我在我的应用程序中使用推送通知服务。当应用程序在后台时,我能够在通知屏幕上看到通知(当我们从iOS设备顶部向下滑动时显示的屏幕)。但如果应用程序是在前台的委托方法

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo

正在被调用,但通知屏幕上没有显示通知。

我想在通知屏幕上显示通知,不管应用程序是在后台还是前台。我厌倦了寻找解决办法。任何帮助都非常感激。


当前回答

添加completionHandler行委托方法为我解决了同样的问题:

//Called when a notification is delivered to a foreground app.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

completionHandler([.alert, .badge, .sound])
} 

其他回答

如果应用程序在前台运行,iOS不会显示通知横幅/警报。这是故意的。但我们可以通过使用UILocalNotification实现它,如下所示

Check whether application is in active state on receiving a remote notification. If in active state fire a UILocalNotification. if (application.applicationState == UIApplicationStateActive ) { UILocalNotification *localNotification = [[UILocalNotification alloc] init]; localNotification.userInfo = userInfo; localNotification.soundName = UILocalNotificationDefaultSoundName; localNotification.alertBody = message; localNotification.fireDate = [NSDate date]; [[UIApplication sharedApplication] scheduleLocalNotification:localNotification]; }

迅速:

if application.applicationState == .active {
    var localNotification = UILocalNotification()
    localNotification.userInfo = userInfo
    localNotification.soundName = UILocalNotificationDefaultSoundName
    localNotification.alertBody = message
    localNotification.fireDate = Date()
    UIApplication.shared.scheduleLocalNotification(localNotification)
}

当应用程序在前台显示横幅消息时,使用以下方法。

iOS 10, Swift 3/4:

// This method will be called when app received push notifications in foreground
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) 
{
    completionHandler([.alert, .badge, .sound])
}

iOS 10, Swift 2.3:

@available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
{
    //Handle the notification
    completionHandler(
       [UNNotificationPresentationOptions.Alert,
        UNNotificationPresentationOptions.Sound,
        UNNotificationPresentationOptions.Badge])
}

你还必须将你的应用委托注册为通知中心的委托:

import UserNotifications

// snip!

class AppDelegate : UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate

// snip!

   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

      // set the delegate in didFinishLaunchingWithOptions
      UNUserNotificationCenter.current().delegate = self
      ...
   }

Swift 5

1)使用UNUserNotificationCenterDelegate确认委托到AppDelegate 2)在didFinishLaunch中UNUserNotificationCenter.current().delegate = self 3)在AppDelegate中实现如下方法。

func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
     print("Push notification received in foreground.")
     completionHandler([.alert, .sound, .badge])
}

就是这样!

对于任何可能感兴趣的人来说,我最终创建了一个自定义视图,看起来像顶部的系统推送横幅,但添加了一个关闭按钮(小蓝色X)和一个点击消息进行自定义操作的选项。它还支持在用户有时间阅读/删除旧通知之前到达多个通知的情况(没有限制可以堆积多少…)

链接到GitHub: AGPushNote

用法基本上是在线的:

[AGPushNoteView showWithNotificationMessage:@"John Doe sent you a message!"];

在iOS7上看起来是这样的(iOS6有一个iOS6的外观和感觉…)

添加completionHandler行委托方法为我解决了同样的问题:

//Called when a notification is delivered to a foreground app.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

completionHandler([.alert, .badge, .sound])
}