Xcode shows old, deleted xib files

Just modify your XIB files a bit, then save them, xCode will detect a modification (last modified date in the file system) then load the xib from its actual path, and not from a cache-path :P

just clean the build using

Product -> Clean

menu.

Try deleting the app from the simulator (hold down on the app's icon to get to jiggle mode, then click the X by the app) and from your device. Then let Xcode reinstall it.