看起来正确的方法是设置排序描述符您创建它时的查询。这些内容：

Looks like the right way to do this would be to set the sort descriptor of your query when you create it. Something along these lines:

NSMetadataQuery *query = [[NSMetadataQuery alloc] init];
[query setSearchScopes:[NSArray arrayWithObject:
                            NSMetadataQueryUbiquitousDocumentsScope]];

NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K ENDSWITH '.bin'", 
                                   NSMetadataItemFSNameKey];
[query setPredicate:pred];

NSSortDescriptor *sortDescriptor = 
    [[[NSSortDescriptor alloc] initWithKey:NSMetadataItemFSContentChangeDateKey 
                                 ascending:FALSE] autorelease]; //means recent first
NSArray *sortDescriptors = [NSArray arrayWithObjects:
                                sortDescriptor,
                                nil];        
[query setSortDescriptors:sortDescriptors];

[[NSNotificationCenter defaultCenter] 
     addObserver:self 
     selector:@selector(queryDidFinishGathering:) 
     name:NSMetadataQueryDidFinishGatheringNotification 
     object:query];

[query startQuery];