iOS query the step count

gistfile1.m

// Set your start and end date for your query of interest
NSDate *startDate, *endDate;

// Use the sample type for step count
HKSampleType *sampleType = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];

// Create a predicate to set start/end date bounds of the query
NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:startDate endDate:endDate options:HKQueryOptionStrictStartDate];

// Create a sort descriptor for sorting by start date
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:HKSampleSortIdentifierStartDate ascending:YES];


HKSampleQuery *sampleQuery = [[HKSampleQuery alloc] initWithSampleType:sampleType
                                                             predicate:predicate
                                                                 limit:HKObjectQueryNoLimit
                                                       sortDescriptors:@[sortDescriptor]
                                                         resultsHandler:^(HKSampleQuery *query, NSArray *results, NSError *error) {
                                                            
                                                             if(!error && results)
                                                             {
                                                                 for(HKQuantitySample *samples in results)
                                                                 {
                                                                     // your code here
                                                                 }
                                                             }
                                                             
                                                         }];

// Execute the query
[healthStore executeQuery:sampleQuery];