Xcode可以告诉我是否忘记在目标中包含类别实现吗? [英] Can Xcode tell me if I forget to include a category implementation in my target?

问题描述

我有一个要导入.m的类别:

I have a category that I import in a .m thusly:

#import "UIView+Additions.h"

如果我忘记将 UIView + Additions.m 添加到目标中，那么直到运行时找不到运行选择器时，我才知道.有没有一种方法可以在编译时(或者可能在链接时)找出我忘记包含类别的实现的方法?

If I forget to add UIView+Additions.m to my target, I won't know until runtime when the runtime can't find my selector. Is there a way to find out at compile time (or probably link time) that I forgot to include a category's implemtation?

推荐答案

此宏有效！

#ifndef HJBObjCCategory_h
#define HJBObjCCategory_h

#define HJBObjCCategoryInterface( c , n ) \
\
extern int c##n##Canary; \
\
__attribute__((constructor)) static void c##n##CanaryCage() { \
    c##n##Canary = 0; \
} \
\
@interface c (n)

#define HJBObjCCategoryImplementation( c , n ) \
\
int c##n##Canary = 0; \
\
@implementation c ( n )

#endif

像这样使用它:

UIView + Additions.h

HJBObjCCategoryInterface(UIView, Additions)

- (void)hjb_foo;

@end

UIView + Additions.m

HJBObjCCategoryImplementation(UIView, Additions)

- (void)hjb_foo {
  NSLog(@"foo!");
}

@end

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