Strava Apple Watch Blog - HealthKit

HealthKit_Permission.m

/// After using `requestAuthorizationToShareTypes:readTypes:completion:`
- (BOOL)hasRequestedHeartRateAuthorization
{
    return (HKAuthorizationStatusNotDetermined != [HKHealthStore authorizationStatusForType:[HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate]]);
}

- (void)requestHeartRateAuthorizationWithCompletion:(void (^)(BOOL succes, NSError *error))completion
{
    NSSet *readTypes = [NSSet setWithObject:[HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate]];
    [self.store requestAuthorizationToShareTypes:nil readTypes:readTypes completion:^(BOOL success, NSError *error){
        completion(success, error);
    }];
}