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pch文件加入
#import <Availability.h>
#ifndef __IPHONE_3_0
#warning "This project uses features only available in iOS SDK 3.0 and later."
#endif
#ifdef __OBJC__
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
could not build module ‘Foundation’, could not build module ‘UIKit’……23个错误
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原文地址：http://www.cnblogs.com/thelatewind/p/4699622.html
