升级Xcode之后,我的应用程序的关键部分已停止工作。
当我的应用启动时,我运行一个函数来检查布尔标志并设置正确的rootViewController。
但是我一直用来设置它的代码现在已经停止工作
class func setLoginAsInitialViewContoller(window:UIWindow) { print("SET LOGIN") let storyboard = UIStoryboard(name: "Login", bundle: nil) let controller = storyboard.instantiateViewController(withIdentifier: "LoginViewController") controller.modalPresentationStyle = .overFullScreen window.rootViewController = controller window.makeKeyAndVisible() }
具体来说,当应用获得倒数第二行时,window.rootViewController = controller它会因libc++abi.dylib: terminating with uncaught exception of type NSException错误而崩溃。
window.rootViewController = controller
libc++abi.dylib: terminating with uncaught exception of type NSException
上面的函数在一个名为的类中Utilities.swift,我正在从内部调用该函数AppDelegate.swift,如下所示:
Utilities.swift
AppDelegate.swift
class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var storyboard: UIStoryboard? = nil func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { UIApplication.shared.isIdleTimerDisabled = true Utilities.decideInitialViewController(window: self.window!) return true }
非常感谢任何有关如何设置根控制器的解决方案或修复方法。
谢谢!
这是因为AppDelegate不再具有window属性。现在,您必须使用SceneDelegate的scene(_:willConnectTo:options:)方法来更改根视图控制器。如本例所示:
window
scene(_:willConnectTo:options:)
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) { guard let scene = (scene as? UIWindowScene) else { return } // Instantiate UIWindow with scene let window = UIWindow(windowScene: scene) // Assign window to SceneDelegate window property self.window = window // Set initial view controller from Main storyboard as root view controller of UIWindow self.window?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController() // Present window to screen self.window?.makeKeyAndVisible() }