Xcode升级之后，工程打不开，弹出The file “CoreData” couldn’t be opened because you don’t have permission to view it.
解决办法：找到Project---Build Setting中 修改这一项，变成Default Compiler（Apple LLVM 6.0）
The file “xxx” couldn’t be opened because you don’t have permission to view it.
原文：http://blog.csdn.net/darongzi1314/article/details/46471573