TARGET_OS_IPHONE TARGET_IPHONE_SIMULATOR #import 「TargetConditionals.h」

when building for iOS. Consider using #if !TARGET_OS_IPHONE ||TARGET_IPHONE_SIMULATOR to conditionally import this framework, first importing TargetConditionals.h if necessary.

	#if !TARGET_OS_IPHONE ||TARGET_IPHONE_SIMULATOR

    #import <TargetConditionals.h>
    #else
    

之前代碼是將#import <TargetConditionals.h>寫在了 條件 #if !TARGET_OS_IPHONE ||TARGET_IPHONE_SIMULATOR 一運行就報錯了，原因是， TARGET_OS_IPHONE、TARGET_IPHONE_SIMULATOR 這兩個宏是在TargetConditionals.h 文件裏聲明的。所以需要把#import <TargetConditionals.h>寫在條件外面

#import <TargetConditionals.h>
#if !TARGET_OS_IPHONE ||TARGET_IPHONE_SIMULATOR

    
 
 #else