在单击UIButton时更改视图控制器Swift (不带情节提要)

@IBAction func buttonClicked(_ sender: UIButton) {
    let viewController2 = ViewController2() // 创建ViewController2实例
    self.navigationController?.pushViewController(viewController2, animated: true) // 使用导航控制器切换到ViewController2
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    let navigationController = UINavigationController(rootViewController: ViewController1()) // 创建导航控制器，并将ViewController1设置为根视图控制器
    self.window?.rootViewController = navigationController // 设置导航控制器为根视图控制器
    self.window?.makeKeyAndVisible()
    return true
}