How to clean project before each build?

Question

Is there a way (possibly using schemes) in Xcode to specify that a clean is automatically done before doing a new build.?

I have a project that sometimes fails to bu

Answer 1

Press ⌥⌘R, expand the selected scheme, select Pre-actions, click +, select New Run Script Action, set Provide Build Settings from to your target. In the box below type rm -rf ${BUILT_PRODUCTS_DIR}. Note: it is BUILT not BUILD as seen in the Xcode dialog. You can type echo ${BUILT_PRODUCTS_DIR} > ~/Desktop/log.txt to see what's going to be deleted.