iOS 真机测试的时候报错 After modifying system headers, please delete the module cache at '/ /Users/smile/Libr

这个是Xcode缓存导致的

fatal error: file '

'/
/Users/smile/Library/Developer/Xcode/DerivedData/ModuleCache/VE5HTVL861UA' was built 
note: after modifying system headers, please delete the module cache at '/Users/ligang/Library/Developer/Xcode/DerivedData/ModuleCache/1O5WP9283VGUA' 
1 error generated.

 解决方法:点击Xcode-》window->organizer 删除缓存

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