ios - Change appdelegate methods from SDK -

hi all.

i'm trying develop sdk register on events when app going background [like background fetch or significant location change]. reason need write code in appdelegate methods

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions 

and:

- (void)applicationdidenterbackground:(uiapplication *)application 

the question is, how can without damaging hosting app app delegate.

i tried categorizing, in order need know appdelegate

i read bit methods swizzling can't figure out how change appdelegate method , not run over.

if can give example sample code or link clear things out appreciated.

thanks.

you can use 2 notifications:

uiapplicationdidfinishlaunchingnotification uiapplicationdidenterbackgroundnotification 

you can read more them here: https://developer.apple.com/library/ios/documentation/uikit/reference/uiapplication_class/#//apple_ref/c/data/uiapplicationdidfinishlaunchingnotification