Xamarin.ios uilocalnotification.userinfo在关闭应用程序后无效

Question

当应用程序打开时应尽其所能。但是在某些情况下，关闭申请后，本地通知仍在通知中心中。然后单击通知开始应用程序，并应在 appdelegate.finedlaunching 方法的选项中传递通知数据。选项包含键 uiapplicationlaunchoptionslocalnotificationkeykey ，其具有 uikit.uilocalnotification类型的值。此值包含应填充通知数据的UserInfo属性。但是此UserInfo为null。

另一个问题是何时在通知中心中保留本地通知并重新启动应用程序。单击通知引起应用程序重新启动并立即停止。

您有这样的问题吗？Xamarin有问题吗？如何处理这种情况？

创建通知：

public void DisplayNotification(MessageInfo info)
{
    var notificationCenter = UNUserNotificationCenter.Current;
    var content = new UNMutableNotificationContent();
    content.Title = info.Title;
    content.Body = info.Body;
    content.UserInfo = IosStaticMethods.CreateNsDictFromMessageInfo(info);
    UNNotificationTrigger trigger;
    trigger = UNTimeIntervalNotificationTrigger.CreateTrigger(0.1, false);
    var id = (++_LastNotificationId).ToString();
    var request = UNNotificationRequest.FromIdentifier(id, content, trigger);
    notificationCenter.Delegate = new UserNotificationCenterDelegate();
    notificationCenter.AddNotificationRequest(request, (error) =>
    {
        //handle error
    });
}
internal class UserNotificationCenterDelegate : UNUserNotificationCenterDelegate
{
    public override void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
    {
        completionHandler(UNNotificationPresentationOptions.Alert);
    }
    public override void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
    {
        //do something
    }
}

在AppDelegate.finedlaunching中处理通知

if (options != null)
{
    var notification = options["UIApplicationLaunchOptionsLocalNotificationKey"] as UIKit.UILocalNotification;
    var userInfo = notification.UserInfo;//the userInfo is null
}

Answer 1

似乎Nsdictionary不应包含nsnull值。删除NSNULL值后，即使Nsdictionary文档https://developer.apple.com/documentation/foundation/foundation/nsdictionary表示允许NSNULL。