I am trying to get heart rate data from health store but when I make a query there are samples that come through with timestamps that shows that there are minutes that go by between the sample measurements. I remember watching an apple video where they were talking about the Quantity series and how these series have one kind of container for multiple data points of bpm data. I also see in the samples that there is a unit of " ___ counts per second" for each of the results so it would make sense if there were multiple datapoints within each of the results from the query but I don't know how to see what's inside of the results or if there is even anything more to them.
This is the code I am using to retrieve the data:
public func fetchLatestHeartRateSample(completion: @escaping (_ samples: [HKQuantitySample]?) -> Void) {
/// Create sample type for the heart rate
guard let sampleType = HKObjectType
.quantityType(forIdentifier: .heartRate) else {
completion(nil)
return
}
/// Predicate for specifying start and end dates for the query
let predicate = HKQuery
.predicateForSamples(
withStart: Date.distantPast,
end: Date(),
options: .strictEndDate)
/// Set sorting by date.
let sortDescriptor = NSSortDescriptor(
key: HKSampleSortIdentifierStartDate,
ascending: false)
/// Create the query
let query = HKSampleQuery(
sampleType: sampleType,
predicate: predicate,
limit: Int(HKObjectQueryNoLimit),
sortDescriptors: [sortDescriptor]) { ( _, results, error) in
guard error == nil else {
print("Error: \(error!.localizedDescription)")
return
}
print(results ?? "Error printing results.")
completion(results as? [HKQuantitySample])
}
healthStore.execute(query)
}
Ultimately I want the most frequent heart rate data that is available. Ideally a bpm measurement every 5 - 10 seconds or less. Is this possible if I have not explicitly saved this heart rate data to the health store for a user before trying to access it or does Apple store all of this information in the health store regardless of the circumstances?
Any help is greatly appreciated!
