How can I do it without reloading all table?
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView *header;
You need to use -reloadSections:withRowAnimation:
So when you need to update your headers:
NSIndexSet *headers = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, [self.tableView numberOfSections])];
[self.tableView reloadSections:headers withRowAnimation:UITableViewRowAnimationAutomatic];
If you've only got one section (as you just mentioned in your updated question) you can just call
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];