title: how to scroll uitableview, and section header in the top, visible and scroll to
body: <p>i have <code>UITableview</code> with multiple sections with style group, and light custom header view
  after scroll, header not stick in the top, and invisible</p>
  
  <p>i need scroll <code>UITableview</code> and section header stick in the top view and visible, like phonebook</p>
  
  <p>how to make it's ?</p>
  
  <pre><code>- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
  {
      UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320,50)];
      UILabel *labelHeader = [[UILabel alloc] initWithFrame:CGRectMake(20, 5, 120, 40)];
      labelHeader.text = [[_groups objectAtIndex:section] objectForKey:@"nameExerciseGroup"];
      labelHeader.textColor = [UIColor blackColor];
      [labelHeader setFont:[UIFont systemFontOfSize:20]];
  
  [headerView addSubview:labelHeader];
      return headerView;
  }
  
  - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
      return 50;
  }
  </code></pre>