问如何在iOS 11中引入的UINavigationBar大标题视图上添加自定义视图

EN

class CustomLargeTitleNavigationBar: UINavigationBar {

    override func didMoveToSuperview() {
        super.didMoveToSuperview()

        if #available(iOS 11.0, *) {
            for subview in subviews {
                if let largeTitleLabel = subview.subviews.first(where: { $0 is UILabel }) as? UILabel {
                    let largeTitleView = subview
                    print("largeTitleView:", largeTitleView)
                    print("largeTitleLabel:", largeTitleLabel)
                    // you may customize the largeTitleView and largeTitleLabel here
                    break
                }
            }
        }
    }
}

import UIKit
@IBDesignable class CustomNavigationBar: UINavigationBar {
override func layoutSubviews() {
    super.layoutSubviews()
    if #available(iOS 11.0, *) {
        for subview in self.subviews {
            let stringFromClass = NSStringFromClass(subview.classForCoder)
            if stringFromClass.contains("UINavigationBarLargeTitleView") {
                //subview.frame.size.height = 30
                // Custom view
                subview.addSub.....

            }
        }
    }
  }
}