swift Navigation barの色を変更する

iOS13から新しいクラスが利用できる

こんなイメージ

UINavigationBarAppearanceを利用する

ios13以前は self.navigationController?.navigationBar.barTintColorを利用する

   override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "DiaryIndex"
        tableView.delegate  = self
        tableView.dataSource  = self
        setupNavigationBar()


    }

    func setupNavigationBar(){
        self.navigationController?.navigationBar.prefersLargeTitles = true
        self.navigationController?.navigationBar.tintColor = UIColor.gray
        self.navigationController?.navigationBar.isTranslucent = false

        if #available(iOS 13.0, *) {
            let appearance = UINavigationBarAppearance()
            appearance.configureWithDefaultBackground()
            appearance.backgroundColor = UIColor.yellow
            appearance.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.gray]
            appearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.gray]

            navigationController?.navigationBar.standardAppearance = appearance
            navigationController?.navigationBar.scrollEdgeAppearance = appearance
            navigationController?.navigationBar.compactAppearance = appearance

        } else {
            self.navigationController?.navigationBar.barTintColor = UIColor(cgColor: CGColor(red: 252, green: 248, blue: 118, alpha: 1.0))
            self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.gray]
            self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.gray]
        }
                
    }