UIActivityIndicator on UITableView header. ( >= iOS6 )

UIActivitiIndicatorOnUITableViewHeader.mm

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UITableViewHeaderFooterView *sectionHeaderView = nil;
    
    if (section == 1) {
        sectionHeaderView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"headerIndicatorView"];
        if (sectionHeaderView == nil) {
            sectionHeaderView = [[UITableViewHeaderFooterView alloc] initWithReuseIdentifier:@"headerIndicatorView"];
        }
        
        float indicatorSize = 21.0f;
        activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(120, 7, indicatorSize, indicatorSize)];
        
        [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
        [sectionHeaderView.contentView addSubview:activityIndicator];
        [activityIndicator startAnimating];
    }else{
        sectionHeaderView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"defaultHeader"];
        if (sectionHeaderView == nil) {
            sectionHeaderView = [[UITableViewHeaderFooterView alloc] initWithReuseIdentifier:@"defaultHeader"];
        }
    }
    
    return sectionHeaderView;
}