Question

我想删除我的应用程序在Health App中为某个HKQuantityType保存的所有HKQuantitySamples，我该怎么做？

我可以看到这个功能 DeleteObject的：withCompletion：在Apple文档中，但我真的不明白如何使用它。有人可以展示一个例子吗？

编辑：我现在使用以下代码进行删除：

我已将食物信息保存为HKCorrelation，并在Correlations元数据HKMetadataKeyExternalUUID键中设置我的本地食物ID。

要删除，我将在startDate和endDate之间获取所有HKCorrelation对象，然后如果其中一个获取的对象与我正在寻找的Local Food ID匹配： - 我删除了相关中的每个对象， - 然后删除相关本身

HKCorrelationType *foodType = [HKObjectType correlationTypeForIdentifier:HKCorrelationTypeIdentifierFood];

NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:startDate endDate:endDate options:HKQueryOptionNone];

HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:foodType predicate:predicate limit:HKObjectQueryNoLimit sortDescriptors:nil resultsHandler:^(HKSampleQuery *query, NSArray *results, NSError *error) {
    if (!results) {
        NSLog(@"An error occured fetching the user's tracked food. In your app, try to handle this gracefully. The error was: %@.", error);

        return;
    }

    dispatch_async(dispatch_get_main_queue(), ^{
        for (HKCorrelation *foodCorrelation in results) {
            if([[foodCorrelation.metadata valueForKey:HKMetadataKeyExternalUUID] isEqualToString:food_id_I_want_to_delete]) {
                NSSet *objs = foodCorrelation.objects;
                for (HKQuantitySample *sample in objs) {
                    [self.healthStore deleteObject:sample withCompletion:^(BOOL success, NSError *error) {
                        if (success) {
                            NSLog(@"Success. delete sample");
                        }
                        else {
                            NSLog(@"delete: An error occured deleting the sample. In your app, try to handle this gracefully. The error was: %@.", error);
                        }
                    }];
                }

                [self.healthStore deleteObject:foodCorrelation withCompletion:^(BOOL success, NSError *error) {
                    if (success) {
                        NSLog(@"Success. delete %@", [foodCorrelation.metadata valueForKey:HKMetadataKeyExternalUUID]);
                    }
                    else {
                        NSLog(@"delete: An error occured deleting the Correlation. In your app, try to handle this gracefully. The error was: %@.", error);
                    }
                }];
                return;
            }
        }
    });
}];

[self.healthStore executeQuery:query];

删除所有HKQuantitySample

0 个答案: