解决 xx.h has been modified since the precompiled header 系统头文件被修改

fatal error: file '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h' has been modified since the precompiled header '/Users/kolnick/Library/Developer/Xcode/DerivedData/OCPLUS-deymfudtmdukfobfxwioeksuwgba/Build/Intermediates/PrecompiledHeaders/OCPLUS-Prefix-eywbgfpbrqealjbqvtcurkuxvctc/OCPLUS-Prefix.pch.pch' was builtfatal error: file '/Applications/Xcode.app/Cont