Posted when the app enters the background.
SDKs
Framework
class let didEnterBackgroundNotification: NSNotification.Name
The object of the notification is the UIApplication object. There is no user dictionary.
func applicationTells the delegate that the app has become active.
func applicationTells the delegate that the app is about to become inactive.
func applicationTells the delegate that the app is now in the background.
func applicationTells the delegate that the app is about to enter the foreground.
func applicationTells the delegate when the app is about to terminate.
class let didPosted when the app becomes active.
class let willPosted shortly before an app leaves the background state on its way to becoming the active app.
class let willPosted when the app is no longer active and loses focus.
class let willPosted when the app is about to terminate.