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HealthKit

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This presentation is about iOS HealthKit basically and prepared for SWE-551 LightWeight Client Programming course at Bogazici University

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HealthKit

  1. 1. HealthKit Busra Deniz SWE-551, Fall 2015
  2. 2. HealthKit Overview ● HealthKit allows apps that provide health and fitness services to share their data with the new Health app and with each other. ● A user’s health information is stored in a centralized and secure location and the user decides which data should be shared with your app ● HealthKit is designed to manage data from a wide range of sources, automatically merging data from all different sources based on users’ preferences. ● Works with directly health and fitness devices.
  3. 3. HealthKit Overview ● Provides an app to help manage users’ health data. ● View, add, delete and manage health and fitness data using this app ● Edit sharing permissions for each data type ● Both HealthKit and Health app are unavailable on iPad ● The HealthKit framework cannot be used in an app extension
  4. 4. HealthKit and Privacy ● The user must explicitly grant each app permission to read and write data to HealthKit store. Users can grant or deny permission separately for each type of data ● The HealthKit data is only kept locally on the user’s device ● For security, the HealthKit store is encrypted when the device is not unlocked ● The HealthKit store can only be accessed by an authorized app. Not accessible from extensions or a WatchKit app ● Your app must not access the HealthKit APIs unless the app is primarily designed to provide health or fitness services
  5. 5. HealthKit Benefits ● Separating data collection, data processing, and socialization ● Reduces friction in sharing between apps ● Providing a richer set of data and a greater sense of context ● Lets apps participate in a greater ecosystem
  6. 6. HealthKit’s Design Philosophy ● The framework constrains the types of data and units to a predefined list. Developers cannot create custom data types or units ● All objects in the HealthKit store are subclasses of the HKObject class ○ UUID ○ Source ○ Metadata ● HealthKit objects can be divided into two main groups : ○ Characteristics ○ Samples
  7. 7. HealthKit’s Design Philosophy ● Characteristic objects represent data that typically does not change. This data includes the user’s birthdate, blood type, and biological sex ● Sample objects represent data at a particular point in time. Subclasses of HKSample class ○ Type ○ Start date ○ End date ● Samples can be further partitioned into four sample types : ○ Category samples ○ Quantity samples ○ Correlations ○ Workouts
  8. 8. Setting Up HealthKit
  9. 9. Setting Up HealthKit ● Check to see whether HealthKit is available by calling the isHealthDataAvailable method ● Instantiate an HKHealthStore object for your app. You need only one HealthKit store per app. ● Request authorization to access HealthKit data using the requestAuthorizationToShareTypes:readTypes:completion: method. HealthKit requires fine-grained authorization. You must request permission to share and read each type of data.
  10. 10. Sample Code import HealthKit let healthKitStore:HKHealthStore = HKHealthStore() func authorizeHealthKit(completion: ((success:Bool, error:NSError!) -> Void)!) { // 1. Set the types you want to read from HK Store let healthKitTypesToRead = Set(arrayLiteral:[ HKObjectType.characteristicTypeForIdentifier(HKCharacteristicTypeIdentifierDateOfBirth), HKObjectType.characteristicTypeForIdentifier(HKCharacteristicTypeIdentifierBloodType), HKObjectType.workoutType() ]) // 2. Set the types you want to write to HK Store let healthKitTypesToWrite = Set(arrayLiteral:[ HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierActiveEnergyBurned), HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierDistanceWalkingRunning), HKQuantityType.workoutType() ]) // Continue
  11. 11. Sample Code Continue // 3. If the store is not available (for instance, iPad) return an error and don't go on. if !HKHealthStore.isHealthDataAvailable() { let error = NSError(domain: "com.example.healthkit", code: 2, userInfo: [NSLocalizedDescriptionKey:" HealthKit is not available in this Device"]) if( completion != nil ) { completion(success:false, error:error) } return; } // 4. Request HealthKit authorization healthKitStore.requestAuthorizationToShareTypes(healthKitTypesToWrite, readTypes: healthKitTypesToRead) { (success, error) -> Void in if( completion != nil ) { completion(success:success,error:error) } } }
  12. 12. Sample Code Continue healthManager.authorizeHealthKit { (authorized, error) -> Void in if authorized { println("HealthKit authorization received.") } else { println("HealthKit authorization denied!") if error != nil { println("(error)") } } }
  13. 13. Read Characteristics func readCharacteristics() -> ( biologicalsex:HKBiologicalSexObject?, bloodtype:HKBloodTypeObject?) { var error:NSError? // Read biological sex var biologicalSex:HKBiologicalSexObject? = healthKitStore.biologicalSexWithError(&error); if error != nil { println("Error reading Biological Sex: (error)") } // Read blood type var bloodType:HKBloodTypeObject? = healthKitStore.bloodTypeWithError(&error); if error != nil { println("Error reading Blood Type: (error)") } // Return the information return (biologicalSex, bloodType) }
  14. 14. Samples Query func readMostRecentSample(sampleType:HKSampleType , completion: ((HKSample!, NSError!) -> Void)!) { // 1. Build the Predicate let past = NSDate.distantPast() as! NSDate let now = NSDate() let mostRecentPredicate = HKQuery.predicateForSamplesWithStartDate(past, endDate:now, options: .None) // 2. Build the sort descriptor to return the samples in descending order let sortDescriptor = NSSortDescriptor(key:HKSampleSortIdentifierStartDate, ascending: false) // 3. we want to limit the number of samples returned by the query to just 1 (the most recent) let limit = 1 // 4. Build samples query let sampleQuery = HKSampleQuery(sampleType: sampleType, predicate: mostRecentPredicate, limit: limit, sortDescriptors: [sortDescriptor]) { (sampleQuery, results, error ) -> Void in if let queryError = error { completion(nil,error) return; } // Get the first sample let mostRecentSample = results.first as? HKQuantitySample // Execute the completion closure if completion != nil { completion(mostRecentSample,nil) } } // 5. Execute the Query self.healthKitStore.executeQuery(sampleQuery) }
  15. 15. Save New Samples func saveBMISample(bmi:Double, date:NSDate ) { // 1. Create a BMI Sample let bmiType = HKQuantityType.quantityTypeForIdentifier(HKQuantityTypeIdentifierBodyMassIndex) let bmiQuantity = HKQuantity(unit: HKUnit.countUnit(), doubleValue: bmi) let bmiSample = HKQuantitySample(type: bmiType, quantity: bmiQuantity, startDate: date, endDate: date) // 2. Save the sample in the store healthKitStore.saveObject(bmiSample, withCompletion: { (success, error) -> Void in if( error != nil ) { println("Error saving BMI sample: (error.localizedDescription)") } else { println("BMI sample saved successfully!") } }) }
  16. 16. Classes https://developer.apple. com/library/ios/documentation/HealthKit/Reference/HealthKit_Framework/
  17. 17. References ● https://developer.apple. com/library/ios/documentation/HealthKit/Reference/HealthKit_Framewor k/ ● http://www.raywenderlich.com/86336/ios-8-healthkit-swift-getting-started ● http://code.tutsplus.com/tutorials/getting-started-with-healthkit-part-1-- cms-24477 ● http://www.raywenderlich.com/89733/healthkit-tutorial-with-swift- workouts

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