What can we use instead of nstimer?

问题:

I can get the GPS location in the background using [locationManager startUpdatingLocation], but I don't know how to schedule it. I have used NSTimer for scheduling but many of them are saying that NSTimer will get expire if the application enters background.

I want to know how to schedule calling the method , if we are not using NSTimers.

回答1:

Apple provides 5 kinds of app task to run in background:

• 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

Refer this link for location updates while app is in background

Also refer this tutorial for further help

回答2:

We can use Push Notification instead of NSTimer for scheduling as shown:-

http://developer.apple.com/iphone/library/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Introduction/Introduction.html

Hope it helps.Thanks :)

回答3:

I think you can use this :

[self performSelector:@selector(_yourMethod) withObject:nil afterDelay:delay_in_milliseconds];