使用swift从Health kit获取今天的所有步骤，但手动截断添加的步骤

import HealthKit

let healthStore = HKHealthStore()
let stepType = HKObjectType.quantityType(forIdentifier: .stepCount)!

healthStore.requestAuthorization(toShare: nil, read: [stepType]) { (success, error) in
    if success {
        // 用户已授权，可以获取步数数据
    } else {
        // 授权请求失败，处理错误
    }
}

let stepType = HKObjectType.quantityType(forIdentifier: .stepCount)!
let calendar = Calendar.current
let now = Date()
let startOfDay = calendar.startOfDay(for: now)
let predicate = HKQuery.predicateForSamples(withStart: startOfDay, end: now, options: .strictStartDate)

let query = HKStatisticsQuery(quantityType: stepType, quantitySamplePredicate: predicate, options: .cumulativeSum) { (query, result, error) in
    if let result = result, let sum = result.sumQuantity() {
        let steps = sum.doubleValue(for: HKUnit.count())
        print("今天的步数：\(steps)")
    } else {
        // 查询步数数据失败，处理错误
    }
}

healthStore.execute(query)