如何仅查询 HealthKit 以获取给定日期的总“在床上”时间？答案

【问题标题】：How to only query HealthKit for Total "In Bed" time for a given day?如何仅查询 HealthKit 以获取给定日期的总“在床上”时间？
【发布时间】：2020-12-23 00:10:47
【问题描述】：

互联网上没有用于查询睡眠数据的完整示例代码。下面的代码将返回给定日期的所有睡眠样本，如果您查看 Apple Health App，其中包括来自 Apple Watch 的“睡眠”样本，它们是睡眠间隔，但也有来自 iPhone 的“床上”样本，其中包含从上床到下床的总范围。如何仅查询 HealthKit 中的这个 In Bed 样本？

func sleepTime() {
        let healthStore = HKHealthStore()
        // startDate and endDate are NSDate objects
        // first, we define the object type we want
        if let sleepType = HKObjectType.categoryType(forIdentifier: HKCategoryTypeIdentifier.sleepAnalysis) {
            // You may want to use a predicate to filter the data... startDate and endDate are NSDate objects corresponding to the time range that you want to retrieve
            //let predicate = HKQuery.predicateForSamplesWithStartDate(startDate,endDate: endDate ,options: .None)
            // Get the recent data first
            let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)
            // the block completion to execute
            let query = HKSampleQuery(sampleType: sleepType, predicate: nil, limit: 100000, sortDescriptors: [sortDescriptor]) { (query, tmpResult, error) -> Void in
                if error != nil {
                    // Handle the error in your app gracefully
                    return
                }
                if let result = tmpResult {
                   for item in result {
                        if let sample = item as? HKCategorySample {
                               let startDate = sample.startDate
                               let endDate = sample.endDate
                               print()
                             let sleepTimeForOneDay = sample.endDate.timeIntervalSince(sample.startDate)
                        }
                    }
                }
          }
    }

【问题讨论】：

标签： ios swift healthkit

【解决方案1】：

HKCategorySample 包含 Int 类型的 value，它是样本的枚举值。它具有三个值：

0 -> 在床上

1 -> 睡着了

2 -> 清醒

因此，如果您只需要 inBed 数据，建议的更改是：

if let result = tmpResult {
                for item in result {
                    if let sample = item as? HKCategorySample {
                        if sample.value == 0 {
                            let startDate = sample.startDate
                            let endDate = sample.endDate
                            print()
                            let sleepTimeForOneDay = sample.endDate.timeIntervalSince(sample.startDate)
                            
                        }
                    }
                }
            }

更好的方法是使用 switch 案例。

if let result = tmpResult {
                for item in result {
                    if let sample = item as? HKCategorySample {
                        switch sample.value {
                        case 0:
                            // inBed, write logic here
                            print("inBed")
                        case 1:
                            // asleep, write logic here
                            print("asleep")
                        default:
                            // awake, write logic here
                            print("awake")
                        }
                    }
                }
            }

【讨论】：