ios - Xcode 在不使用 Storyboard时无法在捆绑 NSBundle 中找到名为 'Main' 的 Storyboard

Question

我正在尝试仅使用代码创建一个 UIButton。 我通过 SIGABORT 收到此消息，但我没有使用主 Storyboard 。我不确定主 Storyboard是否还有元素。

我应该如何解决这个问题？

override func viewDidLoad() {
    super.viewDidLoad()

    let button:UIButton = UIButton(frame: CGRect(x: 340, y: 10, width: self.view.frame.width, height: self.view.frame.height / 4))
    button.backgroundColor = .white
    button.setTitle("filter", for: .normal)
    button.setTitleColor(.blue, for: .normal)
    button.addTarget(self, action: #selector(pushButton), for: .touchUpInside)
    self.view.addSubview(button)
}

@objc func pushButton(sender: UIButton){
    print("button pushed")
}

Answer 1

如果你有 XCode 11+，你需要在 SceneDelegate 上设置 rootViewController，你可以这样做:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

var window: UIWindow?

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    guard let windowScene = (scene as? UIWindowScene) else { return }
    window = UIWindow(frame: windowScene.coordinateSpace.bounds)
    window?.windowScene = windowScene
    self.window?.rootViewController = YourViewController() //UINavigationController(rootViewController: YourViewController()) this if you want your controller to be inside navigation.
    window?.makeKeyAndVisible()
}

func sceneDidDisconnect(_ scene: UIScene) {
    // Called as the scene is being released by the system.
    // This occurs shortly after the scene enters the background, or when its session is discarded.
    // Release any resources associated with this scene that can be re-created the next time the scene connects.
    // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
}

func sceneDidBecomeActive(_ scene: UIScene) {
    // Called when the scene has moved from an inactive state to an active state.
    // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}

func sceneWillResignActive(_ scene: UIScene) {
    // Called when the scene will move from an active state to an inactive state.
    // This may occur due to temporary interruptions (ex. an incoming phone call).
}

func sceneWillEnterForeground(_ scene: UIScene) {
    // Called as the scene transitions from the background to the foreground.
    // Use this method to undo the changes made on entering the background.
}

func sceneDidEnterBackground(_ scene: UIScene) {
    // Called as the scene transitions from the foreground to the background.
    // Use this method to save data, release shared resources, and store enough scene-specific state information
    // to restore the scene back to its current state.
}

}

您还需要从目标常规设置中删除“主界面”字段，请检查下图: