ios - view controller segue connections for multiple view controller interconnection -

working on application contains 3 view controllers a,b , c. can navigate view controller 1 view controller. a->b, a->c, b->a, b->a, c->a, c->b using storyboard segue type show each transition. while analysis came know view controller old instance not release , new instance created each navigation. while using button event dismissing current view controller [self dismissviewcontrolleranimated:yes completion:nil]; navigation instance released. cant used case, need switch view controller , release current view controller. suggest segue connection used such release of view controller should done? or other methods achieve should not affect performance. struggling different analysis since retain count increase new transition view controllers, analysed allocation tool. right present view controllers , dismissviewocontroller completion?