200 lines
7.3 KiB
Swift
200 lines
7.3 KiB
Swift
//
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// HealthKitHelper.swift
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// FitKit
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//
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// Created by Ian Fijolek on 1/14/18.
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// Copyright © 2018 iamthefij. All rights reserved.
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//
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import Foundation
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import HealthKit
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/// Helper class with class functions to simplify interraction with HealthKit
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class HealthKitHelper {
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private enum HealthKitSetupError: Error {
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case hkUnavailable
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case dataTypeUnavailable
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}
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private enum FitKitSaveError: Error {
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case sampleAlreadyExists
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}
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/// Attempts to authorize the application with HealthKit
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/// If HealthKit is unavailable or access is not provided to the requested
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/// types, an error will be passed into the callback.
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///
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/// - Parameter callback: Callback function for handling missing or unprovided
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/// access.
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class func authorizeHealthKit(_ callback: @escaping (Bool, Error?) -> Void) {
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// Verify Health data is available
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guard HKHealthStore.isHealthDataAvailable() else {
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callback(false, HealthKitSetupError.hkUnavailable)
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return
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}
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// This is not very well abstracted yet
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guard let bodyMass = HKObjectType.quantityType(forIdentifier: .bodyMass) else {
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callback(false, HealthKitSetupError.dataTypeUnavailable)
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return
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}
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// Request access to the specified metrics
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HKHealthStore().requestAuthorization(
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toShare: [bodyMass],
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read: [bodyMass],
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completion: callback
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)
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}
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/// Simplifies querying for HealthKit samples given types and predicates.
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/// This is executed async and will dispatch the callback on the main thread
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///
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/// - Parameters:
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/// - sampleType: The HKSampleType that you wish to query
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/// - predicate: An NSPredicate to use in the query
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/// - limit: Return a limited number of samples
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/// - callback: Callback to be executed on the main thread
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class func querySamplesWithPredicate(
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for sampleType: HKSampleType,
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withPredicate predicate: NSPredicate,
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limit: Int,
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callback: @escaping ([HKQuantitySample]?, Error?) -> Void)
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{
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let sortDescriptor = NSSortDescriptor(
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key: HKSampleSortIdentifierStartDate,
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ascending: false
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)
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let sampleQuery = HKSampleQuery(
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sampleType: sampleType,
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predicate: predicate,
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limit: limit,
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sortDescriptors: [sortDescriptor]
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) {
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(query, samples, error) in
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DispatchQueue.main.async {
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guard let samples = samples as? [HKQuantitySample] else {
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callback(nil, error)
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return
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}
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callback(samples, error)
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return
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}
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}
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HKHealthStore().execute(sampleQuery)
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}
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/// Provides easy query for the most recent sample of a given type
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///
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/// - Parameters:
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/// - sampleType: The HKSampleType that you wish to query
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/// - callback: Callback to be executed on the main thread
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class func queryMostRecentSample(for sampleType: HKSampleType, callback: @escaping (HKQuantitySample?, Error?) -> Void) {
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let mostRecentPredicate = HKQuery.predicateForSamples(
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withStart: Date.distantPast,
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end: Date(),
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options: .strictStartDate
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)
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self.querySamplesWithPredicate(for: sampleType, withPredicate: mostRecentPredicate, limit: 1) {
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samples, error in
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guard let sample = samples?.first else {
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callback(nil, error)
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return
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}
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callback(sample, nil)
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return
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}
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}
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/// Simple query for a HealthKit sample of a given type and Fitbit Id
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///
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/// - Parameters:
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/// - sampleType: The HKSampleType that you wish to query
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/// - logId: The Fitbit logId to be queried for (FitSample.logId)
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/// - callback: Callback to be executed on the main thread
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class func getSampleWithFitbitId(for sampleType: HKSampleType, withId logId: Int, callback: @escaping (HKQuantitySample?, Error?) -> Void) {
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let logIdEquals = HKQuery.predicateForObjects(withMetadataKey: "Fitbit Id", operatorType: .equalTo, value: logId)
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self.querySamplesWithPredicate(for: sampleType, withPredicate: logIdEquals, limit: 1) {
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samples, error in
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guard let sample = samples?.first else {
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callback(nil, error)
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return
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}
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callback(sample, nil)
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return
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}
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}
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/// Simple query for a HealthKit for a given FitSample
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///
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/// - Parameters:
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/// - fitSample: The FitSample that you wish to query for in HealthKit
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/// - callback: Callback to be executed on the main thread
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class func querySample(for fitSample: FitSample, callback: @escaping (HKQuantitySample?, Error?) -> Void) {
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self.querySamplesWithPredicate(
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for: fitSample.getSampleType(),
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withPredicate: fitSample.getPredicate(),
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limit: 1
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) {
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samples, error in
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guard let sample = samples?.first else {
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callback(nil, error)
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return
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}
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callback(sample, nil)
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return
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}
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}
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/// Save a FitSample to HealthKit
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///
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/// - Parameters:
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/// - sample: FitSample instance to save
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/// - callback: Callback function that will accept the completion from
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/// HealthKit
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class func saveFitSample(_ sample: FitSample, callback: @escaping (Bool, Error?) -> Void) {
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HKHealthStore().save(sample.makeSample(), withCompletion: callback)
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}
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/// Idempotent save of a FitSample to HealthKit. Before saving, executes an
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/// async query for the sample in HealthKit. If found, it will not save.
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///
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/// - Parameters:
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/// - sample: FitSample instance to save
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/// - callback: Callback funciton that accepts parameters indicating a
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/// success or failure and any error that is returned. In the case of an
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/// existing sample, it will be designated a success, but there it will
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/// also return a FitKitSaveError.sampleAlreadyExists error.
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class func maybeSaveSample(_ sample: FitSample, callback: @escaping (Bool, Error?) -> Void) {
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self.querySample(for: sample) {
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(existingSample, error) in
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if let error = error {
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NSLog("Error querying for sample")
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callback(false, error)
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return
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}
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if existingSample == nil {
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// Save only if no existing sample was found
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self.saveFitSample(sample) {
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(success, error) in
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if let error = error {
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NSLog("Error Saving Sample: \(error.localizedDescription)")
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callback(false, error)
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return
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} else {
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NSLog("Successfully saved Sample")
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callback(true, nil)
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return
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}
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}
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} else {
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NSLog("Sample already found in HealthKit. Will not save")
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callback(true, FitKitSaveError.sampleAlreadyExists)
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return
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}
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}
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}
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}
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