title: CoreData Sort By NSDate not work?
body: <p>In Code:</p>
  
  <pre><code>- (NSFetchedResultsController *)getFetchedResultsController {
      if (_fetchedResultsController != nil) {
          return _fetchedResultsController;
      }
      [NSFetchedResultsController deleteCacheWithName:@"LatestNews"];
      NSFetchRequest *request = [[NSFetchRequest alloc] init];
      [request setEntity:[NSEntityDescription entityForName:@"News" inManagedObjectContext:self.managedObjectContext]];
      [request setFetchLimit:kDefaultNewsLimit];
      [request setFetchBatchSize:20];
      [request setIncludesSubentities:NO];
      [request setIncludesPropertyValues:NO];
      NSSortDescriptor *dateSortor = [NSSortDescriptor sortDescriptorWithKey:@"dateAdded" ascending:NO];
      [request setSortDescriptors:[NSArray arrayWithObject:dateSortor]];
  
      _fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"LatestNews"];
      _fetchedResultsController.delegate = self;
  
      return _fetchedResultsController;
  }
  
  - (void)viewDidAppear:(BOOL)animated
  {
      [super viewDidAppear:animated];
      if (isFirstLoading) {
          [refreshView refreshLastUpdatedDate];
          NSError *error;
          if (![self.fetchedResultsController performFetch:&amp;error]) {
              if ([error code]) {
                  NSLog(@"%@", [error localizedDescription]);
                  exit(EXIT_FAILURE);
              }
          }
          loadMoreButton.hidden = self.numberOfLimitedNews &gt; 0 ? NO : YES;
          [self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:YES];
  
          [self.tableView setContentOffset:CGPointMake(0, -70) animated:YES];
  
          [refreshView setState:EGOOPullRefreshLoading];
          isRefreshing = YES;;
          [self performSelector:@selector(fetchNewsFromInternet) withObject:nil afterDelay:2];
          isFirstLoading = NO;
      }
  }
  </code></pre>
  
  <p>The results:</p>
  
  <pre><code>2011-09-13 16:48:20.959 HJNews[5971:bc03] 2011-02-04 06:00:00 +0000
  2011-09-13 16:48:21.079 HJNews[5971:bc03] 2011-09-13 08:29:48 +0000
  2011-09-13 16:48:21.230 HJNews[5971:bc03] 2011-02-19 01:30:00 +0000
  2011-09-13 16:48:21.463 HJNews[5971:bc03] 2011-09-13 08:45:00 +0000
  2011-09-13 16:48:21.879 HJNews[5971:bc03] 2011-03-06 02:00:00 +0000
  2011-09-13 16:48:22.143 HJNews[5971:bc03] 2010-12-01 02:40:00 +0000
  2011-09-13 16:48:22.229 HJNews[5971:bc03] 2011-09-13 02:03:43 +0000
  2011-09-13 16:48:22.313 HJNews[5971:bc03] 2011-09-13 08:10:33 +0000
  2011-09-13 16:48:22.446 HJNews[5971:bc03] 2011-01-02 06:00:00 +0000
  2011-09-13 16:48:22.627 HJNews[5971:bc03] 2011-09-13 08:45:00 +0000
  2011-09-13 16:48:22.978 HJNews[5971:bc03] 2011-01-23 02:00:01 +0000
  2011-09-13 16:48:23.092 HJNews[5971:bc03] 2011-09-13 03:35:40 +0000
  2011-09-13 16:48:23.196 HJNews[5971:bc03] 2011-02-18 06:20:00 +0000
  2011-09-13 16:48:23.346 HJNews[5971:bc03] 2011-09-13 00:00:00 +0000
  2011-09-13 16:48:23.812 HJNews[5971:bc03] 2011-02-08 06:00:00 +0000
  2011-09-13 16:48:23.980 HJNews[5971:bc03] 2011-09-12 01:40:10 +0000
  2011-09-13 16:48:24.179 HJNews[5971:bc03] 2011-01-18 06:00:00 +0000
  2011-09-13 16:48:26.257 HJNews[5971:bc03] 2010-12-22 06:30:00 +0000
  2011-09-13 16:48:27.783 HJNews[5971:bc03] 2011-02-08 06:00:00 +0000
  2011-09-13 16:48:27.784 HJNews[5971:bc03] 2011-09-12 01:40:10 +0000
  2011-09-13 16:48:27.785 HJNews[5971:bc03] 2011-01-18 06:00:00 +0000
  2011-09-13 16:48:27.785 HJNews[5971:bc03] 2010-12-22 06:30:00 +0000
  2011-09-13 16:48:27.786 HJNews[5971:bc03] 2011-09-13 02:10:17 +0000
  </code></pre>
  
  <p>I don't know why it doesn't work, I seems sort by shuffle... anyone help me?</p>
  
  <p><strong>It's normal when first loading, but abnormal when tap load more button or change the (<a href="http://www.firestudio.cn/wp-content/uploads/2011/09/2011-09-15-10.39.57.png" rel="nofollow">category navigation bar</a>)</strong></p>