I am trying to receive a notification in the background to process information in my App when it is in Foreground, Background or Closed. I don't want to receive the Alert.
I have tried to do it without placing the Title and Body at the time of shipment, only Custom Data.
How could I receive this information without using an alert, regardless of the status of the App?
A silent push notification or some might call it background notification is a notification that does not trigger any alert or sound. It wakes up your app and allows you to perform any non-UI related operations in the background.
Sample payload for a background notification:
{ "aps" : { "content-available" : 1 }, "acme1" : "bar","acme2" : 42 }
You need to add “Background Modes” and “Push Notifications” capabilities in Xcode in order for your app to be able to receive a silent push notification.
Points to note:
You can only test push notifications in a real iOS device. iOS
simulator will not be able to receive any push notifications.
The background operation triggered by a silent push notification
will have roughly 30 seconds of execution time.
Silent push notifications will not work when the device is in Low
Data Mode.
Apple guideline for this topic to refer in more details.
Related
I'm implementing the new background push notification system with:
apn-push-type=background
apns-priority=5
in the request header.
If I close the app the notification is delivered and the device doesn't throttle it (as per documentatiuon we can use few of this push or the device throttle them not forwarding them to the app).
If i force quit the app the app awakens and process the push notification.
After a reboot the notification is throttled and there is no way to make the app receive it. Is there something more I should add to my notification payload or header?
Currently the payload is like
{
"aps":{
"content-available": 1
}
... // other data which the app process
}
I need to execute code when my iOS app receives a notification, without involving any user interaction.
if the notification is a silent (i.e. non alert) notification DidReceiveRemoteNotification() does fire in both background and foreground modes.
However, silent notifications are relatively low priority and delivery is not even guaranteed, so this is not a viable option for us; we need to use alert notifications.
If the notification is an alert notification, DidReceiveRemoteNotification() does fire when the app is in foreground mode. However, it does not fire in background mode.
How can I execute code in response to an alert notification, in background mode, without involving user interaction. Is this even possible?
Thanks.
You can combine both silent notification and alert notification on one JSON.
by adding "content-available" : 1 as following :-
{
"aps" : {
"alert" : "Notification Title",
"content-available" : 1
}
}
This will show the alert notification as well as wake the APP to do work on background.
We are trying to achieve a notification feature similar to WhatsApp(iOS version) notification handling, even after killing WhatsApp explicitly- notification message appears on top chat with new message with message count – This can be achieved thru VOIP Push.
Would like to understand whether financial App can use VOIP and whether this will not cause a rejection of the app.
Your app will get rejected with the reason as,
2.16: Multitasking apps may only use background services for their intended purposes: VoIP, audio playback, location, task completion, local notifications, etc.
We found that your app uses a background mode but does not include functionality that requires that mode to run persistently.
Your app has to support VOIP if you intend to use VOIP push.
Note that if you just want to show badge count without showing notification, then it can be achieved through silent notification.
iOS shows badge count irrespective of application running state, i.e. even if your app is explicitly killed, on receive of silent notification, badge count will be reflected. Note that, app is not waken up if it is killed.
Your payload should be,
{
"aps" :
{ "content-available" : 1
"badge" : 5
}
}
Check out some good tutorials on Silent Push Notifications
https://blog.layer.com/how-we-leverage-ios-push-notifications/
https://www.raywenderlich.com/123862/push-notifications-tutorial
I have a problem. When my App is Terminated by the user, push notifications are not detected by the application. The push notification is sent with content_available = true.
What should I do?
This is default system behaviour. If you Application is terminated by the user (from the App switcher), Silent Push Notifications (content_available = true) will not wake the Application, i.e. Application:didreceiveremotenotification will not be called.
If you want the user to be notified, do not send a Silent Push Notification. Send a normal push notification which will show up in the user's notification tray.
That is the way how it works on iOS.
If you app is not running at all, your app receive no push notifications at all. Only if the user swipe over one of your push notifications on the lock screen or the notification center your app will be started and you will be notified that your app was started because of the push message.
If you app is in the background, you actually can handle push notifications by enabling "run in background" support.
I'm talking iOS9 and earlier here. Not sure if the behaviour has been changed in iOS10. But if you are coming from Android then you have to accept that push notification handling works completely different on iOS than on Android.
Sending the notification with the content_available as disabled. content_available = 0
The content_available field is used for sending silent push notifications to process in the background and will not display as a notification.
See documentation : https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/TheNotificationPayload.html#//apple_ref/doc/uid/TP40008194-CH107-SW6
Hope this helps,
DT
Make sure that in your push notification payload you are adding priority:"high". It will ensure that your app will receive a Push Notification in background or closed mode.
{
"to" : "/topics/{userId}"
"content_available":true,
"priority":"high"
"notification" : {
"title": "",
"body":""
},
"data" : {
//custom key value pairs
}
}
I want to clear my local notification in notification tray. For this to be
implemented, I am thinking to use the silent push notification. So I want
to confirm when the device receives it and which things I can do with it?
They can be used to inform the application of new content without having the user informed. Instead of displaying a notification alert, the application will be awakened in background (iOS does not automatically launch your app if the user has force-quit it) and application:didReceiveRemoteNotification:fetchCompletionHandler: will be called. You then have the opportunity to process any information transparently for the user :
Download some content
Synchronize some elements,
Inform the user directly within the application when he opens it back
Note that your time is limited to 30s.
To configure silent notifications
To support silent remote notifications, add the remote-notification value to the UIBackgroundModes array in your Info.plist file. To learn more about this array, see UIBackgroundModes.
<key>UIBackgroundModes</key>
<array>
<string>remote-notification</string>
</array>
Configuring a Silent Notification
The aps dictionary can also contain the content-available property. The content- available property with a value of 1 lets the remote notification act as a silent notification. When a silent notification arrives, iOS wakes up your app in the background so that you can get new data from your server or do background information processing. Users aren’t told about the new or changed information that results from a silent notification, but they can find out about it the next time they open your app.
For a silent notification, take care to ensure there is no alert, sound, or badge payload in the aps dictionary. If you don’t follow this guidance, the incorrectly-configured notification might be throttled and not delivered to the app in the background, and instead of being silent is displayed to the user
When you send a silent push notification and if app is suspended then the system wakes up or launches your app and puts it into the background running state before calling the method but if the app is killed by user manually then it will not wakeup.
application:didReceiveRemoteNotification:fetchCompletionHandler:
This method is called when you send a silent push notification and your app has up to 30 seconds of wall-clock time to perform the download or any other kind of operation and call the specified completion handler block. If the handler is not called in time, your app will be suspended.
If you want to send a silent push notification then your notification payload should be like this :
{
"aps" = {
"content-available" : 1,
"sound" : ""
};
// You can add custom key-value pair here...
}