September 26th, 2013
Xcode 5 introduces a new xib file format that works better with version control. New Xcode 5 projects use the new file format. If you have an existing project, selecting the xib file from the project navigator should prompt you with an alert asking if you want to upgrade the xib file to the new format. If you don’t get the alert, you can switch to the new file format by opening the xib file’s file inspector and choosing 5.0 from the Opens in menu.
Xib files that use the new file format will not open in Xcode 4. Choose 4.6 from the Opens in menu if you need to open the xib file in Xcode 4.
Tags: xcode 5