iphone - how to get back in navigation view using timer -

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hi using code getting previous view 

nstimer *thetimer = [nstimer scheduledtimerwithtimeinterval:3.0                                                   target:self                                                  selector:@selector(picturetimerfired:)                                                  userinfo:nil                                                  repeats:no];  - (void) picturetimerfired:(nstimer*)thetimer {  nslog(@"timer fired, closing picture"); }

but happened directly quit application , displays icon how can resolve

remove comma function name because if not passing argument timer no need comma , if passing argument use uersinfo @ function


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