title: How to change the height BETWEEN sections in GROUPED UITableView?
body: <p>The default height is too large for me.
  How can I change the height between two sections?</p>
  
  <p>============================================================================</p>
  
  <p>Sorry for my poor English...
  I mean the gap between two sections is too large. How to change it?</p>
  
  <pre><code>- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
  {
      CGRect frame = CGRectMake(0, 0, tableView.frame.size.width, 2.0f);
      UIView *view = [[[UIView alloc] initWithFrame:frame] autorelease];
      view.backgroundColor = [UIColor blueColor];
      return view;
  }
  
  - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
  {
      CGRect frame = CGRectMake(0, 0, tableView.frame.size.width, 2.0f);
      UIView *view = [[[UIView alloc] initWithFrame:frame] autorelease];
      view.backgroundColor = [UIColor redColor];
      return view;
  }
  </code></pre>
  
  <p>I changed the header view and footer view of each section.
  And here is the result:
  <img src="https://i.stack.imgur.com/7gbev.png" alt="enter image description here"></p>
  
  <p>I think there may be a min height of the gap, because I set the height of header and footer to 2px, but the gap between two sections is still so large.</p>