Clean bill of HealthKit Making the most of health data Josh Johnson | Two Toasters | @jnjosh 

“I’m not a doctor. I don’t even play one on TV.” — Me, just now. 

“What is this, the Dark Ages?” — Doctor Leonard “Bones” McCoy 

“Hello Computer” — Scotty 

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“So, What is is this HealthKit thing?” — You, hopefully. 

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The HealthKit Crash Course™ 

WWDC 2014 Session 203: Introducing HealthKit https://developer.apple.com/videos/wwdc/2014/?id=203 

HKHealthStore self.healthStore = [[HKHealthStore alloc] init]; 

HKHealthStore // … [self.healthStore requestAuthorizationToShareTypes:writeTypes readTypes:readTypes completion:^(BOOL success, NSError *error) { // Do something! }]; 

HKObjectType HKQuantityType *stepType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; NSSet *writeTypes = [NSSet setWithObject:stepType]; NSSet *readTypes = [NSSet setWithObject:stepType]; 

HKObjectType HKQuantityType *stepType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; NSSet *writeTypes = [NSSet setWithObject:stepType]; NSSet *readTypes = [NSSet setWithObject:stepType]; [self.healthStore requestAuthorizationToShareTypes:writeTypes readTypes:readTypes completion:^(BOOL success, NSError *error) { // Do something! }]; 

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HKHealthStore [self.healthStore whatElseCanYouDo]; 

HKHealthStore — Saving HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; // … 

HKUnit HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; HKQuantity *stepQuantity = [HKQuantity quantityWithUnit:[HKUnit countUnit] doubleValue:stepCount]; // … 

HKQuantitySample HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; HKQuantity *stepQuantity = [HKQuantity quantityWithUnit:[HKUnit countUnit] doubleValue:stepCount]; HKQuantitySample *stepSample = [HKQuantitySample quantitySampleWithType:stepQuantityType quantity:stepQuantity startDate:someStartDate endDate:someEndDate]; 

HKHealthStore — Saving // … [self.healthStore saveObject:stepSample withCompletion:^(BOOL success, NSError *error) { // You better check that error. }]; 

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HKHealthStore — Querying 

HKHealthStore — Querying HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; //… 

HKHealthStore — Querying HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; NSPredicate *appPredicate = [HKSampleQuery predicateForObjectsFromSource:[HKSource defaultSource]]; //… 

HKHealthStore — Querying HKQuantityType *stepQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; NSPredicate *appPredicate = [HKSampleQuery predicateForObjectsFromSource:[HKSource defaultSource]]; HKSampleQuery *stepQuery = [[HKSampleQuery alloc] initWithSampleType:stepQuantityType predicate:appPredicate limit:HKObjectQueryNoLimit sortDescriptors:nil resultsHandler:^(HKSampleQuery *query, NSArray *results, NSError *error) { // results will be delivered as HKSamples. In this case, HKQuantitySamples. // You should also handle that Error! }]; //… 

HKHealthStore — Querying //… stepQuery created [self.healthStore executeQuery:stepQuery]; 

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“Let’s build something cool instead.” — All of us, just now. 

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Demo 

With great power comes great responsibility. 

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Thank you! Questions? Josh Johnson | Two Toasters | @jnjosh 

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