Determine the title for each section in a UITableView.

titleForHeaderInSection.swift

//  Use tableView(_:titleForHeaderInSection:) to set the title for each section in a table view.
//  This example exhibits two instances of this method used in this app.

//  This demonstrates the use of this method in this app's UITableViewDataSource view controller.
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    switch section {
    case 0:
      return "Configuring a Table View"
    default:
      print("out of index")
      return ""
    }
}

//  This demonstrates the use of this method in this app's UITableViewDelegate view controller.
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        switch section {
        case 0:
            return "Configuring Rows"
        case 1:
            return "Managing Selections"
        case 2:
            return "Handling Swipe Actions"
        default:
            print("out of index")
            return ""
        }
    }