iOS HKHealthStore request authorization

gistfile1.m

HKHealthStore *healthStore = [[HKHealthStore alloc] init];

// Share body mass, height and body mass index
NSSet *shareObjectTypes = [NSSet setWithObjects:
                           [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyMass],
                           [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeight],
                           [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyMassIndex],
                           nil];

// Read date of birth, biological sex and step count
NSSet *readObjectTypes  = [NSSet setWithObjects:
                           [HKObjectType characteristicTypeForIdentifier:HKCharacteristicTypeIdentifierDateOfBirth],
                           [HKObjectType characteristicTypeForIdentifier:HKCharacteristicTypeIdentifierBiologicalSex],
                           [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount],
                           nil];

// Request access
[healthStore requestAuthorizationToShareTypes:shareObjectTypes
                                    readTypes:readObjectTypes
                                   completion:^(BOOL success, NSError *error) {
                                      
                                       if(success == YES)
                                       {
                                           // ...
                                       }
                                       else
                                       {
                                           // Determine if it was an error or if the
                                           // user just canceld the authorization request
                                       }
                                       
                                   }];