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Created September 17, 2014 21:34
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Save Weight to HealthKit
double weight = _txtWeight.text.doubleValue;
HKUnit *poundUnit = [HKUnit poundUnit];
HKQuantity *weightQuantity = [HKQuantity quantityWithUnit:poundUnit doubleValue:weight];
HKQuantityType *weightType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyMass];
NSDate *now = [NSDate date];
HKQuantitySample *weightSample = [HKQuantitySample quantitySampleWithType:weightType quantity:weightQuantity startDate:now endDate:now];
[self.healthStore saveObject:weightSample withCompletion:^(BOOL success, NSError *error) {
[self retrieveWeight];
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