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using UserNotifications;
[assembly: Dependency(typeof(NotificationService))]
namespace AppName.iOS.Services
{
    public class NotificationService : INotificationService
    {
        //アクションを取得する
        private UNNotificationCategory[] GetActionCategories()
        {
            // アクションボタン１を作成する
            var actionID1 = "reply";
            var actionTitle1 = "Reply";
            var actionOptions1 = UNNotificationActionOptions.Foreground;
            var action1 = UNNotificationAction.FromIdentifier(actionID1, actionTitle1, actionOptions1);

            // アクションボタン２を作成する
            var actionID2 = "noaction";
            var actionTitle2 = "No Action";
            var actionOptions2 = UNNotificationActionOptions.Destructive; //赤文字で表示する
            var action2 = UNNotificationAction.FromIdentifier(actionID2, actionTitle2, actionOptions2);

            // カテゴリを作成する
            var categoryID = "message";
            var actions = new UNNotificationAction[] { action1, action2 };
            var intentIDs = new string[] { };
            var category = UNNotificationCategory.FromIdentifier(categoryID, actions, intentIDs, UNNotificationCategoryOptions.None);

            // category配列を返す
            var categories = new UNNotificationCategory[] { category };
            return categories;
        }

        public void On(string title, string subTitle, string body)
        {
            UIApplication.SharedApplication.InvokeOnMainThread(delegate
            {
                if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
                {
                    //アクションを取得する
                    var categories = this.GetActionCategories();

                    //通知情報を設定する
                    var content = new UNMutableNotificationContent();
                    ・
                    ・//省略
                    ・
                    //アクションのカテゴリを紐づけ
                    content.CategoryIdentifier = "message";

                    //アクションの設定
                    UNUserNotificationCenter.Current.SetNotificationCategories(new NSSet<UNNotificationCategory>(categories));
                    ・
                    ・//省略
                    ・
                    UNUserNotificationCenter.Current.Delegate = new LocalNotificationCenterDelegate();
                    // ローカル通知を予約する
                    UNUserNotificationCenter.Current.AddNotificationRequest(request, (err) => {
                    ・
                    ・//省略
                    ・
            });
        }
    }
}

namespace AppName.iOS.Services
{
    public class LocalNotificationCenterDelegate : UNUserNotificationCenterDelegate
    {
        //アクション
        public override void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
        {
            // Take action based on Action ID
            switch (response.ActionIdentifier)
            {
                case "reply":
                    //Replyボタンを押下した場合の動作を記述する
                    break;
                default:
                    // Take action based on identifier
                    if (response.IsDefaultAction)
                    {
                        // デフォルトアクションを記述する
                    }
                    else if (response.IsDismissAction)
                    {
                        // キャンセルした場合
                    }
                    break;
            }

            // Inform caller it has been handled
            completionHandler();
        }
    }
}