HKAnchoredQuery更新处理程序无法正常工作

我写了一个代码来从Health kit获取心率值。 该代码工作正常，但是当新的心脏值在Health kit中更新时。 我必须来到主屏幕，然后多任务我的应用程序来获取更新的结果。 我的目标是在没有重新开放或多任务处理的情况下获取应用程序的更新结果，请帮助我，因为我是iOS开发新手。 我的代码： –

-(void)get_heartRates { //code to get the updated heart beats HKSampleType *sampleType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate]; HKObserverQuery *query = [[HKObserverQuery alloc] initWithSampleType:sampleType predicate:nil updateHandler:^(HKObserverQuery *query, HKObserverQueryCompletionHandler completionHandler, NSError *error) { if (error) { NSLog(@"error occured while setting observer. %@ ", error.localizedDescription); abort(); } // Take whatever steps are necessary to update your app's data and UI // This may involve executing other queries [self executeAnchoredQuery]; // If you have subscribed for background updates you must call the completion handler here. // completionHandler(); }]; [self.healthStore executeQuery:query]; } -(void)executeAnchoredQuery { NSDate *startDate1 = [NSDate distantPast]; NSPredicate *Predicate = [HKQuery predicateForSamplesWithStartDate:startDate1 endDate:[NSDate date] options:HKQueryOptionStrictEndDate]; HKSampleType *object = [HKSampleType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate]; sum_Of_HeartRates=0.0; HKAnchoredObjectQuery *heartQuery = [[HKAnchoredObjectQuery alloc] initWithType:object predicate:Predicate anchor:self.lastAnchor limit:0 resultsHandler:^(HKAnchoredObjectQuery *query, NSArray<HKSample *> *sampleObjects, NSArray<HKDeletedObject *> *deletedObjects, HKQueryAnchor *newAnchor, NSError *error) { NSLog(@"Sample counts:%ld",sampleObjects.count); for(int i=0;i<(int)sampleObjects.count;i++) { HKQuantitySample *sample = (HKQuantitySample *)[sampleObjects objectAtIndex:i]; HKQuantity *quantity = sample.quantity; double bpm_Values= [quantity doubleValueForUnit:[HKUnit unitFromString:@"count/min"]]; sum_Of_HeartRates=sum_Of_HeartRates+bpm_Values; } avg_heartBeats=sum_Of_HeartRates/(int)sampleObjects.count; }]; [heartQuery setUpdateHandler:^(HKAnchoredObjectQuery *query, NSArray<HKSample *> *SampleArray, NSArray<HKDeletedObject *> *deletedObjects, HKQueryAnchor *Anchor, NSError *error) { HKQuantitySample *sample = (HKQuantitySample *)[SampleArray objectAtIndex:0]; HKQuantity *quantity = sample.quantity; new_Updated_Data =[quantity doubleValueForUnit:[HKUnit unitFromString:@"count/min"]]; NSLog(@"new quantity:%f",new_Updated_Data); }]; [self.healthStore executeQuery:heartQuery]; NSLog(@"updated data %f",new_Updated_Data); NSLog(@"%f", avg_heartBeats); } 

Answer 1

看看下面的代码可以帮助你…

  HKSampleType *sampleType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate]; HKObserverQuery *query = [[HKObserverQuery alloc] initWithSampleType:sampleType predicate:nil updateHandler:^(HKObserverQuery *query, HKObserverQueryCompletionHandler completionHandler, NSError *error) { if (error) { NSLog(@"error occured while setting observer. %@ ", error.localizedDescription); abort(); } // Take whatever steps are necessary to update your app's data and UI // This may involve executing other queries [self executeAnchoredQuery]; // If you have subscribed for background updates you must call the completion handler here. // completionHandler(); }]; [self.healthStore executeQuery:query]; 

然后你写你的函数anchoredQuery代码，这可能会给你一个代码stream的概念：

 -(void)executeAnchoredQuery { HKSampleType *sampleType = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount]; HKAnchoredObjectQuery *query = [[HKAnchoredObjectQuery alloc] initWithType:sampleType predicate:nil anchor:self.anchor limit:HKObjectQueryNoLimit resultsHandler:^(HKAnchoredObjectQuery * _Nonnull query, NSArray<__kindof HKSample *> * _Nullable sampleObjects, NSArray<HKDeletedObject *> * _Nullable deletedObjects, HKQueryAnchor * _Nullable newAnchor, NSError * _Nullable error) { if (error != nil) { // Add proper error handling here... NSLog(@"*** Unable to query for step counts: %@ ***", error.localizedDescription); abort(); } // Process the results... self.anchor = newAnchor; for (HKQuantitySample *sample in sampleObjects) { [self addStepCountSample:sample]; } for (HKDeletedObject *sample in deletedObjects) { [self removeStepCountSample:sample]; } NSLog(@"Done!"); }]; [self.healthStore executeQuery:query]; } 

请通过苹果开发者文档进一步的细节。