是否可以从后台模式或在应用程序被终止时打开ViewController？

func applicationDidEnterBackground(_ application: UIApplication) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "ViewControllerIdentifier") as! ViewController
    window?.rootViewController = viewController
}

func applicationWillTerminate(_ application: UIApplication) {
    // 保存应用程序的状态
    UserDefaults.standard.set(true, forKey: "isViewControllerOpen")
}

func applicationDidFinishLaunching(_ application: UIApplication) {
    let isViewControllerOpen = UserDefaults.standard.bool(forKey: "isViewControllerOpen")
    if isViewControllerOpen {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController = storyboard.instantiateViewController(withIdentifier: "ViewControllerIdentifier") as! ViewController
        window?.rootViewController = viewController
    }
}