升级Xcode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。
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：
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
}
非常感谢任何关于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：
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()
}
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