如何强制HKQuery加载最新的步骤计数？ [英] How to force a HKQuery to load the most recent steps counts?

问题描述

目前我正在尝试使用 HKStatisticsQuery 来获取特定时间间隔之间的步数。我自己正在通过摇动手机进行测试。但是，似乎我得到的结果不是最近的结果，除非：

Currently I'm trying to use HKStatisticsQuery to get the steps count between a certain time interval. I'm doing test by shaking the phone myself. However, it seems that the result I get is not the most recent one, unless:

1. 我打开健康.app ，让它在后台运行，然后在我的应用中再次进行测试;


2. 我打开 UP应用，让它在后台运行，然后在我的应用程序中再次进行测试。

1. I open the Health.app, keep it running in background, and do the test again in my app;
2. I open the UP app, keep it running in background, and do the test again in my app.

如果我强制退出 Health.app 或 UP app ，我的应用将无法再次获取最新数据。因此UP必须做一些我缺少的事情，但我找不到 HKHealthStore 中的任何重载方法，或者 HKQuery / HKStatisticsQuery 。

And if I force-quit the Health.app orUP app, my app will not be able to get the most recent data again. So UP must be doing something I'm missing, but I can't find there's any "reload" like method in HKHealthStore, or any related options in HKQuery/HKStatisticsQuery.

我正在使用的代码非常简单，如下所示。我想知道是否有任何权限或我遗漏的任何内容。

The code I'm using is quite straight forward as below. I wonder if there's any permissions or anything I'm missing.

    let predicate = HKQuery.predicateForSamplesWithStartDate(date_start, endDate: NSDate(), options: HKQueryOptions.StrictStartDate)
    var type = HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierDistanceWalkingRunning)
    var query = HKStatisticsQuery(quantityType: type,
        quantitySamplePredicate: predicate,
        options: .CumulativeSum | .SeparateBySource,
        completionHandler: { query, stats, error in ( /*logs here*/ ) })
    let healthStore = HKHealthStore()
    healthStore.executeQuery(query)

编辑：我还尝试将一些数据写入 HealthKit 但是查询没有得到更新。

I also tried to write some data to HealthKit but the query doesn't get updated.

Edit2：当我说最近的步骤计数时，我的意思是：1。执行HKQuery;摇动手机; 3.再次执行HKQuery。运行上面的代码2次，我总是得到相同的结果，但如果我在后台离开Health.app或 UP 应用程序，最新的查询得到了更新的结果。

when I said "most recent steps counts" I meant something like: 1. execute HKQuery; 2. shake phone; 3. execute HKQuery again. Running the code above for 2 times and I always get the same results, but if I left Health.app or the UP app in the background, the latest query got the updated results.

我还尝试调用其他一些API，如：

I also tried to call some other APIs like:

    healthStore.enableBackgroundDeliveryForType(type, frequency:.Immediate, withCompletion:{
        (success:Bool, error:NSError!) -> Void in
        let authorized = healthStore.authorizationStatusForType(type)
        LF.log("HEALTH callback success", success)
        LF.log("HEALTH callback authorized", type)
    })

    if HKHealthStore.isHealthDataAvailable() == false {
        LF.log("HEALTH data not available")
        return
    } else {
        LF.log("HEALTH OK")
    }

几乎没有理由但是试图暗中触发某种背景刷新。但这些尝试都没有奏效。

For almost no reason but try to secretly "trigger" some sort of background refresh. But none of these attempts worked.

推荐答案

HealthKit并不总是有最新的用户步数和距离计数旅行。它会定期导入这些值，这些值实际上来自CoreMotion.framework，并响应某些事件。如果正在运行的应用程序具有打开的 HKObserverQuery 或 HKStatisticsCollectionQuery ，那么HealthKit会将值传输到客户端，否则样本将是只是上次导入的快照。

HealthKit does not always have an up-to-date count of the user's steps and distance travelled. It imports these values, which actually come from CoreMotion.framework, periodically and in response to certain events. If a running application has an open HKObserverQuery or HKStatisticsCollectionQuery then HealthKit will stream the values to the client but otherwise the samples are just a snapshot from the last import.

因此，如果您想观察样本类型的更改，您应该使用 HKObserverQuery 订阅更新然后再次查询HealthKit以获取最新值。但更有效的方法是使用 HKStatisticsCollectionQuery ，它有一个更新处理程序，将作为匹配谓词的样本的统计信息进行调用。

So if you'd like to observe changes for a sample type, you should subscribe to updates using an HKObserverQuery and then query HealthKit again for the latest values. A more efficient approach would be to use HKStatisticsCollectionQuery, though, which has an update handler that will be invoked as the statistics for the samples matching the predicates change.

最后，如果您只对最近7天的最新步数或最近行程感兴趣，那么我建议您考虑直接使用CoreMotion.framework。

Finally, if you're only interested up-to-date step counts or distance travelled for at most the past 7 days then I recommend that you consider using CoreMotion.framework directly instead.

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