Learn Objective-C on Ubuntu

以你之姓@ 2022-01-17 06:15 129阅读 0赞

Objective-C is used primarily on Mac OSX and GNUStep. If you want to learn it without Mac, you can install GNUStep on Ubuntu.  
  
make sure/test GNUStep installed on your Ubuntu(8.04).  
  
add script to your .bashrc file

\#set GNUstep  
GNUSTEP\_ROOT=/usr/share/GNUstep  
export GNUSTEP\_ROOT  
source /usr/share/GNUstep/Makefiles/GNUstep.sh

Try your first Objective-C code,

>mkdir test

create source code called

`source.m`

under test dir

\#include <stdio.h>  
  
/\*  
\* The next \#include line is generally present in all Objective-C  
\* source files that use GNUstep. The Foundation.h header file  
\* includes all the other standard header files you need.  
\*/  
\#include <Foundation/Foundation.h>  
  
/\*  
\* Declare the Test class that implements the class method (classStringValue).  
\*/  
@interface Test  
\+ (const char \*) classStringValue;  
@end  
  
/\*  
\* Define the Test class and the class method (classStringValue).  
\*/  
@implementation Test  
\+ (const char \*) classStringValue;  
\{  
return "This is the string value of the Test class";  
\}  
@end  
  
/\*  
\* The main() function: pass a message to the Test class  
\* and print the returned string.  
\*/  
int main(void)  
\{  
printf("%s\\n", \[Test classStringValue\]);  
return 0;  
\}

create filename GNUmakefile with code like

include $(GNUSTEP\_MAKEFILES)/common.make  
  
TOOL\_NAME = LogTest  
LogTest\_OBJC\_FILES = source.m  
  
include $(GNUSTEP\_MAKEFILES)/tool.make

compile with type command **make**  
  
run the program with command **./obj/LogTest**  
  
got message:  
"This is the string value of the Test class"

本文为转载，原博文地址：[http://speedooo.blog.51cto.com/226772/74919][http_speedooo.blog.51cto.com_226772_74919]

转载于:https://blog.51cto.com/his9932/605374

[http_speedooo.blog.51cto.com_226772_74919]: http://speedooo.blog.51cto.com/226772/74919