Clean your project using CommandShiftK and with OptionCommandShiftK.
You can also clear your Derived Data from Finder by going to ~/Library/Developer/Xcode/DerivedData
and deleting the folder for the project (don't worry, this doesn't cause any issues!). To paste that directory in finder, you can use CommandShiftG.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…