Htykuut

I am working on a step app. I want to retrieve Healthkit data from the health app, but I don't know how to do it. I can't find anything on the internet. I want to get the steps data from the health app.

For Asking permission asking permission

if HKHealthStore.isHealthDataAvailable() {

    var writeDataTypes: Set<AnyHashable> = self.dataTypesToWrite()

    var readDataTypes: Set<AnyHashable> = self.dataTypesToRead()

    self.healthStore.requestAuthorization(toShareTypes: writeDataTypes, readTypes: readDataTypes, completion: {(_ success: Bool, _ error: Error) -> Void in

        if !success {

            print("You didn't allow HealthKit to access these read/write data types. In your app, try to handle this error gracefully when a user decides not to provide access. The error was: (error). If you're using a simulator, try it on a device.")

            return

        }

    })

}

To write Data

func dataTypesToWrite() -> Set<AnyHashable> {

    var heightType: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .height)

    var weightType: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bodyMass)

    var systolic: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bloodPressureSystolic)

    var dystolic: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bloodPressureDiastolic)

    return Set<AnyHashable>([heightType, weightType, systolic, dystolic])

}

To read data from health kit

func dataTypesToRead() -> Set<AnyHashable> {

    var heightType: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .height)

    var weightType: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bodyMass)

    var systolic: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bloodPressureSystolic)

    var dystolic: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .bloodPressureDiastolic)

    var sleepAnalysis: HKCategoryType? = HKObjectType.categoryType(forIdentifier: .sleepAnalysis)

    var step: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .stepCount)

    var walking: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .distanceWalkingRunning)

    var cycling: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .distanceCycling)

    var basalEnergyBurned: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .basalEnergyBurned)

If you want to get the step count for last week then you can follow this bellow code

self.healthStore = HKHealthStore()

var calendar = Calendar.current

var interval = DateComponents()

interval.day = 1

var anchorComponents: DateComponents? = calendar.dateComponents([.day, .month, .year], from: Date())

anchorComponents?.hour = 0

var anchorDate: Date? = calendar.date(fromComponents: anchorComponents)

var quantityType: HKQuantityType? = HKObjectType.quantityType(forIdentifier: .stepCount)

    // Create the query

var query = HKStatisticsCollectionQuery(quantityType, quantitySamplePredicate: nil, options: HKStatisticsOptionCumulativeSum, anchorDate: anchorDate, intervalComponents: interval)

// Set the results handler

query.initialResultsHandler = {(_ query: HKStatisticsCollectionQuery, _ results: HKStatisticsCollection, _ error: Error) -> Void in

    if error != nil {

        // Perform proper error handling here

        print("*** An error occurred while calculating the statistics: (error?.localizedDescription) ***")

    }

    var endDate = Date()

    var startDate: Date? = calendar.date(byAddingUnit: .day, value: -7, to: endDate, options: 0)

    // Plot the daily step counts over the past 7 days

    results.enumerateStatistics(from: startDate, to: endDate, block: {(_ result: HKStatistics, _ stop: Bool) -> Void in

        var quantity: HKQuantity? = result.sumQuantity()

        if quantity != nil {

            var date: Date? = result.startDate

            var value: Double? = quantity?.doubleValue(forUnit: HKUnit.count())

            totalStepsCount = String(format: "%.f", value)

            DispatchQueue.main.async(execute: {() -> Void in

                self.calculateStepCountAndShow()

            })

            print("(date): (value)")

        }

    })

}

self.healthStore.executeQuery(query)

}

There are many tutorials on internet to use healthkit

to setup healthkit in your app and for permissions follow one of these tutorials

1. follow official documentation
   


2. Appcoda's HealthKit introduction
   


3. Sample app tutorial and


4. Raywenderlich tutorial

for example if we want to retrieve sleeping analysis data,

func retrieveSleepAnalysis() {



    // first, we define the object type we want

    if let sleepType = HKObjectType.categoryTypeForIdentifier(HKCategoryTypeIdentifierSleepAnalysis) {



        // Use a sortDescriptor to get the recent data first

        let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)



        // we create our query with a block completion to execute

        let query = HKSampleQuery(sampleType: sleepType, predicate: nil, limit: 30, sortDescriptors: [sortDescriptor]) { (query, tmpResult, error) -> Void in



            if error != nil {



                // something happened

                return



            }



            if let result = tmpResult {



                // do something with my data

                for item in result {

                    if let sample = item as? HKCategorySample {

                        let value = (sample.value == HKCategoryValueSleepAnalysis.InBed.rawValue) ? "InBed" : "Asleep"

                        print("Healthkit sleep: (sample.startDate) (sample.endDate) - value: (value)")

                    }

                }

            }

        }



        // finally, we execute our query

        healthStore.executeQuery(query)

    }

}

You need to enable healthkit from project capabilities
then you will go through authentication process, then you will start implementing a query to retrieve the data using HKSampleQuery , kindly follow this tutorial

as the code is long to be included here :)