add saveBodyFatPercentage

RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.h

@@ -23,6 +23,8 @@
 - (void)body_saveHeight:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
 
 - (void)body_getLatestBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
+- (void)body_saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
+
 - (void)body_getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
 
 @end

RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.m

@@ -257,6 +257,30 @@
 }
 
 
+- (void)body_saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
+{
+    
+    double percentage = [RCTAppleHealthKit doubleValueFromOptions:input];
+    NSDate *sampleDate = [RCTAppleHealthKit dateFromOptionsDefaultNow:input];
+    HKUnit *unit = [HKUnit percentUnit];
+    
+    percentage = percentage / 100;
+
+    HKQuantity *bodyFatPercentQuantity = [HKQuantity quantityWithUnit:unit doubleValue:percentage];
+    HKQuantityType *bodyFatPercentType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyFatPercentage];
+    HKQuantitySample *bodyFatPercentSample = [HKQuantitySample quantitySampleWithType:bodyFatPercentType quantity:bodyFatPercentQuantity startDate:sampleDate endDate:sampleDate];
+    
+    [self.healthStore saveObject:bodyFatPercentSample withCompletion:^(BOOL success, NSError *error) {
+        if (!success) {
+            NSLog(@"error saving body fat percent sample: %@", error);
+            callback(@[RCTMakeError(@"error saving body fat percent sample", error, nil)]);
+            return;
+        }
+        callback(@[[NSNull null], @(percentage)]);
+    }];
+}
+
+
 - (void)body_getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
 {
     HKQuantityType *leanBodyMassType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierLeanBodyMass];

RCTAppleHealthKit/RCTAppleHealthKit.m

@@ -99,6 +99,11 @@ RCT_EXPORT_METHOD(getLatestBodyFatPercentage:(NSDictionary *)input callback:(RCT
     [self body_getLatestBodyFatPercentage:input callback:callback];
 }
 
+RCT_EXPORT_METHOD(saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
+{
+    [self body_saveBodyFatPercentage:input callback:callback];
+}
+
 RCT_EXPORT_METHOD(getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
 {
     [self body_getLatestLeanBodyMass:input callback:callback];

README.md

@@ -142,6 +142,7 @@ AppleHealthKit.initHealthKit(options: Object, (err: string, results: Object) =>
       * [saveMindfulSession](/docs/saveMindfulSession().md)
       * [saveWeight](/docs/saveWeight().md)
       * [saveSteps](/docs/saveSteps().md)
+      * [saveBodyFatPercentage](/docs/saveBodyFatPercentage().md)
   * [References](#references)
 
 ## Supported Apple Permissions
@@ -171,6 +172,7 @@ The available Healthkit permissions to use with `initHealthKit`
 | StepCount              | [HKQuantityTypeIdentifierStepCount](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierstepcount?language=objc)                               | ✓    | ✓     |
 | Steps                  | [HKQuantityTypeIdentifierSteps](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifiersteps?language=objc)                                       | ✓    | ✓     |
 | Weight                 | [HKQuantityTypeIdentifierBodyMass](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierbodymass?language=objc)                                 | ✓    | ✓     |
+| BodyFatPercentage      | [HKQuantityTypeIdentifierBodyFatPercentage](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierbodyfatpercentage?language=objc)                                 | ✓    | ✓     |
 
 These permissions are exported as constants of the `rn-apple-healthkit` module.
 

docs/saveBodyFatPercentage().md

+save a percentage body fat value to Healthkit
+
+`saveBodyFatPercentage` accepts an options object containing a percent value:
+```javascript
+let options = {
+  value: 16.7 // 16.7%
+}
+```
+
+```javascript
+AppleHealthKit.saveBodyFatPercentage(options: Object, (err: Object, results: Object) => {
+  if (err) {
+    return;
+  }
+  // body fat percentage successfully saved
+});
+```