ios - UIButton touch is not respoding in xcode 4.5 in objective c -

ios - UIButton touch is not respoding in xcode 4.5 in objective c -

i have created project in xcode 4.3 development target 5.1. want update app iphone 5. have run code in xcode 4.5, compiled , run of buttons on top , bottom of screen not responding touch event.

don't know issue removed older uibuttons , added new buttons worked me.

ios objective-c ios5 ios6 uibutton