如何获取之前日期的HealthKit总步数

import HealthKit

let healthStore = HKHealthStore()

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

// 请求步数数据的授权
let stepType = HKQuantityType.quantityType(forIdentifier: .stepCount)!
healthStore.requestAuthorization(toShare: nil, read: [stepType]) { (success, error) in
    if let error = error {
        print("授权请求失败：\(error.localizedDescription)")
        return
    }
    
    if success {
        // 授权成功，可以获取步数数据
        // 在这里执行获取步数数据的代码
    } else {
        print("用户未授权访问步数数据")
    }
}

// 定义查询的日期范围
let calendar = Calendar.current
let endDate = Date()
let startDate = calendar.date(byAdding: .day, value: -7, to: endDate)!

// 创建步数数据查询
let stepType = HKQuantityType.quantityType(forIdentifier: .stepCount)!
let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
let query = HKStatisticsCollectionQuery(quantityType: stepType, quantitySamplePredicate: predicate, options: .cumulativeSum, anchorDate: startDate, intervalComponents: DateComponents(day: 1))

// 设置查询结果的处理
query.initialResultsHandler = { query, results, error in
    guard let results = results else {
        print("查询步数数据失败：\(error?.localizedDescription ?? "未知错误")")
        return
    }
    
    // 遍历查询结果
    results.enumerateStatistics(from: startDate, to: endDate) { statistics, stop in
        if let quantity = statistics.sumQuantity() {
            let date = statistics.startDate
            let steps = quantity.doubleValue(for: HKUnit.count())
            
            // 在这里处理每天的步数数据
            print("日期：\(date)，步数：\(steps)")
        }
    }
}

// 执行查询
healthStore.execute(query)