问题描述
我正在使用消息中心来发出通知。第一个工作正常。但第二个没有开火。
MessagingCenter.Subscribe<string>(this,"iOSNotification",(value) =>
{
NotificationDelegate.RegisterNotification("Trip started");
});
MessagingCenter.Subscribe<string>(this,"IosNotMoved",(value) =>
{
NotificationDelegate.RegisterNotification("Would you like to stop trip?");
});
public static void RegisterNotification(string notify)
{
UIlocalnotification notification = new UIlocalnotification();
notification.FireDate = NSDate.FromTimeIntervalSinceNow(1);
notification.AlertAction = "View Alert";
notification.AlertBody = notify;
UIApplication.SharedApplication.Schedulelocalnotification(notification);
}
解决方法
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 FinishedLaunching
的 AppDelegate
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 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 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();
}
}
}
要在系统中创建和注册自定义操作,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
通知将在 20 秒后推送,如果您关闭应用程序。
您可以访问链接以获取更多信息和详细信息:MicroSoft Document