Question

I accidentally removed app delegate.m and .h file from the folder of the app.

Then in xcode I could see the name (Appdelegate.h and .m) but with no content.

I found the files in the trash and I dragged and dropped them in the xcode and now I see doubles of both files.

If i try to run my project I keep getting this error:

duplicate symbol _OBJC_IVAR_$_AppDelegate._window in:

If I remove the one of the two duplicates, both are being deleted.

Answer 1

Make sure delegate.m is only listed once within the Compile-Sources.

To get that done; tap on your project on the left top within the project navigator, tap on the target, select Build Phases, expand Compile Source and now check if delegate.m is in there only once.