added respiratory rate samples method

RCTAppleHealthKit/RCTAppleHealthKit+Methods_Vitals.m

@@ -127,5 +127,40 @@
     }];
 }
 
+- (void)vitals_getRespiratoryRateSamples:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
+{
+    HKQuantityType *respiratoryRateType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierRespiratoryRate];
+
+    HKUnit *count = [HKUnit countUnit];
+    HKUnit *minute = [HKUnit minuteUnit];
+
+    HKUnit *unit = [RCTAppleHealthKit hkUnitFromOptions:input key:@"unit" withDefault:[count unitDividedByUnit:minute]];
+    NSUInteger limit = [RCTAppleHealthKit uintFromOptions:input key:@"limit" withDefault:HKObjectQueryNoLimit];
+    BOOL ascending = [RCTAppleHealthKit boolFromOptions:input key:@"ascending" withDefault:false];
+    NSDate *startDate = [RCTAppleHealthKit dateFromOptions:input key:@"startDate" withDefault:nil];
+    NSDate *endDate = [RCTAppleHealthKit dateFromOptions:input key:@"endDate" withDefault:[NSDate date]];
+    if(startDate == nil){
+        callback(@[RCTMakeError(@"startDate is required in options", nil, nil)]);
+        return;
+    }
+    NSPredicate * predicate = [RCTAppleHealthKit predicateForSamplesBetweenDates:startDate endDate:endDate];
+
+    [self fetchQuantitySamplesOfType:respiratoryRateType
+                                unit:unit
+                           predicate:predicate
+                           ascending:ascending
+                               limit:limit
+                          completion:^(NSArray *results, NSError *error) {
+        if(results){
+            callback(@[[NSNull null], results]);
+            return;
+        } else {
+            NSLog(@"error getting respiratory rate samples: %@", error);
+            callback(@[RCTMakeError(@"error getting respiratory rate samples", nil, nil)]);
+            return;
+        }
+    }];
+}
+
 
 @end

RCTAppleHealthKit/RCTAppleHealthKit.m

@@ -150,6 +150,11 @@ RCT_EXPORT_METHOD(getBloodPressureSamples:(NSDictionary *)input callback:(RCTRes
     [self vitals_getBloodPressureSamples:input callback:callback];
 }
 
+RCT_EXPORT_METHOD(getRespiratoryRateSamples:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
+{
+    [self vitals_getRespiratoryRateSamples:input callback:callback];
+}
+
 
 RCT_EXPORT_METHOD(getInfo:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
 {