Category分類

Student.h:

#import <Foundation/Foundation.h>  @interface Student : NSObject  @property(nonatomic) int no; -(void)TestStudent; @end

Student.m:

#import "Student.h"  @implementation Student -(void)TestStudent{     NSLog(@" Student "); } @end

Student+Test.h

#import "Student.h" //()  //Test  @interface Student (Test) // ： ，  -(void) Test2; @end @interface Student(Addtion) -(void) Test3; @end

Student+Test.m:

#import "Student+Test.h"  @implementation Student (Test) -(void)Test2 {     NSLog(@" Test2"); } @end @implementation Student(Addtion) -(void)Test3{     NSLog(@" test3"); } @end

NSString+JSON.h:

#import <Foundation/Foundation.h>  @interface NSString (JSON) +(NSString *)json; @end

NSString+JSON.m:

#import "NSString+JSON.h"  @implementation NSString (JSON) +(NSString *)json{     return @"{'name':'dxw','id':10}"; } @end

main:

#import <Foundation/Foundation.h> #import "Student.h" #import "Student+Test.h" #import "NSString+JSON.h"  int main(int argc, const char * argv[]) {      @autoreleasepool {                  Student *stu=[[[Student alloc] init] autorelease];         [stu TestStudent];         [stu Test2];         [stu Test3];         NSLog(@"%@",[NSString json]);     }     return 0; }

結果:
2013-08-02 15:47:57.364 Category[1322:303]Studentをテストする方法です
2013-08-02 15:47:57.366 Category[1322:303]分類方法Test 2です
2013-08-02 15:47:57.367 Category[1322:303]分類方法test 3です
2013-08-02 15:47:57.368 Category[1322:303] {'name':'dxw','id':10}