hk_write_steps_1.m

/**
    Write Steps
 */
- (void)writeSteps:(NSInteger)steps
         startDate:(NSDate *)startDate
           endDate:(NSDate *)endDate
   withFinishBlock:(void (^)(NSError *error))finishBlock
{
    // write steps
    // quantity type :  steps
    HKQuantityType *stepsQuantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];
    // generate count unit
    HKUnit *unit = [HKUnit countUnit];
    // generate quantity object with step count value
    HKQuantity *quantity = [HKQuantity quantityWithUnit:unit doubleValue:steps];
    // generate quantity sample object
    HKQuantitySample *sample = [HKQuantitySample quantitySampleWithType:stepsQuantityType quantity:quantity startDate:startDate endDate:endDate];
    // save sample object using health-store object
    [self.healthStore saveObject:sample withCompletion:^(BOOL success, NSError * _Nullable error) {
        
        NSLog(@"Saving steps to healthStore - success: %@", success ? @"YES" : @"NO");        
        dispatch_sync(dispatch_get_main_queue(), ^{
            finishBlock(error);
        });
    }];
}