Transition nav bar from translucent to white when scrolling

CustomNavBar.swift

  // Add to View Controller  

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        customNavBar?.makeTransparent = true
        
        // Match the style based scroll view position on the page everytime view appears
        styleNavBarBasedOnScrollViewPosition(tableView)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        customNavBar?.makeTransparent = false
        customNavBar?.layoutSubviews()
    }
    
    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
        styleNavBarBasedOnScrollViewPosition(scrollView)
    }
    
    func styleNavBarBasedOnScrollViewPosition(_ scrollView: UIScrollView) {
        guard let customNavBar = customNavBar else { return }
        let currentY = scrollView.contentOffset.y
        let offset: CGFloat = -64.0
        if currentY > offset && currentY < 0 {
            let alpha = 1 - (abs(currentY) / abs(offset))
            customNavBar.backgroundView?.backgroundColor = UIColor.white.withAlphaComponent(alpha)
            customTitleView.changeAlpha(alpha)
        } else if currentY > 0 {
            customNavBar.backgroundView?.backgroundColor = UIColor.white
            customTitleView.changeAlpha(1)
        } else if currentY <= offset {
            customNavBar.backgroundView?.backgroundColor = UIColor.clear
            customTitleView.changeAlpha(0)
        }
        customNavBar.layoutSubviews()
    }
    
   // Custom Nav Bar
    class CustomNavigationBar: UINavigationBar {
    
    var makeTransparent = false
    var backgroundView: UIView?
    
    override func layoutSubviews() {
        super.layoutSubviews()
        restyleBar()
        
        guard let backgroundView = backgroundView else { return }
        let statusBarHeight = UIApplication.shared.statusBarFrame.size.height
        backgroundView.frame = CGRect(x: bounds.origin.x, y: bounds.origin.y - statusBarHeight, width: bounds.width, height: bounds.height + statusBarHeight)
        sendSubview(toBack: backgroundView)
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        hideSeparatorLine()
        
        barTintColor = UIColor.white
        if let font = UIFont(name: "MuseoSans-700", size: 20.0) {
            titleTextAttributes = [
                NSFontAttributeName: font,
                NSForegroundColorAttributeName: Style.🎀.textBlack90,
            ]
        } else {
            titleTextAttributes = [NSForegroundColorAttributeName: Style.🎀.textBlack90]
        }
        
        backgroundView = UIView()
        guard let backgroundView = backgroundView else { return }
        addSubview(backgroundView)
        backgroundView.backgroundColor = UIColor.clear
        
        // Always set to true and use the backgroundView to control the color / transparency
        isTranslucent = true
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func restyleBar() {
        if !makeTransparent {
            backgroundView?.backgroundColor = UIColor.white
        }
    }
    
 }

Thanks for sharing. customTitleView is UIView or UINavigationBar?