取XMPPGroupCoreDataStorageObject，但NSManagingContextDidSaveChangesNotification似乎不起作用

Question

- (NSFetchedResultsController *)fetchedGroupResultsController 
{ 
    if (fetchedGroupResultsController == nil) 
    { 
     NSManagedObjectContext *moc = [[self appDelegate] managedObjectContext_roster]; 


    NSEntityDescription *entity = [NSEntityDescription entityForName:@"XMPPGroupCoreDataStorageObject" 
               inManagedObjectContext:moc]; 

    NSSortDescriptor *sd1 = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; 
    //NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"displayName" ascending:YES]; 

    NSArray *sortDescriptors = [NSArray arrayWithObjects:sd1, nil]; 

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
    [fetchRequest setEntity:entity]; 
    [fetchRequest setSortDescriptors:sortDescriptors]; 
    [fetchRequest setFetchBatchSize:10]; 

    fetchedGroupResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest 
                    managedObjectContext:moc 
                    sectionNameKeyPath:@"name" 
                       cacheName:nil]; 
    [fetchedGroupResultsController setDelegate:self]; 

    [sd1 release]; 
    //[sd2 release]; 
    [fetchRequest release]; 

    NSError *error = nil; 
    if (![fetchedGroupResultsController performFetch:&error]) 
    { 
     NSLog(@"Error performing fetch: %@", error); 
    } 

} 

return fetchedGroupResultsController; 

}`

我用這個方法來獲取羣組結果，它works.but當我接觸的一個在線或離線時， - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [[self tableView] reloadData]; } 方法韓元不會被調用，所以我的表視圖將不會被重新加載，並且狀態不會刷新。我很難過，任何人都可以幫助我？

Answer 1

我希望這仍然是有用的..

那是因爲你取什麼XMPPGroupCoreDataStorageObject，而不是XMPPUserCoreDataStorageObject。每當有人是在線還是離線，XMPPUserCoreDataStorageObject名冊上的變化，所以

-(void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [[self tableView] reloadData];

將被調用。

嘗試使用XMPPUserCoreDataStorageObject而不是XMPPGroupCoreDataStorageObject，您將看到區別。