创建复合谓词以从HealthKit iOS iPhone获取具有条件的数据

Question

我正在尝试使用复合谓词从iOS HealthKit获取HeartRate数据。但似乎没有提供任何数据。

这是以下谓词代码

let predicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.and, subpredicates: [HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictEndDate), HKQuery.predicateForObjects(withDeviceProperty: HKMetadataKeyHeartRateMotionContext, allowedValues: ["1"])])

var interval = DateComponents()
        interval.day = 1
        let query = HKStatisticsCollectionQuery(quantityType: type, quantitySamplePredicate: predicate, options: [.discreteAverage], anchorDate: startDate, intervalComponents:interval)
        query.initialResultsHandler = { query, results, error in
            if error != nil {

                return
            }
            DispatchQueue.main.async {
                completionHandler(results)
            }

        }

        HKSingleton.sharedInstance.healthStore.execute(query)

  

HKMetadataKeyHeartRateMotionContext 是测量心率样本时用户的活动水平。

如果我在此代码中做错了什么，请纠正我。

预先感谢