How to get and update height in Healthkit in swift 3?

Question

I am trying to get and update height from Healthkit but not getting any document for swift 3.

Is there any way to get height from healthKit also to update height in healthKit?

Answer 1

Create an healthkit instance

let healthKitStore:HKHealthStore = HKHealthStore()

Request Permission

func requestPermissions(completion: @escaping ((_ success:Bool, _ error:Error?) -> Void)){
    let healthKitTypesToRead : Set<HKSampleType> = [
        HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.height)!,
        HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.bodyMass)!,
    ]

    let healthKitTypesToWrite: Set<HKSampleType> = [
        HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.height)!,
        HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.bodyMass)!,
    ]

    if !HKHealthStore.isHealthDataAvailable() {
        print("Error: HealthKit is not available in this Device")
        completion(false, error)
        return
    }

    healthKitStore.requestAuthorization(toShare: healthKitTypesToWrite, read: healthKitTypesToRead) { (success, error) -> Void in
        completion(success,error )
    }

}

Reading Height

let heightType = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.height)!
let query = HKSampleQuery(sampleType: heightType, predicate: nil, limit: 1, sortDescriptors: nil) { (query, results, error) in
    if let result = results?.first as? HKQuantitySample{
        print("Height => \(result.quantity)")
    }else{
        print("OOPS didnt get height \nResults => \(results), error => \(error)")
    }
}
self.healthKitStore.execute(query)

Writing Height

let height = YOUR_HEIGHT

if let type = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.height) {
    let date = Date()
    let quantity = HKQuantity(unit: HKUnit.inch(), doubleValue: height!)
    let sample = HKQuantitySample(type: type, quantity: quantity, start: date, end: date)
    self.healthKitStore.save(sample, withCompletion: { (success, error) in
        print("Saved \(success), error \(error)")
    })
}

Now if you want to read and write Weight then just use

HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.bodyMass)

Note: Don't forget to add these permissions

Privacy - Health Update Usage Description

Privacy - Health Share Usage Description

Hope this is helpful to others who are still searching for it