title: Different height for section header UITableView
body: <p>I have some issue with section header height, so:</p>
  
  <p>In storyboard I defined prototype and I assigned it to the section header view, in Size Inspector with height "100", but I also created a method "heightForHeaderInSection" where I set "90".</p>
  
  <p>The result is that simulator draws section with height 90, but when I call "self.tableView.sectionHeaderHeight" it gives me 100.</p>
  
  <p>How can I get height from "heightForHeaderInSection" with 90 value programmatically?</p>