I have created a new iPhone project in Xcode 4 and added some files (xib and classes) from an old project which was created in Xcode 3 which works fine.
The project compiles fine with no errors or warnings. However, when I try to run it I get the infamous
“NSUnknownKeyException reason: class is not key value coding-compliant for the key dateOutlet” error.
When I opened the XIB file the connection to the dateOutlet seemed just fine, but I deleted and reconnected anyway just to be safe. Next time I ran it I got the same error but on another outlet which made me think that something went wrong with connections and I just needed to reconnect them again. However, I noticed that sometimes when I reconnected an outlet it would fail on an outlet which I had already ìfixedî. After a lot of fiddling I concluded that reconnecting didnít really fix anything, itís just that when I made changes to the xib the next failing outlet would be picked at random (or so it seems at least).
Has anybody experienced this problem? I have googled a lot but none seem to have encountered this exact behaviour. I have tried to run the project on 3 different machines now with the same result.
Ok, I found out the source of the problem. It seems that in the Target for the app the “Main Interface” was set to my MainView which is an instance of UIView. I changed it to MainWindow (generated by Xcode) and all worked fine.