UINavigationItem with subtitle

UINavigationItem+SetTitle.swift

extension UINavigationItem {

  func setTitle(title: String, subtitle: String) {
    let one = UILabel()
    one.text = title
    one.font = UIFont.systemFont(ofSize: 17)
    one.sizeToFit()

    let two = UILabel()
    two.text = subtitle
    two.font = UIFont.systemFont(ofSize: 12)
    two.textAlignment = .center
    two.sizeToFit()

    let stackView = UIStackView(arrangedSubviews: [one, two])
    stackView.distribution = .equalCentering
    stackView.axis = .vertical
    stackView.alignment = .center

    let width = max(one.frame.size.width, two.frame.size.width)
    stackView.frame = CGRect(x: 0, y: 0, width: width, height: 35)

    one.sizeToFit()
    two.sizeToFit()

    self.titleView = stackView
  }
}