当我尝试推送另一个 Controller 时，我的 UINavigationController 出现问题。

AppDelegate

 let testViewController:ProximityQuestionsIntroductionViewController = ProximityQuestionsIntroductionViewController();
    self.navController = UINavigationController(rootViewController: testViewController);

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds);
    self.window!.rootViewController = navController;
    self.window!.backgroundColor = UIColor.whiteColor();
    self.window!.makeKeyAndVisible();

    return true

ProximityQuestionsIntroductionViewController

class ProximityQuestionsIntroductionViewController:UIViewController {

// Controls
var proximityIntroductionView:ProximityQuestionsIntroductionView!;

// Load components when the view is loaded
override func viewDidLoad() {
    super.viewDidLoad();

    print("nav in viewDidLoad : \(self.navigationController)");
    //Hide Nav bar
    self.navigationController?.navigationBarHidden = true;
    // Set view
    self.proximityIntroductionView = ProximityQuestionsIntroductionView(frame: self.view.frame);
    self.view = self.proximityIntroductionView;
}

func start(){
    print(self);
    print("start in controller");
    let nextController = ProximityQuestionsProgressViewController();
    print("nav in start : \(self.navigationController)");
    self.navigationController?.pushViewController(nextController, animated: true);

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

单击按钮时，我从 ProximityQuestionsIntroductionView 调用 start。 在日志中我看到“nav in start : nil”并且 Controller 没有改变。

更多信息:

• self 实际上是 ProximityQuestionsIntroductionViewController。

• 导航栏真的隐藏了

因此导航 Controller 在 viewDidLoad 中正常，但在其他函数中不正常。

谁能告诉我为什么？

谢谢!

编辑:AppDelegate

        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let initialViewController = storyboard.instantiateViewControllerWithIdentifier("ProximityIntroduction");
    self.navController = storyboard.instantiateViewControllerWithIdentifier("NavigationController") as! UINavigationController;
    self.navController?.setViewControllers([initialViewController], animated: false)
    self.window?.rootViewController = navController;
    self.window?.makeKeyAndVisible();

我将导航 Controller 添加到 Storyboard并更改 ID。但是我在函数 start

最佳答案

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let initialViewController = storyboard.instantiateViewControllerWithIdentifier("ProximityQuestionsIntroductionViewController")
    navigationController = UINavigationController.init(rootViewController:initialViewController )
    navigationController?.setViewControllers([initialViewController], animated: false)
    self.window?.rootViewController = navigationController
    self.window?.makeKeyAndVisible()

为这个 ProximityQuestionsIntroductionViewController 输入 Story board id

关于ios - Swiftui 导航 Controller 变为零，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35743439/