使用Swift从HealthKit读取日期间隔的步骤

import HealthKit

let healthStore = HKHealthStore()

func requestAuthorization() {
    let stepType = HKObjectType.quantityType(forIdentifier: .stepCount)!
    healthStore.requestAuthorization(toShare: nil, read: [stepType]) { (success, error) in
        if success {
            // 用户已授权访问步数数据
        } else {
            // 授权请求失败
        }
    }
}

func queryStepCount(startDate: Date, endDate: Date) {
    let stepType = HKObjectType.quantityType(forIdentifier: .stepCount)!
    let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
    let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierStartDate, ascending: true)
    let query = HKSampleQuery(sampleType: stepType, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: [sortDescriptor]) { (query, results, error) in
        if let samples = results as? [HKQuantitySample] {
            for sample in samples {
                let stepCount = sample.quantity.doubleValue(for: HKUnit.count())
                let date = sample.startDate
                // 处理步数数据
            }
        } else {
            // 查询步数数据失败
        }
    }
    healthStore.execute(query)
}

func handleStepCount(stepCount: Double, date: Date) {
    // 处理步数数据
}