iphone - removeObserver not working for UIApplicationWillEnterForegroundNotification IOS -

hi developing iphone application in registering uiapplicationwillenterforegroundnotification notification. when tried unregister observer not working. still called. code looks

in viewdidload method registering

  [[nsnotificationcenter defaultcenter]  addobserver:self  selector:@selector(applicationbecomeactive)  name:uiapplicationwillenterforegroundnotification  object:nil]; 

and on logout method tried remove observer

 [[nsnotificationcenter defaultcenter] removeobserver:uiapplicationwillenterforegroundnotification]; 

but not working. doing thing wrong. need help. thank you.

that's because you're not removing observer.

notice add observer method:

[[nsnotificationcenter defaultcenter]  addobserver:self  selector:@selector(applicationbecomeactive)  name:uiapplicationwillenterforegroundnotification  object:nil]; 

the important part addobserver:self

so in order remove observer, do:

[[nsnotificationcenter defaultcenter] removeobserver:self]; 

or if want remove particular notification name:

[[nsnotificationcenter defaultcenter] removeobserver:self         name:uiapplicationwillenterforegroundnotification object:nil];