UITableView not showing first time, only when scro

Question

I have a UITableViewController, which is loading data from a NSURLConnection:

NSURL *url = [NSURL URLWithString:@"http://url.now"];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30.0];

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
    if ([data length] > 0 && error == nil){
        NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
        [parser setDelegate:self];
        [parser parse];
    }
    else if (error != nil){
        UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"No internet connection" message:@"Content." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:true];
    }
}];

When the parsing ends, the reloaddata method is called. But when the app is loaded, the content of the UITableView is not showing. When I scroll a bit, it get's visible immediately. Reloading is no problem.

How can this be fixed?

Answer 1

Unchecking "Use Size Classes" option and then coming back and re-checking it again fixes this issue.

• In the project navigator, select a storyboard or xib file.
• The file’s contents open in Interface Builder.
• Choose View > Utilities > Show File Inspector.
• In the Interface Builder Document section, un-tick the "Use Size Classes" checkbox.
• Leave the menu. Come back and tick the "Use Size Classes" checkbox again.

Answer 2

What probably happened is that your table loads faster than the time it takes for your commotion to download data. Add a delegate to the class that manage your data and make your table view controller conform to that delegate protocol. Than, once data is downloaded and parsed reload the table.

Answer 3

Solved it. Changed the tableView reloadData to this:

 dispatch_async(dispatch_get_main_queue(), ^{
        [self.tableView reloadData];
 });

And it worked like a charm. Thanks for all answers and comments.