Update PSStackedViewController.m
Update PSStackedViewController.m

Issue with 64-bit architecture. It affects expand/collapse functionality.
Anish-kumar-dev/PSStackedView,steipete/PSStackedView,zuoguoqing/PSStackedView,zuoguoqing/PSStackedView,SuPair/PSStackedView,SuPair/PSStackedView,steipete/PSStackedView,fabb/PSStackedView