ioskevinshah

var lblSubTitle: UILabel = {
    var lbl: UILabel = UILabel()
    lbl.translatesAutoresizingMaskIntoConstraints = false
    lbl.backgroundColor = .clear
    lbl.textAlignment = .center
    lbl.adjustsFontSizeToFitWidth = true
    lbl.minimumScaleFactor = 0.75
    lbl.textColor = .darkGray
    lbl.font = .systemFont(ofSize: UIFont.smallSystemFontSize)
    return lbl

ioskevinshah

fileprivate var verticalStackView: UIStackView = {
    let stackView: UIStackView = UIStackView()
    stackView.translatesAutoresizingMaskIntoConstraints = false
    stackView.isUserInteractionEnabled = false
    stackView.alignment = .center
    stackView.axis = .vertical
    stackView.distribution = .equalCentering
    return stackView
}()

ioskevinshah

// MARK: - UI Related Method(s)
extension NavigationTitleDropDownButton {
  fileprivate func prepareUIView() {
  
  }
}

ioskevinshah

override init(frame: CGRect) {
    super.init(frame: frame)
    /// Preparing UIView
    prepareUIView()
}

ioskevinshah

fileprivate func addSubView() {
    verticalStackView.addArrangedSubview(lblTitle)
    verticalStackView.addArrangedSubview(lblSubTitle)
    addSubview(verticalStackView)
}

ioskevinshah

fileprivate func prepareConstraintForHorizontalStackView() {
    verticalStackView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
    verticalStackView.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
    verticalStackView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: 1).isActive = true
    verticalStackView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 1).isActive = true
}

ioskevinshah

fileprivate func prepareUIView() {
    /// Adding SubView(s)
    addSubView()
    /// Preparing constraint(s)
    prepareConstraintForHorizontalStackView()
}

ioskevinshah

// MARK: - Configuartion Related Method(s)
extension NavigationTitleDropDownButton {
    func configure(_ title: String, subTitle: String? = nil) {
        lblTitle.text = title
        lblSubTitle.text = subTitle
        lblSubTitle.isHidden = (subTitle?.isEmpty == true)
    }
}

ioskevinshah

/// Variable Declaration(s)
var navigationButtonView: NavigationTitleDropDownButton = NavigationTitleDropDownButton()

ioskevinshah

func prepareNavigationBar() {
    navigationButtonView.addTarget(self, action: #selector(handleNavigationTitleSelection(_:)), for: .touchUpInside)
    navigationButtonView.configure("Kevin Shah", subTitle: "iOS Developer")
    navigationItem.titleView = navigationButtonView
}