could not build module ‘Foundation’, could not build module ‘UIKit’……23个错误

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>

 

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