objective-c - 如何在 iOS 中读取 HealthKit 的血压数据？

Question

我在尝试弄清楚如何在 HealthKit 中读取血压数据时遇到问题，特别是因为了解 HKCorrelationQuery 如何为 Objective C 测量血压在开发者网站或教程中没有详细记录。

Answer 1

我使用以下代码通过 HealthKit 读取血压数据。我发现您无法直接读取收缩压或舒张压值。您需要为血压数据创建一个 HKCorrelationQuery，然后对于每个相关性，您需要进行一些挖掘以最终获得血压值。希望这对您有所帮助!

- (void)readBloodPressure {

HKQuantityType *systolicType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierBloodPressureSystolic];
HKQuantityType *diastolicType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierBloodPressureDiastolic];
HKCorrelationType *bloodPressureType =
[HKCorrelationType correlationTypeForIdentifier:HKCorrelationTypeIdentifierBloodPressure];

HKCorrelationQuery *query =
[[HKCorrelationQuery alloc]
 initWithType:bloodPressureType predicate:nil
 samplePredicates:nil
 completion:^(HKCorrelationQuery *query, NSArray *correlations, NSError *error) {
     if (correlations == nil) {
         // Provide proper error handling here...
         NSLog(@"An error occurred while searching for blood pressure data %@",
               error.localizedDescription);
         abort();
     }
     for (HKCorrelation *correlation in correlations) {
          HKQuantitySample *systolicSample = [[correlation objectsForType:systolicType] anyObject];
         HKQuantity *systolicQuantity = [systolicSample quantity];
         HKQuantitySample *diastolicSample = [[correlation objectsForType:diastolicType] anyObject];
         HKQuantity *diastolicQuantity = [diastolicSample quantity];
         double systolicd = [systolicQuantity doubleValueForUnit:[HKUnit millimeterOfMercuryUnit]];
         double diastolicd = [diastolicQuantity doubleValueForUnit:[HKUnit millimeterOfMercuryUnit]];
         NSLog(@"Systolic %f",systolicd);
         NSLog(@"Diastolic %f",diastolicd);
         NSLog(@"Date %@",systolicSample.startDate);

         [self saveBloodPressureIntoApp:systolicd withDiastolic:diastolicd withDate:systolicSample.startDate];


     }

 }];

[self.healthStore executeQuery:query];

}