ios - The new changes over a xib files doesnt overwrite the old when I reinstall the app, the old still appear -

i have problem when try update xib existing app.

my app multilingual , uses en_us, es_es , pt_br. when change label, button, view, ... xbi, , afterwards try reinstall (overwrite old app) app, new changes xib don't appear, old data views still appear.

the question is, can fix problem, have speficify flag in infoplist or that?

answering own question , waiting helpful someone.

the problem occurs when make change in xib file , run application on emulator, apparently not replaced new xib files , emulator uses old xib files. (xcode 4.3, ipad/iphone emulator 4.3/5.0)

to solve problem, every time make change in xib files, delete application , run emulator again. when distribute application, need reinstall overwrite old xib files, , in case, database in document directory safe. noticed because when distribute application, works fine.