iOS 导入MKNetworkKit 报错

Question

/Users/abc/Desktop/PROJECTS/MusicPro/MusicPlayer/MusicPlayer-Bridging-Header.h:11:9: note: in file included from /Users/abc/Desktop/PROJECTS/MusicPro/MusicPlayer/MusicPlayer-Bridging-Header.h:11:

import "MKNetworkKit.h"

    ^

/Users/abc/Desktop/PROJECTS/MusicPro/MusicPlayer/MKNetworkKit/MKNetworkKit.h:30:2: error: "MKNetworkKit uses features only available in iOS SDK 4.0 and later."

error "MKNetworkKit uses features only available in iOS SDK 4.0 and later."

^
<unknown>:0: error: failed to import bridging header '/Users/abc/Desktop/PROJECTS/MusicPro/MusicPlayer/MusicPlayer-Bridging-Header.h'

书上说，对于swift项目，设置pch文件不起作用，但是看网上各种oc项目，好像都是通过创建pch文件来解决。。。不知咋弄。。。
下面是报错的MKNetworkKit.h的部分：

#ifndef __IPHONE_4_0
#error "MKNetworkKit uses features only available in iOS SDK 4.0 and later."
#endif

PS。其他正常，框架中的类型可以被swift模块识别

Answer 1

__IPHONE_4_0 是 Foundation 里的东西，要么去掉，要么增加：

#define __IPHONE_4_0 40000