苹果健康initHeartBeatSeries，如何获取HKHeartbeatSeriesSample？

import HealthKit

// 检查设备是否支持HealthKit
guard HKHealthStore.isHealthDataAvailable() else {
    print("设备不支持HealthKit")
    return
}

// 创建HealthKit数据存储对象
let healthStore = HKHealthStore()

// 请求访问权限
let heartRateType = HKObjectType.quantityType(forIdentifier: .heartRate)!
healthStore.requestAuthorization(toShare: nil, read: [heartRateType]) { (success, error) in
    guard success else {
        print("无法获取访问权限：\(error?.localizedDescription ?? "")")
        return
    }
    
    // 创建查询对象
    let sampleType = HKObjectType.quantityType(forIdentifier: .heartRate)!
    let predicate = HKQuery.predicateForSamples(withStart: Date.distantPast, end: Date(), options: .strictStartDate)
    let query = HKSampleQuery(sampleType: sampleType, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: nil) { (query, results, error) in
        guard let samples = results as? [HKQuantitySample], error == nil else {
            print("查询心率数据失败：\(error?.localizedDescription ?? "")")
            return
        }
        
        // 遍历查询结果
        for sample in samples {
            let heartRate = sample.quantity.doubleValue(for: HKUnit(from: "count/min"))
            let timestamp = sample.startDate
            
            // 处理心率数据
            print("心率：\(heartRate)，时间：\(timestamp)")
        }
    }
    
    // 执行查询
    healthStore.execute(query)
}