How to read HealthKit heart rate data?

Question

I know this questions been asked, but hasn't really been answered. I've tried things from threads like this: Heart Rate With Apple's Healthkit

I tried converting this from Objective-C to Swift but didn't work.

My question is, what's the best way to read heart rate data from HealthKit.I want to be able to read every heart rate measurement from the time it started taking them, and I want to be able to see the time/day stamps of said measurements.

I asked for permission here:

import Foundation
import UIKit
import HealthKit

class HealthKitManager: NSObject {

static let healthKitStore = HKHealthStore()

static func authorizeHealthKit() {
    
    let healthKitTypes: Set = [
        HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeartRate)!,
    ]
    
    healthKitStore.requestAuthorizationToShareTypes(healthKitTypes,
                                                    readTypes: healthKitTypes) { _, _ in }
    }
}

Here is my view Controller code for now (I'm not sure why this doesn't work):

import UIKit
import HealthKit

class ViewController: UIViewController {

let health: HKHealthStore = HKHealthStore()
let heartRateUnit:HKUnit = HKUnit(fromString: "count/min")
let heartRateType:HKQuantityType   = HKQuantityType.quantityTypeForIdentifier(HKQuantityTypeIdentifierHeartRate)!
var heartRateQuery:HKQuery?


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

     @IBAction func authorizeTapped(sender: AnyObject) {
    print("button tapped")
    self.createStreamingQuery()
    HealthKitManager.authorizeHealthKit()
    
}


func createStreamingQuery() -> HKQuery
{
    let queryPredicate  = HKQuery.predicateForSamplesWithStartDate(NSDate(), endDate: nil, options: .None)
    
    let query:HKAnchoredObjectQuery = HKAnchoredObjectQuery(type: self.heartRateType, predicate: queryPredicate, anchor: nil, limit: Int(HKObjectQueryNoLimit))
    { (query:HKAnchoredObjectQuery, samples:[HKSample]?, deletedObjects:[HKDeletedObject]?, anchor:HKQueryAnchor?, error:NSError?) -> Void in
        
        if let errorFound:NSError = error
        {
            print("query error: \(errorFound.localizedDescription)")
        }
        else
        {
            //printing heart rate
            if let samples = samples as? [HKQuantitySample]
            {
                if let quantity = samples.last?.quantity
                {
                    print("\(quantity.doubleValueForUnit(self.heartRateUnit))")
                }
            }
        }
    }
    
    query.updateHandler =
        { (query:HKAnchoredObjectQuery, samples:[HKSample]?, deletedObjects:[HKDeletedObject]?, anchor:HKQueryAnchor?, error:NSError?) -> Void in
            
            if let errorFound:NSError = error
            {
                print("query-handler error : \(errorFound.localizedDescription)")
            }
            else
            {
                //printing heart rate
                if let samples = samples as? [HKQuantitySample]
                {
                    if let quantity = samples.last?.quantity
                    {
                        print("\(quantity.doubleValueForUnit(self.heartRateUnit))")
                    }
                }
            }//eo-non_error
    }//eo-query-handler
    
    return query
}


}

I can't get anything to print to the console, which is really just what I want.

How to read HealthKit heart rate data?

Answers (1)

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