HealthKit examples

1 - get a health store.swift

let healthStore = HKHealthStore()

2 - get a type.swift

let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierBodyMass)

3 - authorize.swift

healthStore.requestAuthorizationToShareTypes(
  NSSet(objects: type),
  readTypes: NSSet(objects: type),
  completion: { (success: Bool, err: NSError!) -> () in
    println("hokay: \(success) error: \(err)")
  }
)

4 - query.swift

self.healthStore.executeQuery(HKSampleQuery(
    sampleType: type,
    predicate: HKQuery.predicateForSamplesWithStartDate(
        NSDate.distantPast() as NSDate,
        endDate: NSDate.distantFuture() as NSDate,
        options: .None
    ),
    limit: 0,
    sortDescriptors: nil,
    resultsHandler: { (query: HKSampleQuery!, results: [AnyObject]!, err: NSError?) -> Void in
        if err != nil {
            println(err)
            return
        }
        for result in results as [HKQuantitySample]! {
            println(result)
        }
    }
))

5 - save.swift

let now = NSDate()

self.healthStore.saveObject(
    HKQuantitySample(
        type: type,
        quantity: HKQuantity(unit: HKUnit(fromString: "lb"), doubleValue: 100),
        startDate: now,
        endDate: now,
        metadata: [HKMetadataKeyWasUserEntered: true]
    ),
    withCompletion: nil
)