CustomTableHeaderView.swift

//
// Reference from http://samwize.com/2015/11/06/guide-to-customizing-uitableview-section-header-footer/
//
class TableSectionHeader: UITableViewHeaderFooterView {
    @IBOutlet weak var titleLabel: UILabel!
}

let nib = UINib(nibName: "TableSectionHeader", bundle: nil)
tableView.registerNib(nib, forHeaderFooterViewReuseIdentifier: "TableSectionHeader")

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    // Dequeue with the reuse identifier
    let cell = self.tableView.dequeueReusableHeaderFooterViewWithIdentifier("TableSectionHeader")
    let header = cell as! TableSectionHeader
    header.titleLabel.text = title
 
    return cell
}