以編程方式創建導航視圖

Question

所以我試圖創建一個應用程序，但我試圖避免使用故事板。因此，只需使用Swift文件和XIB文件。

我曾經在導航控制器上工作過一段時間，但還不夠我猜。到目前爲止，我有這樣的：

在AppDelegate中我有：

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

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

我認爲目前完全是空的，但自帶的創建一個新的XIB文件基本的「視圖」屏幕。我已將其大小設置爲freeform，其他所有內容如頂欄，狀態欄均爲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) 
} 

但是當我運行應用程序的導航欄不顯示。以下是我目前所嘗試的內容：

1. 將導航欄控件添加到我的XIB並將IB插座連接到它。還要將IB插座連接到導航欄控件中已存在的導航項目。然後設置標題，左鍵和右鍵。沒有工作

   1. 在上面定義的rootVC中，直接在AppDelegate中設置標題和按鈕。沒有工作。

任何想法我失蹤了？

Answer 1

我在收集一些力量讀取大量蘋果文檔後解決了這個問題。在這個頁面上，我發現了這一小段文字：

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。

所以我離開了我的AppDelegate代碼是和改變了我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！