Two of a simplest approaches is to use delegate method viewForHeaderInSection and return header view in a form of UIView itself or Custom class inheriting UITableViewHeaderFooterView.

Using custom header view in the form of just UIView is good when we have something more than text to show in header.

override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerView = UIView()
    headerView.backgroundColor = UIColor.systemBlue
    return headerView
}

The other way - more flexible - is to have custom class of UITableViewHeaderFooterView. This approach gives much flexibility to have custom states and properties to handle for complex headers. Example code:

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class CustomHeader: UITableViewHeaderFooterView {
    let title = UILabel(frame: CGRect(x: 0, y: 0, width: 50, height: 40))
    let image = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 40))
    override init(reuseIdentifier: String?) {
        super.init(reuseIdentifier: reuseIdentifier)
        configureContents()
    }    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
}

Now we register our class, dequeue and return it in viewForHeaderInSection:

tableView.register(CustomHeader.self, forHeaderFooterViewReuseIdentifier: “customSectionHeader”)


override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerView = tableView.dequeueReusableHeaderFooterView(withIdentifier: “customSectionHeader”) as! CustomHeader
    return headerView
}

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