iphone - How to stop the Observer in NSNotification to called twice? -

i have observer of nsnotification called twice. not know it.

i googled no solution found.

[[nsnotificationcenter defaultcenter] addobserver:self      selector:@selector(connectedtoserver:) name:@"connectedtoserver" object:nil];  - (void)connectedtoserver:(nsnotification*)notification {      [[nsnotificationcenter defaultcenter] postnotificationname:@"sendmessagetoserver" object:message]; } 

solution 1: first thing check if notification posted twice.

solution 2: if notification posted once, action called many times you've added observer notification (no matter notification same or not). example, following 2 lines register observer(self) same notification(aselector) twice.

[[nsnotificationcenter defaultcenter] addobserver:self selector:aselector name:aname object:nil]; [[nsnotificationcenter defaultcenter] addobserver:self selector:aselector name:aname object:nil]; 

you have find adding observer second time, , remove it. , make sure code add observer not called twice.

solution 3: if not sure whether have added observer or not, can following. make sure observer added once.

[[nsnotificationcenter defaultcenter] removeobserver:self name:aname object:nil]; [[nsnotificationcenter defaultcenter] addobserver:self selector:aselector name:aname object:nil];