Question

I m new to the iOS. When i press home button in iPhone, application goes into suspend mode is what i know, in the program, how can i capture this event, and clear my local datas?
Kindly advice.

Answer 1

While you can implement the UIApplicationDelegate methods discussed by others, it is often more convenient (and arguably cleaner) to have objects that need to do clean up register themselves for the corresponding notifications:

UIApplicationDidEnterBackgroundNotification
UIApplicationWillResignActiveNotification

E.g.

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

(If you go this route, don’t forget to remove the observer when the observing object is deallocated.)