Update README.md

README.md

@@ -216,7 +216,31 @@ Update the `AndroidManifest.xml` file to set the application class:
 
 Make sure you have correctly configured your app to support push notifications, and that you have generated certificate/token for sending pushes.
 
-To enable offline notification support on iOS a guide will be released soon on our website.
+##### Offline support for push notifications
+
+- open the XCode project
+- create a new target of type `Notification service extension`
+- add `App Groups` capability to the `Runner` target and the just created one
+- add the line `  pod 'StreamChatClient', :git => 'https://github.com/GetStream/stream-chat-swift.git', :branch => 'release/2.0'` to the Podfile
+- run `pod install`
+- substitute the code in the `Notification service` with [this one](https://gist.github.com/imtoori/d37611faefef036e1a6c017b1a09e91f) and substitute APPGROUP with the just created one
+- do the same with `AppDelegate.swift` using [this template](https://gist.github.com/imtoori/f95b30f25b745c5f777bfff1085176ef)
+- set the notification template on your GetStream dashboard to be like this:
+```handlebars
+template = {
+    "aps" : {
+        "alert" : {
+            "title" : "{{ sender.name }} @ {{ channel.name }}",
+            "body" : "{{ message.text }}"
+        },
+        "badge": {{ unread_count }},
+        "apns-priority": 10,
+        "mutable-content" : 1
+    },
+    "message_id": "{{ message.id }}"
+}
+```
+Of course you can change the `alert` object as you want. Just make sure it has the last three lines.
 
 ## Contributing