStore: healthStore,configuration: workoutConfiguration)
session?.delegate = self
} catch {
print("Unable to create the workout session!")
}
session?.startActivity(with: Date())
}
func startHeartRateStreamingQuery(_ workoutStartDate: Date){
guard let quantityType = HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.heartRate) else { return nil }
let datePredicate = HKQuery.predicateForSamples(withStart: workoutStartDate,end: nil,options: .strictEndDate )
let predicate = NSCompoundPredicate(andPredicateWithSubpredicates:[datePredicate])
let heartRateQuery = HKAnchoredObjectQuery(type: quantityType,predicate: predicate,anchor: nil,limit: Int(HKObjectQueryNoLimit)) { (query,sampleObjects,deletedObjects,newAnchor,error) -> Void in
self.updateHeartRate(sampleObjects)
}
heartRateQuery.updateHandler = {(query,samples,deleteObjects,error) -> Void in
self.updateHeartRate(samples)
}
healthStore.execute(heartRateQuery)
}
func updateHeartRate(_ samples: [HKSample]?) {
guard let heartRateSamples = samples as? [HKQuantitySample] else {return}
for sample in heartRateSamples {
let timeStamp = sample.startDate
let value = sample.quantity
print("\(timeStamp)_\(value)")
}
}
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