TableView data does not get updated with NSOperation

Question

So I'm not sure if I set this up correctly. I have a SearchDisplayController and search bar.

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 150, 44)];
    self.SearchEntry = searchBar;
    self.SearchEntry.tintColor = DARKGRAY_COLOR;
    self.SearchEntry.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
    self.SearchEntry.delegate = self;
    UISearchDisplayController *searchDisplayCtlr = [[UISearchDisplayController alloc] initWithSearchBar:_searchEntry contentsController:self];
    self.SearchController = searchDisplayCtlr;

These go inside a UIToolbar. Because querying the database for certain values can take awhile, I took code out and put it in an NSOperation subclass. At the end, it calls back the ViewController through a delegate to update the actual data:

[self.searchOperationDelegate searchDidFinishWithResults:self.searchResults];

So when actual typing goes in my search bar, I do this:

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if (_queue.operationCount > 0) {
        [_queue cancelAllOperations];
    }

    SearchOperation *search = [[SearchOperation alloc] initWithSearchText:searchText];
    search.searchOperationDelegate = self;
    [self.queue addOperation:search];
}

I am basically canceling any previous search and only searching on what is currently in the searchText string.

And then in my delegate callback method in my ViewController

- (void)searchDidFinishWithResults:(NSArray *)results {
        NSLog(@"resultsList: %i", [results count]);
    [self performSelectorOnMainThread:@selector(setResultsList:) withObject:results waitUntilDone:YES];
//    [self.searchDisplayController.searchResultsTableView reloadData];
}

I also have a log in my cellForRowAtIndexPath method to check how many items are in my [results count]. When I look, I basically get cellForRowAtIndexPath called many times (say 1000-3000 based on what we are searching for), but then in my searchDidFinishWithResults: method, I get 1 item. It's always cellForRowAtIndexPath that gets called, and then this searchDidFinishWithResults: method. So after I update the model, the table doesn't update again and I'm not sure why. I thought I could manually call reloadData, but that gives me the same results.

So a more concrete example of what get's logged is this:

resultsList: 2909 (I type in one key, and only this gets logged)
tableView:cellForRowAtIndexPath:] 2909 (my second key in the search bar, this gets logged)
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
tableView:cellForRowAtIndexPath:] 2909
resultsList: 1370 (this is the last thing that gets logged when my 2nd key is pressed)
tableView:cellForRowAtIndexPath:] 1370 (this is the first thing that gets logged when my 3rd key is pressed)
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
tableView:cellForRowAtIndexPath:] 1370
resultsList: 1 (last thing that gets logged when my 3rd key is pressed)

Any thoughts? Thanks in advance!

score 0 · Accepted Answer · answered Feb 12 '13 at 22:25

0

Ok I figured it out. reloadData does work. Problem was I was trying to call

[self.searchDisplayController.searchResultsTableView reloadData];

instead of

[self.SearchController.searchResultsTableView reloadData];

answered Feb 12 '13 at 22:25

Crystal

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TableView data does not get updated with NSOperation

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