Get total step count for every date in HealthKit

Question

What\'s the best way to get a total step count for every day recorded in HealthKit. With HKSampleQuery\'s method initWithSampleType (see below) I can set a star

Answer 1

I wrapped mine in a completion block (objective -c). I found what was best was to set the startDate for the query to todays date at midnight. Hope this helps, feel free to copy/paste to get started

-(void)fetchHourlyStepsWithCompletionHandler:(void (^)(NSMutableArray *, NSError *))completionHandler {
     NSMutableArray *mutArray = [NSMutableArray new];
     NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];

     NSDate *startDate = [calendar dateBySettingHour:0 minute:0 second:0 ofDate:[NSDate date] options:0];

     NSDate *endDate = [NSDate date]; // Whatever you need in your case
     HKQuantityType *type = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];

    // Your interval: sum by hour
     NSDateComponents *intervalComponents = [[NSDateComponents alloc] init];
     intervalComponents.hour = 1;

   // Example predicate
     NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:startDate endDate:endDate options:HKQueryOptionStrictStartDate];

     HKStatisticsCollectionQuery *query = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:type quantitySamplePredicate:predicate options:HKStatisticsOptionCumulativeSum anchorDate:startDate intervalComponents:intervalComponents];
query.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection *results, NSError *error) {
    [results enumerateStatisticsFromDate:startDate toDate:endDate
     withBlock:^(HKStatistics *result, BOOL *stop) {
         if (!result) {
             if (completionHandler) {
                 completionHandler(nil, error);
             }
             return;
         }
         
         HKQuantity *quantity = result.sumQuantity;
         
         NSDate *startDate = result.startDate;
       
         NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
         formatter.dateFormat = @"h a";
        
         NSString *dateString = [formatter stringFromDate:startDate]; 
         
         double steps = [quantity doubleValueForUnit:[HKUnit countUnit]];
         
         NSDictionary *dict = @{@"steps" : @(steps),
                                @"hour" : dateString
                                };
         
         [mutArray addObject:dict];
     }];
    
    if (completionHandler) {
        completionHandler(mutArray, error);
    }
};
    [self.healthStore executeQuery:query];
}