So open up Xcode and look for some file like App_Prefix.pch, by default it's in the Other Sources group. After the UIKit import statement, add the following line: #import <CoreData/CoreData.h> 需要在 .pch文件中加入 #import <CoreData/CoreData.h>
添加 coredata 出现 is a forward declaration 错误
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转载自zheyiw.iteye.com/blog/1672226
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