ios - 以编程方式在 Swift 中从一个 UIViewController 移动到另一个

Question

我有 2 个 ViewController。我没有 Storyboard。在第一个 viewController 中完成所有操作后，我想从第一个 View 移动到另一个 View 。有什么方法可以做到？它是这样的，第一个 View 显示图像并在后台进行一些 API 调用。 API 调用成功后，我希望它移动到第二个 ViewController(LoginActivityViewController)。我尝试在第一个 ViewController 中调用它:

var loginActivity = LoginActivityViewController()
self.navigationController.pushViewController(loginActivity, animated: true)

但是，这没有用。如何做到这一点？

这是我在 AppDelegate 中的应用函数

func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    let navigationController: UINavigationController = UINavigationController(rootViewController: RootViewController())
    navigationController.setNavigationBarHidden(true, animated: false)
    window!.rootViewController = navigationController
    window!.makeKeyAndVisible()
    return true
}

这是我的 RootViewController 的 viewDidLoad()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let image1 = UIImage(named: "Default.png")
    let imageview = UIImageView(image: image1)
    self.view.addSubview(imageview)
    var loginActivity = LoginActivityViewController()
    self.navigationController.pushViewController(loginActivity, animated: true)
}

Answer 1

正确启动导航 Controller 后，您的方法应该是这样的:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    let rootViewController: RootViewController = RootViewController(nibName: "RootViewController", bundle: nil)
    let navigationController: UINavigationController = UINavigationController(rootViewController: rootViewController)
    window!.rootViewController = navigationController
    window!.makeKeyAndVisible()
    return true
}

现在您可以将新的 View Controller 推送到层次结构中。

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更新

如果您不想显示导航栏，请将此行插入到上面的代码中。

navigationController.setNavigationBarHidden(true, animated: false)