今天编译遇到个问题：如下
fatal error: file '/Applications/Xcode 2.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIFontDescriptor.h' has been modified since the precompiled header '/Users/m/Library/Developer/Xcode/DerivedData/ModuleCache/24CDWDK5BTYJE/UIKit.pcm' was built

note: after modifying system headers, please delete the module cache at '/Users/m/Library/Developer/Xcode/DerivedData/ModuleCache/24CDWDK5BTYJE'

1 error generated.






解决办法：


进入相应目录删除那个pcm文件：

rm "/Users/m/Library/Developer/Xcode/DerivedData/ModuleCache/24CDWDK5BTYJE/UIKit.pcm"


然后

Clean Project( Cmd+Shift+K)

清除一下工程，重新编译，问题得到解决。

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