Question

I would like to call a function after every half an hour in background.

Description : I have called a function in
- (void)applicationDidEnterBackground:(UIApplication *)application method. I need to repeat that function after every half an hour.Kindly help me to do this. Let me know if you need any details.

Answer 1

you can’t run any function when your app is in background until your app supports these –

Apps that play audible content to the user while in the background, such as a music player app

Apps that keep users informed of their location at all times, such as a navigation app

Apps that support Voice over Internet Protocol (VoIP)

Newsstand apps that need to download and process new content

Apps that receive regular updates from external accessories

for more details what you can do in background and how, visit –

http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html