Today I tried to work on an older application and got this message:
“This version of Interface Builder does not support documents of type “Interface Builder Cocoa Touch Document (XIB 3.x)” targeting “iPhone/iPod touch”.”
I never had that before and just can imagine it happened after I updated yesterday my System to OS X Lion.
What could I do now? It looks I can’t edit any of my older applications? How would I update the xib Files so they work with Lion?
Try updating Xcode to 4.1. I suspect Apple wouldn’t just kill support for 3.* projects.