本文转载自 IOS开发xcode报错之has been modified since the precompiled header was built
其实我是升级xcode到4.6.3的时候遇到的一个也是has been modified since the precompiled header was built的问题，看一下 是clean一下就好了
今天做百度地图的时候第一次发现下面错误：
问题：Apple LLVM compiler 3.0 error file "BMKPointAnnotation.h" has been modified since the precompiled header was built
(原因：预编译头的时候文件被修改)；
解决方法：1.Select Product > Clean from the Xcode menu
2.
快捷键shift+command+k；clean一下