You have been able to deliver push notifications to your app after reading Recipe 17.8 but don’t know how to react to them in your app.
method of your app delegate.
method of your app delegate gets called whenever a push notification is
delivered to iOS and the user acts upon it in a way that opens your app.
This method gets called if your app is either in the foreground or the
background, but not completely terminated. For instance, the user can
ignore the push notification. In that case, the aforementioned method
will not get called. If the user presses the push notification, which in
turn opens your app, iOS will open your app and bring it to the
foreground, after which the aforementioned method will get called on
your app delegate.
If your app is fully terminated and not in the background,
the push notification that triggers your app to wake up will be
encapsulated by iOS in the launch options that will be passed to the
method of your app delegate. To retrieve the notification object, simply
didFinishLaunchingWithOptions parameter of
this method (which is of type
NSDictionary) and look for the
key. The value of this key will be the push notification object that
started your app.
didReceiveRemoteNotification parameter ...