Oleg Fedorov Oleg Fedorov - 1 year ago 200
iOS Question

Does iOS start app in background after reboot if remote-notification defined in UIBackgroundModes and new push notification comes?

I have an iOS7 app which registers for background mode remote-notification:


It works fine before reboot and app gets this event while in background:

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

But it looks like after reboot I don't get this event anymore until I start application manually.

So, question is: can I make iOS7 to run my app into background after reboot when it receives silent push notification for my app?
My push notifications don't have "alert" field, only "contentAvailable" - can this be a reason?
I've seen apps like whatsapp being able to receive and show push notifications immediately after reboot so it looks doable for at least "alert" kind of notifications.

I know that I can use significant location monitoring to restart app at some point after reboot but I would like to avoid showing location icon on toolbar all the time. Can background-fetch mode help with that?
Is there any statistics, how fast after reboot app with background fetch mode will be executed?

Answer Source

No, It won't work. Because your app will be in Not Running state as you rebooted your device.

As per apple doc, the new multitasking API(fetch and remote-notification) will work only when the app in the suspended/background/foreground state. If the app is in background/foreground state, then application:didReceiveRemoteNotification:fetchCompletionHandler will get triggered. If the app is in suspended state, then -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions will get triggered. In your case the app is in Not Running state, because of that application:didReceiveRemoteNotification:fetchCompletionHandler is never get triggered.

Please refer apple doc for more about app states.

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