I'm using the official Dropbox Objective C framework within an Xcode Objective C iOS project. If I clean and rebuild the project, I have no problems running the app. If I then rebuild and run, I get a linker error:
dyld[12193]: Symbol not found: _OBJC_CLASS_$_DBScopeRequest
Referenced from: <A3ABDE7A-6441-3771-9061-F2CC46FEEBF3> /private/var/containers/Bundle/Application/30EC2350-4AE3-4194-9F0C-B5087FEDB042/AppName.app/AppName
Expected in: <163AA2D6-A97B-396E-8300-E44FA89645D8> /private/var/containers/Bundle/Application/30EC2350-4AE3-4194-9F0C-B5087FEDB042/AppName.app/Frameworks/ObjectiveDropboxOfficial.framework/ObjectiveDropboxOfficial
I can then clean and build and run again successfully. So it sort of works, but having to clean and build every single time is very inefficient.
It doesn't seem to be a problem inherent to the Dropbox framework. I've tried the usual debugging steps such as deleting the derived data folder, restarting Xcode, etc.