ios - Split View Controller with Multiple Details View - Memory Leak -

i have added 2 view controllers before moving split view controller. in split view controller details controllers changing, memory usage increasing according newly allocated view controller memory usage. but, previous detail view controllers' memory not automatically released arc. in simulator have checked simulated memory warnings, arc never releases unused view controllers' memory. due increasing memory usage app crashes. checked splitviewcontroller.viewcontrollers array , inner array never find out unused details view controllers' instance. have tried @autorelease block. didn't work.

please me out of nightmare.