Category分类

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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(@"我是测试Student的方法");}@end

Student+Test.h

#import "Student.h"//()分类文件方法//Test是分类的方法名@interface Student (Test)//注意：只能扩展方法，不能添加成员变量-(void) Test2;@end@interface Student(Addtion)-(void) Test3;@end

Student+Test.m:

#import "Student+Test.h"@implementation Student (Test)-(void)Test2{    NSLog(@"我是分类方法Test2");}@end@implementation Student(Addtion)-(void)Test3{    NSLog(@"我是分类方法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;}

结果：

2013-08-02 15:47:57.364 Category[1322:303] 我是测试Student的方法

2013-08-02 15:47:57.366 Category[1322:303] 我是分类方法Test2

2013-08-02 15:47:57.367 Category[1322:303] 我是分类方法test3

2013-08-02 15:47:57.368 Category[1322:303] {'name':'dxw','id':10}