报错：file ‘/Applications/Xcode 2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIImageView.h‘ has been modified since the precompiled header ‘/Users/developer/Library/Developer/Xcode/DerivedData/ModuleCache/33Y36HUZG2E74/UIKit.pcm‘
was built
原因：我在系统的库文件里面进行了操作造成的。
解决办法：/Users/developer/Library/Developer/Xcode/DerivedData/ModuleCache/33Y36HUZG2E74进入到这个里面，把UIKit.pcm删除
或者直接删除：
在xcode系统的库文件里面进行了操作造成的bug
原文：http://blog.csdn.net/u010241322/article/details/44596063
