ios 13上的导航栏标题字体问题

let attributes = [
    NSAttributedString.Key.font: UIFont.systemFont(ofSize: 20),
    NSAttributedString.Key.foregroundColor: UIColor.red
]
navigationController?.navigationBar.titleTextAttributes = attributes

NotificationCenter.default.addObserver(self, selector: #selector(didChangePreferredContentSize), name: UIContentSizeCategory.didChangeNotification, object: nil)

@objc func didChangePreferredContentSize() {
    // 根据用户偏好设置调整导航栏标题字体
    let preferredFont = UIFont.preferredFont(forTextStyle: .headline)
    let attributes = [
        NSAttributedString.Key.font: preferredFont
    ]
    navigationController?.navigationBar.titleTextAttributes = attributes
}