app被销毁或被杀时，点击推送通知后如何打开特定的控制器

// 在AppDelegate中注册远程通知的代理方法
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    UNUserNotificationCenter.current().delegate = self
    // 其他初始化代码
    return true
}

// 实现UNUserNotificationCenterDelegate代理方法
extension AppDelegate: UNUserNotificationCenterDelegate {
    // 接收到推送通知时调用
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        // 解析推送通知的payload
        if let controllerIdentifier = userInfo["controller"] as? String {
            // 判断要打开的控制器是哪个
            if controllerIdentifier == "ViewController1" {
                // 打开特定的控制器
                let viewController1 = ViewController1()
                // 使用导航控制器的pushViewController方法打开控制器
                navigationController?.pushViewController(viewController1, animated: true)
            } else if controllerIdentifier == "ViewController2" {
                // 打开特定的控制器
                let viewController2 = ViewController2()
                // 使用present方法打开控制器
                present(viewController2, animated: true, completion: nil)
            }
        }
        completionHandler()
    }
}