如何在xamarin.ios原生应用中获取前台推送/远程通知？

using Foundation;
using UIKit;
using UserNotifications;

namespace YourAppNamespace
{
    [Register("AppDelegate")]
    public class AppDelegate : UIApplicationDelegate, IUNUserNotificationCenterDelegate
    {
        public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
        {
            // 注册推送通知
            UNUserNotificationCenter.Current.Delegate = this;
            UNUserNotificationCenter.Current.RequestAuthorization(UNAuthorizationOptions.Alert | UNAuthorizationOptions.Sound | UNAuthorizationOptions.Badge, (approved, error) =>
            {
                if (approved)
                {
                    InvokeOnMainThread(() => UIApplication.SharedApplication.RegisterForRemoteNotifications());
                }
            });

            return true;
        }

        public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
        {
            // 注册远程通知成功后，可以将deviceToken发送到服务器保存
        }

        public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
        {
            // 注册远程通知失败，可以处理错误信息
        }

        [Export("userNotificationCenter:willPresentNotification:withCompletionHandler:")]
        public void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
        {
            // 处理前台推送通知的展示方式，例如显示横幅、播放声音等
            completionHandler(UNNotificationPresentationOptions.Alert | UNNotificationPresentationOptions.Sound);
        }

        [Export("userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:")]
        public void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
        {
            // 处理用户对推送通知的响应，例如跳转到指定页面等
            completionHandler();
        }
    }
}