Gcc 不包括 Object.h

Question

我刚刚开始用 gcc 做 Objective-C（到目前为止我只使用了 XCode）。

#include <objc/Object.h>  
@interface Integer : Object  
{  
int integer;  
}  
- (int) integer;  
-(id) integer: (int) _integer;  
@end

#import "Integer.h"  
@implementation Integer  
- (int) integer  
{  
    return integer;  
}  
- (id) integer: (int) _integer  
{  
    integer = _integer;  
}  
@end

一旦我尝试编译这些内容，我就会得到以下信息：

main.m: In function ‘main’:  
main.m:8: warning: ‘Integer’ may not respond to ‘+new’  
main.m:8: warning: (Messages without a matching method signature  
main.m:8: warning: will be assumed to return ‘id’ and accept  
main.m:8: warning: ‘...’ as arguments.)  
main.m:8: warning: ‘Integer’ may not respond to ‘+new’

在我看来，包含 Object.h 并不太有效。 我在包含文件中搜索了 Object.h 并得到了以下信息：

find /usr/include/ -name Object.h   
/usr/include//objc/Object.h

GCC 输出也暗示编译器实际上正在该路径中搜索。

 #include "..." search starts here:  
 #include <...> search starts here:  
 /usr/local/include  
 /usr/lib/gcc/i686-apple-darwin10/4.2.1/include  
 /usr/include  
 /System/Library/Frameworks (framework directory)  
 /Library/Frameworks (framework directory)  
End of search list.  
GNU Objective-C version 4.2.1 (Apple Inc. build 5664) (i686-apple-darwin10)
        compiled by GNU C version 4.2.1 (Apple Inc. build 5664).  
GGC heuristics: --param ggc-min-expand=150 --param ggc-min-heapsize=131072  
Compiler executable checksum: 84137cc00ce86c64ee80a91a006f61ae  
main.m: In function ‘main’:  
main.m:8: warning: ‘Integer’ may not respond to ‘+new’  
main.m:8: warning: (Messages without a matching method signature  
main.m:8: warning: will be assumed to return ‘id’ and accept  
main.m:8: warning: ‘...’ as arguments.)  
main.m:8: warning: ‘Integer’ may not respond to ‘+new’`\

我在忽略什么？

Answer 1

如果 gcc 找不到 Object.h，它会给出一个错误指示。问题在于 Apple 在 Objective-C 2.0 中删除了 Object 中的大部分方法（或者至少是它的接口）。相反，您应该子类化 NSObject 并包含 Foundation 框架。

Answer 2

如何将第一行更改为

#include <objc/Object>