title: Grouped UITableview remove outer separator line
body: <p>I have a grouped UITableview which is created programatically. Also I have a cell with xib file populated in tableview programmatically as well. So far so good. But I want to only remove outer separator line. I used below code but this time removed all separator line. </p>
  
  <blockquote>
    <p>self.tableView.separatorColor = [UIColor clearColor];</p>
  </blockquote>
  
  <p>this is not good option for my situation. Here is the screenshot what i want to do;</p>
  
  <p><img src="https://i.stack.imgur.com/nNUTQ.png" alt="enter image description here"></p>