Data not loading in UITableView after parsing in background

Question

I'm trying to implement an activity indicator when I parse my XML data.

I found this Activity indicator (spinner) with UIActivityIndicatorView and have it working. However, because I'm using performSelectorInBackground when it finishes parsing none of the data shows up in my tableview.

I have tried [self.tableview reloadData] and I've tried [self.view setNeedsDisplay] however, nothing seems to work.

If I leave the view and come back to it, all the data appears in the tableview cells.

Any ideas?

Answer 1

You should call

[self.tableview reloadData]

in the main thread (you can check in wich thread you'r in with [NSThread isMainThread])

you can do

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
//create background queue
dispatch_queue_t backgroundQueue = dispatch_queue_create("com.mycompany.myqueue", 0);
//dispatch in background
dispatch_async(backgroundQueue, ^{
        //execute long operation in background thread
        self.rssNews = [[ParseRSSNews alloc] initWithUrl:self.url];
    //dispatch in main thread after long operation is finish
    dispatch_async(dispatch_get_main_queue(), ^{  [self.tableView reloadData]; });
});