CODEWITHSUNDEEP
iosasynchronousuitableview
Matthias_164
Matthias_164

Reputation: 191

UITableView not showing first time, only when scrolling a bit

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?

Upvotes: 4

Views: 2791

Answers (3)

Fernando Rocha
Fernando Rocha

Reputation: 2599

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.

Upvotes: 0

Matthias_164
Matthias_164

Reputation: 191

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.

Upvotes: 8

Michal Shatz
Michal Shatz

Reputation: 1416

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.

Upvotes: 0

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