iOS中遇到Unkown type name NSString Unkown type name CGFloat
这里定义的是C的类型数据。直接在文件中加入#import <UIKit/UIKit.h>解决
I had the same issue on my project when I was trying to mix C code (.h and .c) with Objective-C code. Found the reason of the issue:
Check your .pch file to make sure every Objective-C framework #import (such as #import <UIKit/UIKit.h>
) is enclosed in:
#ifdef __OBJC__
#endif
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