Apple Watch 上的心率数据

Question

我们可以直接从 Apple Watch 获取心率吗？我知道这是一个重复的问题，但在 5 个月内没有人问过这个问题。我知道您可以从健康应用程序访问它，但我不确定 "real-time" 会怎样。

Answer 1

无法直接访问 Apple Watch 上的任何传感器。您将不得不依赖 HealthKit 的访问权限。

苹果传道者这样说

It is not possible to create a heart monitor app at this time. The data isn't guaranteed to be sent to iPhone in real-time, so you won't be able to determine what's going on in any timely fashion.

见https://devforums.apple.com/message/1098855#1098855

Answer 2

心率原始数据信息 现已在 Watchkit for watchOS 2.0 中可用。

WatchOS 2 包括对其他现有框架的许多增强，例如 HealthKit，允许访问实时访问心率和健康信息的健康传感器。

你可以在后面的session里查看这个信息，总共30分钟presentation.If你不想看整个session，那么你直接跳到Healthkit API features，它在25- 28 分钟：

WatchKit for watchOS 2.0 Session in WWDC 2015

这里是源码实现link

如 HKWorkout Class Reference 中所述：

The HKWorkout class is a concrete subclass of the HKSample class. HealthKit uses workouts to track a wide range of activities. The workout object not only stores summary information about the activity (for example, duration, total distance, and total energy burned), it also acts as a container for other samples. You can associate any number of samples with a workout. In this way, you can add detailed information relevant to the workout.

在给定link的情况下，以下代码部分定义了heartRate

的采样率

NSMutableArray *samples = [NSMutableArray array];

HKQuantity *heartRateForInterval =
[HKQuantity quantityWithUnit:[HKUnit unitFromString:@"count/min"]
                 doubleValue:95.0];

HKQuantitySample *heartRateForIntervalSample =
[HKQuantitySample quantitySampleWithType:heartRateType
                                quantity:heartRateForInterval
                               startDate:intervals[0]
                                 endDate:intervals[1]];

[samples addObject:heartRateForIntervalSample];

正如他们所说：

You need to fine tune the exact length of your associated samples based on the type of workout and the needs of your app. Using 5 minute intervals minimizes the amount of memory needed to store the workout , while still providing a general sense of the change in intensity over the course of a long workout. Using 5 second intervals provides a much-more detailed view of the workout, but requires considerably more memory and processing.

Answer 3

在探索 HealthKit 和 WatchKit Extension 之后，我的发现如下：

1. 我们不需要 WatchKit 扩展来获取心率数据。

2. 您只需要 iPhone 与配对的 Apple Watch（这很明显）

3. 默认的 Apple Watch 心率监测应用仅在前台运行时才立即更新 HealthKit 数据。

4. 当默认的 Apple Watch 心率监测应用程序在后台运行时，它会以 9-10 分钟的间隔更新 HealthKit 数据。

5. 要从 HealthKit 获取心率数据，需要定期触发以下查询。

   func getSamples() {
   
       let heathStore = HKHealthStore()
   
       let heartrate = HKQuantityType.quantityType(forIdentifier: .heartRate)
       let sort: [NSSortDescriptor] = [
           .init(key: HKSampleSortIdentifierStartDate, ascending: false)
       ]
   
       let sampleQuery = HKSampleQuery(sampleType: heartrate!, predicate: nil, limit: 1, sortDescriptors: sort, resultsHandler: resultsHandler)
   
       heathStore.execute(sampleQuery)
   
   }
   
   func resultsHandler(query: HKSampleQuery, results: [HKSample]?, error: Error?) {
   
       guard error == nil else {
           print("cant read heartRate data", error!)
           return
       }
   
       guard let sample = results?.first as? HKQuantitySample else { return }
   
       // let heartRateUnit: HKUnit = .init(from: "count/min")
       // let doubleValue = sample.quantity.doubleValue(for: heartRateUnit)
   
       print("heart rate is", sample)
   }
   

如果有人得到更多信息，请更新我。
快乐编码。

更新

我已将您的代码更新为清晰和通用，请注意您需要获得授权才能读取 HeathKit 数据和添加 info.plist 密钥 Privacy - Health Records Usage Description

Answer 4

您可以通过开始运动获取心率数据，在healthkit中查询心率数据。

1. 请求阅读锻炼数据的权限。

   HKHealthStore *healthStore = [[HKHealthStore alloc] init];
   HKQuantityType *type = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate];
   HKQuantityType *type2 = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierDistanceWalkingRunning];
   HKQuantityType *type3 = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierActiveEnergyBurned];
   
   [healthStore requestAuthorizationToShareTypes:nil readTypes:[NSSet setWithObjects:type, type2, type3, nil] completion:^(BOOL success, NSError * _Nullable error) {
   
   if (success) {
       NSLog(@"health data request success");
   
   }else{
       NSLog(@"error %@", error);
   }
   }];
   

2. 在 iPhone 上的 AppDelegate 中，响应此请求

   -(void)applicationShouldRequestHealthAuthorization:(UIApplication *)application{
   
   [healthStore handleAuthorizationForExtensionWithCompletion:^(BOOL success, NSError * _Nullable error) {
           if (success) {
               NSLog(@"phone recieved health kit request");
           }
       }];
   }
   

3. 然后执行Healthkit Delegate:

   -(void)workoutSession:(HKWorkoutSession *)workoutSession didFailWithError:(NSError *)error{
   
   NSLog(@"session error %@", error);
   }
   
   -(void)workoutSession:(HKWorkoutSession *)workoutSession didChangeToState:(HKWorkoutSessionState)toState fromState:(HKWorkoutSessionState)fromState date:(NSDate *)date{
   
   dispatch_async(dispatch_get_main_queue(), ^{
       switch (toState) {
           case HKWorkoutSessionStateRunning:
   
               //When workout state is running, we will excute updateHeartbeat
               [self updateHeartbeat:date];
               NSLog(@"started workout");
           break;
   
           default:
           break;
       }
       });
   }
   

4. 该写了**[self updateHeartbeat:date]**

   -(void)updateHeartbeat:(NSDate *)startDate{
   
       //first, create a predicate and set the endDate and option to nil/none 
       NSPredicate *Predicate = [HKQuery predicateForSamplesWithStartDate:startDate endDate:nil options:HKQueryOptionNone];
   
       //Then we create a sample type which is HKQuantityTypeIdentifierHeartRate
       HKSampleType *object = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate];
   
       //ok, now, create a HKAnchoredObjectQuery with all the mess that we just created.
       heartQuery = [[HKAnchoredObjectQuery alloc] initWithType:object predicate:Predicate anchor:0 limit:0 resultsHandler:^(HKAnchoredObjectQuery *query, NSArray<HKSample *> *sampleObjects, NSArray<HKDeletedObject *> *deletedObjects, HKQueryAnchor *newAnchor, NSError *error) {
   
       if (!error && sampleObjects.count > 0) {
           HKQuantitySample *sample = (HKQuantitySample *)[sampleObjects objectAtIndex:0];
           HKQuantity *quantity = sample.quantity;
           NSLog(@"%f", [quantity doubleValueForUnit:[HKUnit unitFromString:@"count/min"]]);
       }else{
           NSLog(@"query %@", error);
       }
   
       }];
   
       //wait, it's not over yet, this is the update handler
       [heartQuery setUpdateHandler:^(HKAnchoredObjectQuery *query, NSArray<HKSample *> *SampleArray, NSArray<HKDeletedObject *> *deletedObjects, HKQueryAnchor *Anchor, NSError *error) {
   
        if (!error && SampleArray.count > 0) {
           HKQuantitySample *sample = (HKQuantitySample *)[SampleArray objectAtIndex:0];
           HKQuantity *quantity = sample.quantity;
           NSLog(@"%f", [quantity doubleValueForUnit:[HKUnit unitFromString:@"count/min"]]);
        }else{
           NSLog(@"query %@", error);
        }
   }];
   
       //now excute query and wait for the result showing up in the log. Yeah!
       [healthStore executeQuery:heartQuery];
   }
   

您还可以开启 Healthkit 的功能。如果您有任何问题，请在下方发表评论。