ios - iOS HealthKit今天的步数始终为0(但可以连续几天)

在我们的应用程序中，我们查询HealthKit以获取连续7天的步骤计数，每天汇总一次，以午夜为中心。因此范围是D-6午夜到明天的午夜(因为我们想要今天的步骤直到现在)。

是这样吗，我们始终能够获取过去6天的数据，但今天的数据始终为0。

但是奇怪的是，如果我们随后打开iOS 8.0附带的默认iHealth应用程序，它将计算运行状况数据并在图表中显示今天的步骤。然后，如果我们重新打开应用程序并重新加载图表数据，那么今天的步骤简直就是奇迹般的，与“iHealth”显示的内容相匹配。

那么，iPhone是否仅在午夜自动生成每日步数并对其进行缓存？在检索任何健康指标之前，我们是否需要单独打电话以计算今天的数据或其他数据？

这是我们用来获取数据的函数:

func queryDailyStats(metric: NSString!, handler: ([NSDate: Int] -> Void)!) {
    let quantityType = HKObjectType.quantityTypeForIdentifier(metric)
    let calendar = NSCalendar.currentCalendar()
    let now = NSDate()
    let preservedComponents: NSCalendarUnit = (.CalendarUnitYear | .CalendarUnitMonth | .CalendarUnitDay)
    let midnight: NSDate! = calendar.dateFromComponents(calendar.components(preservedComponents, fromDate:now))
    let dailyInterval = NSDateComponents()
    dailyInterval.day = 1

    let tomorrow = calendar.dateByAddingUnit(.MonthCalendarUnit, value: 1, toDate: midnight, options: nil)
    let oneMonthAgo = calendar.dateByAddingUnit(.MonthCalendarUnit, value: -1, toDate: midnight, options: nil)
    let oneWeekAgo = calendar.dateByAddingUnit(.DayCalendarUnit, value: -6, toDate: midnight, options: nil) // only need to start from 6 days back

    // need tomorrow's midnight as end date to get all of today's data
    let predicate = HKQuery.predicateForSamplesWithStartDate(oneWeekAgo, endDate: tomorrow, options: .None)

    let query = HKStatisticsCollectionQuery(
        quantityType: quantityType,
        quantitySamplePredicate: predicate,
        options: .CumulativeSum,
        anchorDate: midnight,
        intervalComponents: dailyInterval
    )

    query.initialResultsHandler = { query, results, error -> Void in
        var data:[NSDate: Int] = [:]
        if error != nil {
            println(error)
        } else {
            results.enumerateStatisticsFromDate(oneWeekAgo, toDate: midnight) { statistics, stop in
                if let quantity = statistics.sumQuantity() {
                    let date = statistics.startDate
                    let value = Int(quantity.doubleValueForUnit(HKUnit.countUnit()))

                    data[date] = value
                }
            }
        }

        handler(data)
    }

    self.healthKitStore.executeQuery(query)
}

最佳答案

尝试使用此代码，您只需更改开始日期和结束日期即可。

 -(void) getQuantityResult
 {
NSInteger limit = 0;
NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:currentDate endDate:[[NSDate date]dateByAddingTimeInterval:60*60*24*3] options:HKQueryOptionStrictStartDate];

NSString *endKey =  HKSampleSortIdentifierEndDate;
NSSortDescriptor *endDate = [NSSortDescriptor sortDescriptorWithKey: endKey ascending: NO];

HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType[HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]
                                                       predicate: predicate
                                                           limit: limit
                                                 sortDescriptors: @[endDate]
                                                  resultsHandler:^(HKSampleQuery *query, NSArray* results, NSError *error){
                                                        dispatch_async(dispatch_get_main_queue(), ^{
                                                          // sends the data using HTTP
                                                          int dailyAVG = 0;
                                                          for(HKQuantitySample *samples in results)
                                                                       {
                                                              dailyAVG += [[samples quantity] doubleValueForUnit:[HKUnit countUnit]];
                                                           }
                                                          lblPrint.text = [NSString stringWithFormat:@"%d",dailyAVG];
                                                          NSLog(@"%@",lblPrint.text);
                                                          NSLog(@"%@",@"Done");
                                                      });
                                                  }];
[self.healthStore executeQuery:query];

}

关于ios - iOS HealthKit今天的步数始终为0(但可以连续几天)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29708829/