ioskevinshah

/// NavigationTitleDropDownButton
class NavigationTitleDropDownButton: UIButton {
    
    /// Variable Declaration(s)
    var lblTitle: UILabel = {
        var lbl: UILabel = UILabel()
        lbl.translatesAutoresizingMaskIntoConstraints = false
        lbl.backgroundColor = .clear
        lbl.textAlignment = .center
        lbl.adjustsFontSizeToFitWidth = true

ioskevinshah

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

ioskevinshah

fileprivate var horizontalStackView: UIStackView = {
    let stackView: UIStackView = UIStackView()
    stackView.translatesAutoresizingMaskIntoConstraints = false
    stackView.isUserInteractionEnabled = false
    stackView.alignment = .center
    stackView.axis = .horizontal
    stackView.distribution = .equalCentering
    stackView.spacing = 4
    return stackView
}()

ioskevinshah

var imgVDropDown: UIImageView = {
    var imgV: UIImageView = UIImageView(image: UIImage(named: "ic_dropDown")?.withRenderingMode(.alwaysTemplate))
    imgV.tintColor = .blue
    return imgV
}()

ioskevinshah

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

ioskevinshah

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

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

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

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