[MBProgressHUD showHUDAddedTo:self.view animated:YES];

[MBProgressHUD hideHUDForView:self.view animated:YES];

[MBProgressHUD showHUDAddedTo:self.view animated:YES];

dispatch_queue_t myqueue = dispatch_queue_create("queue", NULL);
dispatch_async(myqueue, ^{

    [self performSelectorOnMainThread:@selector(fetchedData:) withObject:nil waitUntilDone:YES];

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.tbl reloadData];
        [MBProgressHUD hideHUDForView:self.view animated:YES];
    });
});

[MBProgressHUD showHUDAddedTo:self.view animated:YES];

dispatch_queue_t myqueue = dispatch_queue_create("queue", NULL);
dispatch_async(myqueue, ^{

    //Whatever is happening in the fetchedData method will now happen in the background
    [self fetchedData:nil];

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.tbl reloadData];
        [MBProgressHUD hideHUDForView:self.view animated:YES];
    });
});