language localization in xib/ib does not work

I am working on the localization of one of my project. The function NSLocalizedString in XCode does work. But when 开发者_高级运维I switch the language setting, it look likes the app does not switch to relevant fr/en/jp file of mainwindow.xib, help.html etc.

Welcome any comment

You need to create a xib file for each localization, put your mainwindow.xib with french text in fr folder, the en version in the en folder etc.

For more information: Interface Builder User Guide: Localization