以编程方式创建导航视图

Question

所以我试图创建一个应用程序，但我试图避免使用故事板。因此，只需使用Swift文件和XIB文件。

我曾经在导航控制器上工作过一段时间，但还不够我猜。到目前为止，我有这样的：

在AppDelegate中我有：

let homeVC = HomeViewController() 
let rootVC = UINavigationController(rootViewController: homeVC) 

window!.rootViewController = rootVC 
window!.makeKeyAndVisible() 

我认为目前完全是空的，但自带的创建一个新的XIB文件基本的“视图”屏幕。我已将其大小设置为freeform，其他所有内容如顶栏，状态栏均为Inferred。

在我HomeViewController.swift我：

override func viewDidLoad() { 
    super.viewDidLoad() 

    // Do any additional setup after loading the view. 
    let nib = UINib(nibName: "HomeView", bundle: nil) 
    let objects = nib.instantiateWithOwner(self, options: nil) 
    self.view = objects[0] as! UIView; 

    print(self.navigationController) 

    // customize navigation bar 
    let settingsImage = UIImage(named: "settingsWheelBlack.png") 
    let settingsNavItem = UIBarButtonItem(image: settingsImage, style: UIBarButtonItemStyle.Plain, target: nil, action: Selector("selector")) 
    let addStuffItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: nil, action: Selector("selector")) 

    self.navigationController?.navigationItem.title = "Home" 
    self.navigationController?.navigationItem.leftBarButtonItem = settingsNavItem 
    self.navigationController?.navigationItem.rightBarButtonItem = addStuffItem 

    print(self.navigationController?.navigationBar) 
    print(self.navigationController?.navigationItem.title) 
} 

但是当我运行应用程序的导航栏不显示。以下是我目前所尝试的内容：

1. 将导航栏控件添加到我的XIB并将IB插座连接到它。还要将IB插座连接到导航栏控件中已存在的导航项目。然后设置标题，左键和右键。没有工作

   1. 在上面定义的rootVC中，直接在AppDelegate中设置标题和按钮。没有工作。

任何想法我失踪了？

Answer 1

我在收集一些力量读取大量苹果文档后解决了这个问题。在这个页面上，我发现了这一小段文字：

In a navigation interface, each content view controller in the navigation stack provides a navigation item as the value of its **navigationItem** property. The navigation stack and the navigation item stack are always parallel: for each content view controller on the navigation stack, its navigation item is in the same position in the navigation item stack。

所以我离开了我的AppDelegate代码是和改变了我viewDidLoad功能：

override func viewDidLoad() { 
    super.viewDidLoad() 

    // Do any additional setup after loading the view. 
    let nib = UINib(nibName: "EventsHomeView", bundle: nil) 
    let objects = nib.instantiateWithOwner(self, options: nil) 
    self.view = objects[0] as! UIView; 

    print(self.navigationController) 

    // customize navigation bar 
    let settingsImage = UIImage(named: "settingsWheelBlack.png") 
    let settingsNavItem = UIBarButtonItem(image: settingsImage, style: UIBarButtonItemStyle.Plain, target: nil, action: Selector("selector")) 
    let addStuffItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: nil, action: Selector("selector")) 

    // Each VC within a navigation controller has it's own navigationItem property that the underlying navigation controller uses to show in the navigationBar 
    self.navigationItem.title = "Home" 
    self.navigationItem.leftBarButtonItem = settingsNavItem 
    self.navigationItem.rightBarButtonItem = addStuffItem 
} 

和中提琴！