How to do some work when push notification arrives? - ios

Question

I have an application, I got the push notifications, but I would like to do that if the device got a push notification my application do some work in the background without user interaction.
Now I can do some work if the user tap on the notification, but it's not enough efficient for me.

Answer 1

1. In Info.plist set UIBackgroundModes to remote-notification
<key>UIBackgroundModes</key>
<array>
<string>remote-notification</string>
</array>
2. You need to implement following method in ApplicationDelegate
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))handler
{
//Success
handler(UIBackgroundFetchResultNewData);
}
3. Send Push notification with content-available: 1 so it will work like silent
aps {
content-available: 1
alert: {...}
}

Answer 2

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject])
{
if (state == UIApplicationState.Background || state == UIApplicationState.Inactive)
{
// Your Logic
}
}
// Write this method in AppDelegate.h or AppDelegate.swift File.

Answer 3

When your push notification arrives, you can do some additional background work on didReceiveRemoteNotification delegate.
On your appDelegate.m file, add below application delegate method with dispatch_async code to run additional background execution.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo{
//Background execution block
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
//Do some work if the user tap on the notification
});
}