(iOS 5) when getting list of Twitter accounts, TableView hangs?

Question

I'm trying to get a list of twitter accounts to load up a UITableViewController that contains the data. I use this function:

- (void)viewDidLoad {
    [accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) {
       ...
       [[self tableView] insertRowsAtIndexPaths ...];
       [[self tableView] reloadData];
       NSLog("This message appears immediately");
       ...
    }];
    NSLog("This message appears immediately");
}

For some reason, the interface seems to "hang" for 5 seconds before the table actually gets updated / redrawn (note that I AM calling reloadData!). All my log messages get printed right away, so I'm not sure what's causing the interface to freeze up.

Answer 1

All,

So, I figured it out (sort of). I guess it has something to do with the threads, I wasn't supposed to do any UI stuff in that thread.

To fix it, I surrounded the table stuff with some dispatching code:

[account requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) 
 { dispatch_async(dispatch_get_main_queue(), ^{
     ...
});}];

Still need to understand what's going on here, but hopefully this will help if someone runs into the same problem.