如何从HealthKit中获取历史步长数据

import HealthKit

// 检查是否支持HealthKit
guard HKHealthStore.isHealthDataAvailable() else {
    print("HealthKit不可用")
    return
}

// 创建HKHealthStore实例
let healthStore = HKHealthStore()

// 准备数据类型
let stepCountType = HKQuantityType.quantityType(forIdentifier: .stepCount)

// 请求访问权限
healthStore.requestAuthorization(toShare: nil, read: [stepCountType!]) { (success, error) in
    guard success else {
        if let error = error {
            print("请求访问权限失败：\(error.localizedDescription)")
        }
        return
    }

    // 创建查询
    let query = HKSampleQuery(sampleType: stepCountType!,
                              predicate: nil,
                              limit: HKObjectQueryNoLimit,
                              sortDescriptors: nil) { (query, results, error) in
        guard let samples = results as? [HKQuantitySample], error == nil else {
            if let error = error {
                print("查询步长数据失败：\(error.localizedDescription)")
            }
            return
        }

        // 解析步长数据
        for sample in samples {
            let stepCount = sample.quantity.doubleValue(for: HKUnit.count())
            let startDate = sample.startDate
            let endDate = sample.endDate

            print("步数：\(stepCount)  开始时间：\(startDate)  结束时间：\(endDate)")
        }
    }

    // 执行查询
    healthStore.execute(query)
}