How to access applicationDidEnterBackground from viewController

Question

How can I call applicationDidEnterBackground that in AppDelegate from a viewController?

I want to run a function in the background of the app without pressing home button.

Answer 1

You are not supposed to call that function from anywhere. It is there to let you know when the app enters the background.

Do you simply want to know when the app enters the background? If so, then you can create a notification to help you with that:

[[NSNotificationCenter defaultCenter] addObserver: self
                                         selector: @selector(handleEnteredBackground:) 
                                             name: UIApplicationDidEnterBackgroundNotification
                                           object: nil];