心电图期间无法获取用户的平均心率

Posted 2023-03-10

【中文标题】心电图期间无法获取用户的平均心率

【英文标题】：Cant get user’s average heart rate during the ECG

【发布时间】：2021-09-23 09:42:25

【问题描述】：

我按照 Apple Doc 的示例代码成功获取心电图。现在我想获得心电图期间用户的平均心率。我有以下代码：

var ecgSamples = [(Double,Double)] ()
let predicate = HKQuery.predicateForSamples(withStart: Date.distantPast,end: Date.distantFuture,options: .strictEndDate)
let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierStartDate, ascending: false)

let ecgQuery = HKSampleQuery(sampleType: HKObjectType.electrocardiogramType(), predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: [sortDescriptor]) (query, samples, error) in
    
    guard let samples = samples else 
        return
    
    let query = HKElectrocardiogramQuery(samples[counter] as! HKElectrocardiogram)  (query, result) in
        
        switch result 
        case .error(let error):
            print("error: ", error)
        case .measurement(let value):
            let sample = (value.quantity(for: .appleWatchSimilarToLeadI)!.doubleValue(for: HKUnit.volt()) , value.timeSinceSampleStart)
            print(sample)
            ecgSamples.append(sample)
        case .done:
            print("done")
            DispatchQueue.main.async 
                completion(ecgSamples,samples[counter].startDate)
            
        
    

    self.healthStore.execute(query)

self.healthStore.execute(ecgQuery)

我不明白如何选择平均心率？

【参考方案1】：

你可以从HKElectrocardiogram对象获取它：

let electrocardiogram = samples[counter] as! HKElectrocardiogram
let averageHeartRate = electrocardiogram.averageHeartRate?.doubleValue(for: HKUnit.count().unitDivided(by: .minute())) ?? 0