ios - HKSampleQuery 即使有
<p><p>我正在尝试获取过去一个月的所有心率样本，并从中提取时间和值。</p>
<p>到目前为止，我有以下方法:</p>
<pre><code>func getThisMonthsHeartRates() {
print("func called")
let heartRateUnit:HKUnit = HKUnit(from: "count/min")
let heartRateType:HKQuantityType = HKQuantityType.quantityType(forIdentifier: .heartRate)!
//predicate
let startDate = Date()
let endDate = Date() - 1.month
let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: [])
//descriptor
let sortDescriptors = [
NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)
]
let heartRateQuery = HKSampleQuery(sampleType: heartRateType,
predicate: predicate,
limit: Int(HKObjectQueryNoLimit),
sortDescriptors: sortDescriptors)
{ (query:HKSampleQuery, results:?, error:Error?) -> Void in
guard error == nil else { print("error"); return }
print("results")
print(results!)
for result in results! {
guard let currData:HKQuantitySample = result as? HKQuantitySample else { return }
print("Heart Rate: \(currData.quantity.doubleValue(for: heartRateUnit))")
print("quantityType: \(currData.quantityType)")
print("Start Date: \(currData.startDate)")
print("End Date: \(currData.endDate)")
print("Metadata: \(String(describing: currData.metadata))")
print("UUID: \(currData.uuid)")
print("Source: \(currData.sourceRevision)")
print("Device: \(String(describing: currData.device))")
print("---------------------------------\n")
}
}//eo-query
healthStore.execute(heartRateQuery)
}//eom
</code></pre>
<p>但是，结果将始终返回一个空数组，即使我的设备上有样本!真的很好奇这是怎么回事以及如何解决它。我完全不知所措。</p>
<p>谢谢</p>
<p><strong>更新</strong></p>
<p>在查询执行前和执行期间记录查询后，控制台会这样说:</p>
<pre><code><HKSampleQuery:0x1c4117610 inactive>
</code></pre>
<p>还有</p>
<pre><code><HKSampleQuery:0x1c4117610 deactivated>
</code></pre>
<p>我不知道这意味着什么，我也无法在网上找到任何关于它的信息。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>问题可能是您已请求授权以编写 <code>.heartRate</code> 样本类型，但未同时读取它们。在这种情况下，您在执行查询时不会收到错误，但是 samples 数组将为空。</p>
<p>我遇到了同样的问题，因为我是这样请求授权的:</p>
<pre><code>healthStore.requestAuthorization(toShare: types, read: nil) {}
</code></pre>
<p>相反，您需要指定要读取的类型，即使它们已经在 <code>types</code> 集中。</p></p>
<p style="font-size: 20px;">关于ios - HKSampleQuery 即使有，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/49729905/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/49729905/
</a>
</p>
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