Solutions @ hans-eric.com

Problem:

In iOS, updating the user interface should be done in the main thread. However, many asynchronous methods invoke the callback on an arbitrary thread. How can I make sure a particular piece of code is run in the main thread?

Solution:

You need to use the grand central dispatch:

dispatch_async(dispatch_get_main_queue(),^{
    // The code to run on the main thread goes here
    [self.tableView reloadData];
});