获取以HealthKit为单位记录的每一天的总步数的最佳方法是什么？使用 HKSampleQuery 的方法 initWithSampleType（见下文），我可以使用 NSPredicate 设置查询的开始和结束日期，但该方法返回一个数组，每天包含许多 HKQuantitySamples。
- (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骤计数并浏览数组并计算每天的总步骤计数，但我希望有一个更简单的解决方案，因为会有数千个 HKSampleQuery 对象。有没有办法让 initWithSampleType 每天返回总步数？
你应该使用 HKStatisticsCollectionQuery：
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];
移植
到 Swift，不依赖于 SwiftDate 库
let calendar = NSCalendar.current
let interval = NSDateComponents()
interval.day = 1
var anchorComponents = calendar.dateComponents([.day, .month, .year], from: NSDate() as Date)
anchorComponents.hour = 0
let anchorDate = calendar.date(from: anchorComponents)
// Define 1-day intervals starting from 0:00
let stepsQuery = HKStatisticsCollectionQuery(quantityType: stepsCount!, quantitySamplePredicate: nil, options: .cumulativeSum, anchorDate: anchorDate!, intervalComponents: interval as DateComponents)
// Set the results handler
stepsQuery.initialResultsHandler = {query, results, error in
let endDate = NSDate()
let startDate = calendar.date(byAdding: .day, value: -7, to: endDate as Date, wrappingComponents: false)
if let myResults = results{
myResults.enumerateStatistics(from: startDate!, to: endDate as Date) { statistics, stop in
if let quantity = statistics.sumQuantity(){
let date = statistics.startDate
let steps = quantity.doubleValue(for: HKUnit.count())
print("(date): steps = (steps)")
//NOTE: If you are going to update the UI do it in the main thread
DispatchQueue.main.async {
//update UI components
}
}
} //end block
} //end if let
}
healthStore?.execute(stepsQuery)
使用核心 Swift 类修改了 @sebastianr 的答案，仅用于测试 我只返回一天的步骤，一旦你有更多的天数，你可以创建一个日期和步数字典并返回它
func getStepCountPerDay(completion:@escaping (_ count: Double)-> Void){
guard let sampleType = HKObjectType.quantityType(forIdentifier: .stepCount)
else {
return
}
let calendar = Calendar.current
var dateComponents = DateComponents()
dateComponents.day = 1
var anchorComponents = calendar.dateComponents([.day, .month, .year], from: Date())
anchorComponents.hour = 0
let anchorDate = calendar.date(from: anchorComponents)
let stepsCumulativeQuery = HKStatisticsCollectionQuery(quantityType: sampleType, quantitySamplePredicate: nil, options: .cumulativeSum, anchorDate: anchorDate!, intervalComponents: dateComponents
)
// Set the results handler
stepsCumulativeQuery.initialResultsHandler = {query, results, error in
let endDate = Date()
let startDate = calendar.date(byAdding: .day, value: 0, to: endDate, wrappingComponents: false)
if let myResults = results{
myResults.enumerateStatistics(from: startDate!, to: endDate as Date) { statistics, stop in
if let quantity = statistics.sumQuantity(){
let date = statistics.startDate
let steps = quantity.doubleValue(for: HKUnit.count())
print("(date): steps = (steps)")
completion(steps)
//NOTE: If you are going to update the UI do it in the main thread
DispatchQueue.main.async {
//update UI components
}
}
} //end block
} //end if let
}
HKHealthStore().execute(stepsCumulativeQuery)
}
下面是一个目前适用于 Swift 2.0 的翻译，使用 SwiftDate 库。
let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
let startDate = NSDate().beginningOfDay().oneWeekAgo()
let interval = NSDateComponents()
interval.day = 1
let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: NSDate(), options: .StrictStartDate)
let query = HKStatisticsCollectionQuery(quantityType: type!, quantitySamplePredicate: predicate, options: [.CumulativeSum], anchorDate: NSDate().begginingOfDay(), intervalComponents:interval)
query.initialResultsHandler = { query, results, error in
let endDate = NSDate()
let startDate = NSDate().beginningOfDay().oneWeekAgo()
if let myResults = results{
myResults.enumerateStatisticsFromDate(startDate, toDate: endDate) {
statistics, stop in
if let quantity = statistics.sumQuantity() {
let date = statistics.startDate
let steps = quantity.doubleValueForUnit(HKUnit.countUnit())
print("(date): steps = (steps)")
}
}
}
}
healthKitStore.executeQuery(query)
我把我的包裹在一个完成块中（目标 -c）。我发现最好的方法是将查询的开始日期设置为午夜的今天日期。希望这有帮助，请随时复制/粘贴以开始使用
-(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];
}
更新了 Swift 2.0 和 SwiftDate 库。
let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
let startDate = NSDate().beginningOfDay
let interval = NSDateComponents()
interval.day = 1
let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: NSDate(), options: .StrictStartDate)
let query = HKStatisticsCollectionQuery(quantityType: type!, quantitySamplePredicate: predicate, options: [.CumulativeSum], anchorDate: NSDate().beginningOfDay, intervalComponents:interval)
query.initialResultsHandler = { query, results, error in
let endDate = NSDate()
let startDate = NSDate().beginningOfDay
if let myResults = results{
myResults.enumerateStatisticsFromDate(startDate, toDate: endDate) {
statistics, stop in
if let quantity = statistics.sumQuantity() {
let date = statistics.startDate
let steps = quantity.doubleValueForUnit(HKUnit.countUnit())
print("(date): steps = (steps)")
}
}
}
}
healthKitStore.executeQuery(query)