Subclass UINavigationBar SWIFT

I want to pose my problem with the hope that someone can help me:

I created a subclass of UINavigationBar, adding an image as a background.

here is the code:

class NavigationBarN: UINavigationBar {

let customHeight: CGFloat = UIScreen.main.bounds.height / 8

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    translatesAutoresizingMaskIntoConstraints = true
    self.barStyle = UIBarStyle.black

    self.tintColor = .white
}

override init(frame: CGRect) {
    super.init(frame: frame)
    translatesAutoresizingMaskIntoConstraints = true
    self.barStyle = UIBarStyle.black

    self.tintColor = .white
}

override func sizeThatFits(_ size: CGSize) -> CGSize {
    return CGSize(width: UIScreen.main.bounds.width, height: customHeight)
}
var i = 0
override open func layoutSubviews() {
    super.layoutSubviews()

    frame = CGRect(x: frame.origin.x, y: 0, width: frame.size.width, height: customHeight) // problem here

    for subview in self.subviews {
        var stringFromClass = NSStringFromClass(subview.classForCoder)
        if stringFromClass.contains("BarBackground") {
            subview.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: self.frame.height)

            let imageViewBackground = UIImageView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: customHeight))
            imageViewBackground.image = UIImage(named: “Image”1)
            imageViewBackground.contentMode = .scaleToFill
            subview.addSubview(imageViewBackground)


        }

        stringFromClass = NSStringFromClass(subview.classForCoder)
        if stringFromClass.contains("BarContent") {
            let centerY = subview.frame.heigh
            subview.frame = CGRect(x: subview.frame.origin.x, y: centerY, width: subview.frame.width, height: subview.frame.height)
        }

    }
}


/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
    // Drawing code
}
*/

}

Up to iOS 11, it works without problems since iOS 12 the problems begin, the subclass enters an infinite loop. However the infinite loop occurs only when I try to initialize a new VC through the "navigationController? .PushViewController" function, otherwise it works.

The line of code causing the loop apparently is:

frame = CGRect(x: frame.origin.x, y: 0, width: frame.size.width, height: customHeight)

But removing it the navigation bar is not created correctly.

Anyone have any solution?

Thank You