Xamarin iOS 中的可操作推送通知答案

【问题标题】：Actionable push notification in Xamarin iOSXamarin iOS 中的可操作推送通知
【发布时间】：2019-12-11 09:35:14
【问题描述】：

        var acceptAction = UNNotificationAction.FromIdentifier("AcceptAction", "Accept", UNNotificationActionOptions.None);
            var declineAction = UNNotificationAction.FromIdentifier("DeclineAction", "Decline", UNNotificationActionOptions.None);

                // Create category
            var meetingInviteCategory = UNNotificationCategory.FromIdentifier("MeetingInvitation",
                new UNNotificationAction[] { acceptAction, declineAction }, new string[] { }, UNNotificationCategoryOptions.CustomDismissAction);

            // Register category
            var categories = new UNNotificationCategory[] { meetingInviteCategory };
            UNUserNotificationCenter.Current.SetNotificationCategories(new NSSet<UNNotificationCategory>(categories));

如何接收自定义的可操作推送通知以及需要将上述代码放在哪个文件中？

【问题讨论】：

应用程序启动后，应通过将上述代码添加到 AppDelegate 的 FinishedLaunching 方法并设置所需的通知类型 (UNAuthorizationOptions) 来请求通知权限。检查docs.microsoft.com/en-us/xamarin/ios/platform/…
我会把它作为答案发布，你能接受吗？会帮助更多的人。

标签： c# xamarin push-notification xamarin.ios apple-push-notifications

【解决方案1】：

在 iOS 应用程序可以向用户发送通知之前，应用程序必须在系统中注册，并且由于通知是对用户的中断，因此应用程序必须在发送通知之前明确请求权限。

应在应用启动后立即请求通知权限，方法是将以下代码添加到 AppDelegate 的 FinishedLaunching 方法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，当应用程序在前台并触发通知时，它可以以不同的方式处理通知。通过提供一个 UNUserNotificationCenterDelegate 并实现 UserNotificationCenter 方法，应用程序可以接管显示通知的责任。例如：

using System;
using ObjCRuntime;
using UserNotifications;


namespace xxx
{
 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();
    }

  }
}

【讨论】：