ios - UINavigationBar 标题颜色

Question

为什么当我回到主 UIViewController 时，navigationBar 标题没有将其颜色更改为白色？这是简单的代码(viewWillAppear，viewWillDisappear)，但它不起作用，当我回到这个 VC 上时，标题保持绿色。应用中的主色也是绿色:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    UIApplication.shared.statusBarStyle = .lightContent

    DispatchQueue.main.async {
    self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white, NSAttributedStringKey.font: UIFont(name: "Gotham-Medium", size: 20)!]
    }        
}


override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    UIApplication.shared.statusBarStyle = .default

    navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.green, NSAttributedStringKey.font: UIFont(name: "Gotham-Medium", size: 20)!]


}

Answer 1

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    UIApplication.shared.statusBarStyle = .lightContent

    DispatchQueue.main.async {
       addTitleLabel()
    }        
}


override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    UIApplication.shared.statusBarStyle = .default
}

func addTitleLabel(){
   var titleLabel: UILabel = UILabel()
   titleLabel.textColor = .white
   titleLabel.textAlignment = .center
   titleLabel.text = "Home"

  self.navigationItem.titleView = titleLabel
}

从 viewWillAppear 调用此方法。