Question

I have a UIViewController with a UITableView in it. I add a UIView as a subview on top of that. When I press one of the UIButtons on the subview, there is a noticeable lag. How do I make it faster?

See video: http://www.youtube.com/watch?v=KWy6NrZUeqA&feature=youtu.be

- (IBAction)tweetThat:(id)sender {
    [MBProgressHUD showHUDAddedTo:self.socialMediaView animated:YES];

    dispatch_queue_t queueOne=dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_sync(queueOne, ^{
        NSString *tweetBody=@"BLABLABLATweet";

        if ([TWTweetComposeViewController canSendTweet])
        {
            TWTweetComposeViewController *tweetSheet = 
            [[TWTweetComposeViewController alloc] init];
            [tweetSheet setInitialText:tweetBody];
            dispatch_async(dispatch_get_main_queue(), ^{
                [MBProgressHUD hideHUDForView:self.controllerView animated:YES];
                [self presentModalViewController:tweetSheet animated:YES];
            });
        }
        });
}

Answer 1

change your dispatch_sync to dispatch_async. what is the point of dispatching to the background if you are going to lock up the UI until it returns.