苹果healthKit快速眼动，深度，轻度睡眠分析

Question

我正在开发一个IOS睡眠应用程序，在那里我需要做睡眠分析。我正在使用Healthkit来获取睡眠数据，在那里我可以使用以下代码成功地获取睡眠分析数据：

func retrieveSleepAnalysis(from startDate: Date?, to endDate: Date? , completion: @escaping ([HKCategorySample], Error?) -> Void) {
guard let sleepType = HKObjectType.categoryType(forIdentifier: .sleepAnalysis) else { return}
        let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
        let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)
        let query = HKSampleQuery(sampleType: sleepType, predicate: predicate, limit: 10000, sortDescriptors: [sortDescriptor]) { (query, result, error) in
            if error != nil {
                completion([], error)
                return
            }
            if let result = result {
                let samples = result.compactMap({ $0 as? HKCategorySample})
                completion(samples, nil)
            }
        }
        // finally, we execute our query
        HKHealthStore().execute(query)
    }

我无法找到任何用于睡眠快速眼动周期、深度睡眠、轻度睡眠等的healthKit代码，甚至可以从healthKit获得这些数据吗？如果是，怎么做?如果不是用healthKit，如何在IOS应用程序中做到这一点？

Answer 1

你可能会在今年的"HealthKit的新特点是什么？“论坛上找到你想要的东西

下面是如何为所有示例声明谓词：

// Predicate for all asleep samples (unspecified, core, deep, REM)
let allAsleepPredicate = HKCategoryValueSleepAnalysis.predicateForSamples(equalTo: .allAsleepValues)

下面是如何使用它获取范围内的所有样本：

let healthStore = HKHealthStore()
let sleepType = HKCategoryType(.sleepAnalysis)

let dateRangePredicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
let predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [dateRangePredicate, allAsleepPredicate])

let query = HKSampleQuery(sampleType: sleepType, predicate: predicate) { (query, result, error) in
    // handle results
}

希望这有帮助