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 built
系统头文件被修改过了来到/Users/kolnick/Library/Developer/Xcode/DerivedData/
1.打开finder 进入系统头文件
2.将ModuleCache 删除 再clean 下项目 重新编译