1 创建：FirstViewController、SecondViewController
2、在FirstViewController的viewDidLoad设置属性
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.title = “第一页”
self.view.backgroundColor = UIColor.brown
self.navigationItem.rightBarButtonItem =
UIBarButtonItem(title：”下一页”, style：
UIBarButtonItemStyle.plain, target：self, action：
selector(FirstViewController.nextPage))
}
func nextPage()
{
let viewController = SecondViewController()
self.navigationController？.pushViewController(viewController,
animated：true)
}
3、AppDelegate.swift中的didFinishLaunchingWithOptions
func application(_ application：UIApplication,
didFinishLaunchingWithOptions launchOptions： [NSObject：
AnyObject]？) -> Bool
{
// Override point for customization after application launch.
let viewController = FirstViewController()
let navigationController =
UINavigationController(rootViewController：viewController)
self.window？.rootViewController =navigationController
return true
}
4、SecondSubViewController.swift
import UIKit
var pageNum = 0
class SecondViewController：UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
pageNum = pageNum + 1
self.title = “第(pageNum)页”
self.view.backgroundColor = UIColor.purple
let push = UIButton(frame：CGRect(x：40, y：120,
width：240, height：40))
push.setTitle(“Push Page”, for：UIControlState())
push.backgroundColor = UIColor.orange
push.addTarget(self, action：
selector(SecondViewController.pushPage), for：
UIControlEvents.touchUpInside)
self.view.addSubview(push)
let pop = UIButton(frame：CGRect(x：40, y：180,
width：240, height：40))
pop.setTitle(“Pop Page”, for：UIControlState())
pop.backgroundColor = UIColor.orange
pop.addTarget(self, action：
selector(SecondViewController.popPage), for：
UIControlEvents.touchUpInside)
self.view.addSubview(pop)
let index = UIButton(frame：CGRect(x：40, y：280,width：240, height：40))
index.setTitle(“Goto Index Page”, for：
UIControlState())
index.backgroundColor = UIColor.orange
index.addTarget(self, action：
selector(SecondViewController.gotoIndexPage), for：
UIControlEvents.touchUpInside)
self.view.addSubview(index)
let root = UIButton(frame：CGRect(x：40, y：340,
width：240, height：40))
root.setTitle(“Goto Root Page”, for：UIControlState())
root.backgroundColor = UIColor.orange
root.addTarget(self, action：
selector(SecondViewController.gotoRootPage), for：
UIControlEvents.touchUpInside)
self.view.addSubview(root)
}
}
func pushPage()
{
let viewController = SecondViewController()
self.navigationController？.pushViewController(viewController,animated：true)
}
func popPage()
{
self.navigationController？.popViewController(animated：true)
}
func gotoIndexPage()
{
let viewController =
self.navigationController？.viewControllers[2]
self.navigationController？.popToViewController(viewController！,
animated：true)
}
func gotoRootPage()
{
self.navigationController？.popToRootViewControllerAnimated(animated：true)
}
6、更改导航栏的可见性/导航栏样式修改：FirstSubViewController.swift中的viewWillAppear
override func viewWillAppear(animated：Bool) {
super.viewWillAppear(animated)
self.navigationController？.setToolbarHidden(false,animated：false)
self.navigationController？.setNavigationBarHidden(true,animated：true)
self.navigationItem.prompt = “正在载入……”
self.navigationItem.leftBarButtonItem =
UIBarButtonItem(barButtonSystemItem：.refresh, target：
self, action：#selector(FirstSubViewController.refresh))
self.navigationController？.navigationBar.isTranslucent= false
self.navigationController？.navigationBar.barStyle =UIBarStyle.black
self.navigationController？.navigationBar.tintColor =UIColor.orange
}
func refresh()
{
print(“刷新数据。”)
}