Code snippet for blog series.

reloadData

- (void)reloadData {
    [self.refreshControl beginRefreshing];
    
    [self.dataManager getData:^(NSArray *json) {
        //converte os objetos do servidor no nosso modelo de objetos
        NSMutableArray *items = [NSMutableArray array];
        
        for (NSDictionary *jsonItem in json) {
            TableData *item = [[TableData alloc] initWithJSON:jsonItem];
            item.position = [NSNumber numberWithInteger:[json indexOfObject:jsonItem]+1];
            [items addObject:item];
        }
        
        //salva os objetos e atualiza a table view
        [self.refreshControl endRefreshing];
        self.data = items;
        [self.tableView reloadData];
    } error:^(NSError *error) {
        [self.refreshControl endRefreshing];
        
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"Oops...", nil) message:[NSString stringWithFormat:NSLocalizedString(@"Ocorreu Um Erro\n\n%@",nil),error.localizedDescription] preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil];
        [alert addAction:cancelAction];
        [self presentViewController:alert animated:YES completion:nil];
    }];
}