warning: Missing file: is missing from working copy

本文提供了解决Xcode和SVN版本控制下遇到的问题的步骤：删除仓库、重启Xcode、清除隐藏SVN文件夹。同时，建议始终通过Xcode或SVN客户端进行删除操作，以防止文件丢失或引用错误。

had the same issue, and I just solved it by:

delete the repository in Xcode's Organizer
quit Xcode
delete all .svn hidden folders (also within the *.xcodeproj file)

Hope this works for you as well.

这里需要注意的是要把项目中xcodeproj中的隐藏SVN文件夹也删除掉这样的话就OK了

warning: Missing file: is missing from working copy

fatal error: file '….h' has been modified since the precompiled header was built

的解决办法

http://stackoverflow.com/questions/5897232/how-to-remove-properly-a-file-on-xcode-4-with-svn-version-control

To prevent the error from occurring in the first place, always "Delete" through Xcode, or, through your SVN client (but, if you delete it through your SVN client you'll still have to delete the missing reference in Xcode - so you might as well just delete it in Xcode to being with).

http://stackoverflow.com/questions/7071523/xcode-4-1-fatal-error-stdlib-modified-since-the-precompiled-header-was-built

I had this exact same problem after applying the recent Xcode patch. I ended up deleting the DerivedData folder for my app at:

~/Library/Developer/Xcode/DerivedData/{project name + gobly-gook}

This directory contains built products and indexes for the project. It is OK to delete it because it only contains items generated by Xcode. Xcode will regenerate everything next time the project is opened.

http://blog.youkuaiyun.com/pinklpig/article/details/7670723

http://stackoverflow.com/questions/5897232/how-to-remove-properly-a-file-on-xcode-4-with-svn-version-control