当用户点击通知时显示来自UNNotificationRequest的ViewController

import UserNotifications

// 在AppDelegate中注册通知
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    UNUserNotificationCenter.current().delegate = self
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
        // 处理授权结果
    }
    return true
}

// 实现UNUserNotificationCenterDelegate的方法
extension AppDelegate: UNUserNotificationCenterDelegate {
    // 当用户点击通知时触发
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let request = response.notification.request
        let content = request.content
        
        // 创建一个ViewController来展示通知内容
        let viewController = NotificationViewController()
        viewController.notificationContent = content
        
        // 在当前窗口中显示ViewController
        if let window = UIApplication.shared.windows.first {
            window.rootViewController = viewController
            window.makeKeyAndVisible()
        }
        
        completionHandler()
    }
}

// 自定义的ViewController类
class NotificationViewController: UIViewController {
    var notificationContent: UNNotificationContent?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 在这里根据notificationContent创建界面，展示通知内容
        // ...
    }
}