couldnotbuildmodule‘Foundation’,couldnotbuildmodule‘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>