本文將演示對導航欄進行樣式設定，以及更改導航頂部的提示區。

選擇編輯第一個檢視控制器檔案。

 1 import UIKit
 2 
 3 class FirstSubViewController: UIViewController {
 4 
 5     override func viewDidLoad() {
 6         super.viewDidLoad()
 7 
 8         // Do any additional setup after loading the view.
 9         self.title = "First Page
 
"
10         self.view.backgroundColor = UIColor.brown
11         self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Next", style: UIBarButtonItem.Style.plain, target: self, action: #selector(FirstSubViewController.nextPage))
12     }
13     
14     @objc func nextPage()
15     {
 
16         let viewController = SecondSubViewController()
17         self.navigationController?.pushViewController(viewController, animated: true)
18     }
19 
20     //建立檢視控制器物件的生命週期中的，檢視即將顯示的代理方法。
21     //檢視在即將顯示時，，執行這個方法
22     override func viewWillAppear(_ animated: Bool) {
23         //首先實現父類的同名方法
 

24         super.viewWillAppear(animated)
25         //設定頂部導航區的提示文字
26         self.navigationItem.prompt = "Loading..."
27         //設定導航欄的背景是否透明
28         self.navigationController?.navigationBar.isTranslucent = false
29         //設定導航欄的系統樣式
30         self.navigationController?.navigationBar.barStyle = UIBarStyle.black
31         //設定導航欄的前景顏色。
32         self.navigationController?.navigationBar.tintColor = UIColor.orange
33     }
34 
35     override func didReceiveMemoryWarning() {
36         super.didReceiveMemoryWarning()
37         // Dispose of any resources that can be recreated.
38     }
39 }