Save Height to HealthKit

SaveHeight.m

double height = _txtHeight.text.doubleValue;
HKUnit *inchUnit = [HKUnit inchUnit];
HKQuantity *heightQuantity = [HKQuantity quantityWithUnit:inchUnit doubleValue:height];

HKQuantityType *heightType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeight];
NSDate *now = [NSDate date];

HKQuantitySample *heightSample = [HKQuantitySample quantitySampleWithType:heightType quantity:heightQuantity startDate:now endDate:now];

[self.healthStore saveObject:heightSample withCompletion:^(BOOL success, NSError *error) {
    [self retrieveHeight];
}];