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//DependencyServiceから利用する
public interface INotificationService
{
    //iOS用の登録
    void Regist();
    //通知する
    void On(string title, string subTitle, string body);
    //通知を解除する
    void Off();
}

using System;
using Foundation;
using UIKit;
using Xamarin.Forms;
[assembly: Dependency(typeof(NotificationService))]
public class NotificationService : INotificationService
{
    public void Regist()
    {
        if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
        {
            // 許可をもらう通知タイプの種類を定義
            UNAuthorizationOptions types = UNAuthorizationOptions.Badge | // アイコンバッチ
                                            UNAuthorizationOptions.Sound | // サウンド
                                            UNAuthorizationOptions.Alert;  // テキスト

            UNUserNotificationCenter.Current.RequestAuthorization(types, (granted, err) => {
                // Handle approval
                if (err != null)
                {
                    System.Diagnostics.Debug.WriteLine(err.LocalizedFailureReason + System.Environment.NewLine + err.LocalizedDescription);
                }
                if (granted)
                {                        
                }
            });
        }
    }

    public void On(string title, string subTitle, string body)
    {
        UIApplication.SharedApplication.InvokeOnMainThread(delegate
        {
            var content = new UNMutableNotificationContent();
            content.Title = title;
            content.Subtitle = title;
            content.Body = body;
            content.Sound = UNNotificationSound.Default;
            
            var trigger = UNTimeIntervalNotificationTrigger.CreateTrigger(5, false); //５秒後に通知、リピートしない
            //日時を指定する場合は以下の方法
            //NSDateComponents components = new NSDateComponents();
            //components.TimeZone = NSTimeZone.DefaultTimeZone;
            //components.Year = _notifyDate.LocalDateTime.Year;
            //components.Month = _notifyDate.LocalDateTime.Month;
            //components.Day = _notifyDate.LocalDateTime.Day;
            //components.Hour = _notifyDate.LocalDateTime.Hour;
            //components.Minute = _notifyDate.LocalDateTime.Minute;
            //components.Second = _notifyDate.LocalDateTime.Second;
            //var calendarTrigger = UNCalendarNotificationTrigger.CreateTrigger(components, false);

            var requestID = "notifyKey";
            content.UserInfo = NSDictionary.FromObjectAndKey(new NSString("notifyValue"), new NSString("notifyKey"));
            var request = UNNotificationRequest.FromIdentifier(requestID, content, trigger);

            UNUserNotificationCenter.Current.Delegate = new LocalNotificationCenterDelegate();
                    
            // ローカル通知を予約する
            UNUserNotificationCenter.Current.AddNotificationRequest(request, (err) => {
                if (err != null)
                {
                    // Do something with error...
                    LogUtility.OutPutError(err.LocalizedFailureReason + System.Environment.NewLine + err.LocalizedDescription);
                }
            });
            UIApplication.SharedApplication.ApplicationIconBadgeNumber += 1; // アイコン上に表示するバッジの数値
        });
    }
    public void Off()
    {
        UIApplication.SharedApplication.InvokeOnMainThread(delegate
        {
            //全ての送信待ちの通知を削除する場合
            //UNUserNotificationCenter.Current.RemoveAllDeliveredNotifications();
            //通知時に設定したキーを元に通知情報をキャンセル
            UNUserNotificationCenter.Current.RemovePendingNotificationRequests(new string[] { "notifyKey" });
        });
    }
}

//PCLのXaml.csファイルのロード時等に記述します。
public ContentPage()
{
    //通知設定をiOSに登録
    DependencyService.Get<INotificationService>().Regist();
}
//PCLのXaml.csファイルの任意の場所で記述します。
void OnNotificationClick(object sender, EventArgs e)
{
    //通知を実行
    DependencyService.Get<INotificationService>().On("タイトルテスト", "サブタイトル", "本文テスト");
}

public class LocalNotificationCenterDelegate : UNUserNotificationCenterDelegate
{
    #region Constructors
    public LocalNotificationCenterDelegate()
    {
    }
    #endregion

    #region Override Methods
    public override void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
    {
        // Do something with the notification
        Console.WriteLine("Active Notification: {0}", notification);

        // Tell system to display the notification anyway or use
        // `None` to say we have handled the display locally.
        completionHandler(UNNotificationPresentationOptions.Alert);
    }
    #endregion
}