How to Empty Caches and Clean All Targets Xcode 4 and later

Question

Jonathan suggest here: Xcode Includes .xib files that have been deleted! that cleaning all targets and empty the caches will fix the problem with Xcode including deleted .xi

Answer 1

To delete all derived data and the module cache in /var/folders use this little ruby script.

derivedDataFolder = Dir.glob(Dir.home + "/Library/Developer/Xcode/DerivedData/*")
moduleCache = Dir.glob("/var/folders/**/com.apple.DeveloperTools*")
FileUtils.rm_rf derivedDataFolder + moduleCache

This just solved a fatal error: malformed or corrupted AST file: 'Unable to load module "/var/folders/ error for me.