UINavigationBar with subtitle / swift

UINavigationBarWithSubtitle.swift

 
    
   func setTitle(title:String, subtitle:String) -> UIView {
        let titleLabel = UILabel(frame: CGRect(x:0, y:-5, width:0, height:0))
        
        titleLabel.backgroundColor = UIColor.clear
        titleLabel.textColor = UIColor.gray
        titleLabel.font = UIFont.boldSystemFont(ofSize: 17)
        titleLabel.text = title
        titleLabel.sizeToFit()
        
        let subtitleLabel = UILabel(frame: CGRect(x:0, y:18, width:0, height:0))
        subtitleLabel.backgroundColor = UIColor.clear
        subtitleLabel.textColor = UIColor.black
        subtitleLabel.font = UIFont.systemFont(ofSize: 12)
        subtitleLabel.text = subtitle
        subtitleLabel.sizeToFit()
        
        let titleView = UIView(frame: CGRect(x:0, y:0, width:max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), height:30))
        titleView.addSubview(titleLabel)
        titleView.addSubview(subtitleLabel)
        
        let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width
        
        if widthDiff > 0 {
            var frame = titleLabel.frame
            frame.origin.x = widthDiff / 2
            titleLabel.frame = frame.integral
        } else {
            var frame = subtitleLabel.frame
            frame.origin.x = abs(widthDiff) / 2
            titleLabel.frame = frame.integral
        }
        
        return titleView
}


// Use : 
self.navigationItem.titleView = setTitle("title", "subtitle")

// Source : http://stackoverflow.com/questions/12914004/uinavigationbar-titleview-with-subtitle
    

I joined @odonckers and @blinkelvin code together

 func setTitle(title: String, titleColor: UIColor, titleSize: Int, subtitle: String, subtitleColor: UIColor, subtitleSize: Int , view: UIView) -> UIView {
    let titleLabel = UILabel(frame: CGRect(x:0, y:-5, width: view.frame.width - 100, height: 20))

    titleLabel.backgroundColor = UIColor.clear
    titleLabel.textColor = titleColor
    titleLabel.adjustsFontSizeToFitWidth = false
    titleLabel.font = UIFont.boldSystemFont(ofSize: CGFloat(titleSize))
    titleLabel.lineBreakMode = .byTruncatingTail
    titleLabel.textAlignment = .center
    titleLabel.text = title
    
    let subtitleLabel = UILabel(frame: CGRect(x:0, y:18, width: view.frame.width - 100, height: 10))
    subtitleLabel.backgroundColor = UIColor.clear
    subtitleLabel.textColor = subtitleColor
    subtitleLabel.adjustsFontSizeToFitWidth = false
    subtitleLabel.lineBreakMode = .byTruncatingTail
    subtitleLabel.textAlignment = .center
    subtitleLabel.font = UIFont.systemFont(ofSize: CGFloat(subtitleSize))
    subtitleLabel.text = subtitle
    
    let titleView = UIView(frame: CGRect(x:0, y:0, width: view.frame.width - 30, height:30))
    titleView.addSubview(titleLabel)
    titleView.addSubview(subtitleLabel)

    return titleView
}

here is an example of how to use it

 self.navigationItem.titleView = setTitle(title: "TITLE", titleColor: UIColor.black, titleSize: 16, subtitle: "SUBTITle", subtitleColor: UIColor.gray, subtitleSize: 12, view: self.view)

I notice it looks very good with Regular NavigationBar
but with Large NavigationBar it stays on the same size

it needs to improve with Large Navigation bar