Xamarin IOS - 应用程序关闭时显示本地通知
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【中文标题】Xamarin IOS - 应用程序关闭时显示本地通知【英文标题】:Xamarin IOS - Show local notification when application is closed 【发布时间】:2020-07-23 07:49:25 【问题描述】:我有一个 Xamarin ios 应用程序,它每 10 秒获取一次用户位置,即使应用程序被终止也是如此。我让我们使用这个库:“https://jamesmontemagno.github.io/GeolocatorPlugin/”。
我想要的是:当应用程序关闭或打开并且用户位于特定位置时,我想显示本地通知。当应用程序关闭时,这甚至可能吗?我找不到这方面的信息,因为它总是关于远程通知。
【问题讨论】:
【参考方案1】:应在应用启动后立即通过将以下代码添加到AppDelegate
的FinishedLaunching
方法并设置所需的通知类型(UNAuthorizationOptions
)来请求通知权限:
...
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 的新增功能,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
,应用程序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。您可以在上传位置后添加此行。
我的demo已经上传到我的github了,大家可以下载参考:Demo Link.
您可以访问链接以获取更多信息和详细信息:MicroSoft Document
【讨论】:
当应用关闭时,通知被标签时是否会触发 DidReceiveNotificationResponse? 是的,点击通知就会被调用以上是关于Xamarin IOS - 应用程序关闭时显示本地通知的主要内容,如果未能解决你的问题,请参考以下文章
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