ios - Xamarin iOS 本地推送通知

Question

如何安排本地(无服务器)推送通知(不是警报)从我的应用程序触发？我只想从我的应用程序安排一个通知，并让它在通知中心的给定时间触发。我尝试使用 LocalNotifications，但它们似乎仅在应用程序打开时才起作用，并且仅在应用程序关闭时更新角标(Badge)。我还认为除非您使用服务器，否则无法发送推送通知。

目前，我可以安排 LocalNotification 并弹出警报，但我希望它在应用程序关闭时起作用，并且我希望在顶部弹出推送通知，而不是警报。

Answer 1

应用程序启动后，应立即请求通知权限，方法是将以下代码添加到 AppDelegate 的 FinishedLaunching 方法中，并设置所需的通知类型 ( UNAuthorizationOptions):

...
using UserNotifications;
...



 public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
   {
       ....

        //after iOS 10
        if(UIDevice.CurrentDevice.CheckSystemVersion(10,0))
        {
            UNUserNotificationCenter center = UNUserNotificationCenter.Current;

            center.RequestAuthorization(UNAuthorizationOptions.Alert | UNAuthorizationOptions.Sound | UNAuthorizationOptions.UNAuthorizationOptions.Badge, (bool arg1, NSError arg2) =>
                 {

                 });

            center.Delegate = new NotificationDelegate();
        }

        else if(UIDevice.CurrentDevice.CheckSystemVersion(8, 0))
        {

            var settings = UIUserNotificationSettings.GetSettingsForTypes(UIUserNotificationType.Alert| UIUserNotificationType.Badge| UIUserNotificationType.Sound,new NSSet());

            UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);

        }

        return true;
    }

iOS 10 的新功能是，当应用程序位于前台并触发通知时，应用程序可以以不同的方式处理通知。通过提供 UNUserNotificationCenterDelegate 并实现 UserNotificationCentermethod，应用可以接管显示通知的责任。例如:

using System;
using ObjCRuntime;
using UserNotifications;


namespace workplat
{
 public class NotificationDelegate:UNUserNotificationCenterDelegate
   {
    public NotificationDelegate()
    {
    }

    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|UNNotificationPresentationOptions.Sound);
    }


    public override void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
    {
        // Take action based on Action ID
        switch (response.ActionIdentifier)
        {
            case "reply":
                // Do something
                break;
            default:
                // Take action based on identifier
                if (response.IsDefaultAction)
                {
                    // Handle default action...
                }
                else if (response.IsDismissAction)
                {
                    // Handle dismiss action
                }
                break;
        }

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

  }
}

要创建并向系统注册自定义操作，请使用以下代码:

 public void RegisterNotification(long time)
    {
        UNUserNotificationCenter center = UNUserNotificationCenter.Current;

        //creat a UNMutableNotificationContent which contains your notification content
        UNMutableNotificationContent notificationContent = new UNMutableNotificationContent();

        notificationContent.Title = "xxx";
        notificationContent.Body= "xxxx";

        notificationContent.Sound = UNNotificationSound.Default;

        UNTimeIntervalNotificationTrigger trigger = UNTimeIntervalNotificationTrigger.CreateTrigger(time, false);

        UNNotificationRequest request = UNNotificationRequest.FromIdentifier("FiveSecond", notificationContent, trigger);


        center.AddNotificationRequest(request,(NSError obj) => 
        {



        });

    }

当你调用这个方法时，例如:

RegisterNotification(20);//set the time you want to push notification

如果您关闭应用程序，通知将在 20 秒后推送。

我的demo已经上传到我的github了，大家可以下载引用:Demo Link 。

您可以访问链接以获取更多信息和详细信息:MicroSoft Document