Xcode 4 “Clean” vs. “Clean Build Folder”

Question

You come at a certain point in the development of every app that what you see in the simulator does not match what you think should happen. Mostly these are human errors --

Answer 1

Some files at ~/Library/Developer/Xcode/DerivedData/xxx-ABCD, where xxx is the name of your project or workspace, have been deleted after you Clean or Clean Build Folder.... Obviously, Clean Build Folder... will delete more files than Clean will do. However, I think deletion of the folder that I mentioned before is needed in some case, such as your Xcode cannot work properly.

By the way, something has changed for Xcode 8, Build folder is kept all the same after Clean Build Folder...