获取每天记录的总步数的最佳方法是什么HealthKit
。
通过 HKSampleQuery 的方法 initWithSampleType (见下文),我可以使用以下命令设置查询的开始和结束日期NSPredicate
,但该方法每天返回一个包含许多 HKQuantitySample 的数组。
- (instancetype)initWithSampleType:(HKSampleType *)sampleType
predicate:(NSPredicate *)predicate
limit:(NSUInteger)limit
sortDescriptors:(NSArray *)sortDescriptors
resultsHandler:(void (^)(HKSampleQuery *query,
NSArray *results,
NSError *error))resultsHandler
我想我可以查询所有记录的步数并遍历数组并计算每天的总步数,但我希望有一个更简单的解决方案,因为将有数千个 HKSampleQuery 对象。有没有办法让 initWithSampleType 返回每天的总步数?
你应该使用香港统计资料查询 https://developer.apple.com/library/prerelease/ios/documentation/HealthKit/Reference/HKStatisticsCollectionQuery_Class/index.html:
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *interval = [[NSDateComponents alloc] init];
interval.day = 1;
NSDateComponents *anchorComponents = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
fromDate:[NSDate date]];
anchorComponents.hour = 0;
NSDate *anchorDate = [calendar dateFromComponents:anchorComponents];
HKQuantityType *quantityType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];
// Create the query
HKStatisticsCollectionQuery *query = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:quantityType
quantitySamplePredicate:nil
options:HKStatisticsOptionCumulativeSum
anchorDate:anchorDate
intervalComponents:interval];
// Set the results handler
query.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection *results, NSError *error) {
if (error) {
// Perform proper error handling here
NSLog(@"*** An error occurred while calculating the statistics: %@ ***",error.localizedDescription);
}
NSDate *endDate = [NSDate date];
NSDate *startDate = [calendar dateByAddingUnit:NSCalendarUnitDay
value:-7
toDate:endDate
options:0];
// Plot the daily step counts over the past 7 days
[results enumerateStatisticsFromDate:startDate
toDate:endDate
withBlock:^(HKStatistics *result, BOOL *stop) {
HKQuantity *quantity = result.sumQuantity;
if (quantity) {
NSDate *date = result.startDate;
double value = [quantity doubleValueForUnit:[HKUnit countUnit]];
NSLog(@"%@: %f", date, value);
}
}];
};
[self.healthStore executeQuery:query];
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