//
//  Animal.h
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#ifndef CategoryProtocol_Animal_h
#define CategoryProtocol_Animal_h

// 定义协议
@protocol Animal <NSObject>

// default is required
@required
-(void)showName;

@optional
-(void)showOptional;
@end


#endif

//
//  Cat+speak.h
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Cat.h"

// 定义分类，注意语法，且只能写方法
@interface Cat (speak)

-(void)speak;

@end

//
//  Cat+speak.m
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#import "Cat+speak.h"

// 实现分类，能直接访问类属性
@implementation Cat (speak)

-(void)speak
{
    NSLog(@"%@ : 喵喵", name);
}
@end

//
//  Cat.h
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Animal.h"

// 类实现协议
@interface Cat : NSObject <Animal>
{
    NSString*   name;
}

@property NSString* name;

-(void)showName;

@end

//
//  Cat.m
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#import "Cat.h"

@implementation Cat

@synthesize name;

-(void)showName
{
    NSLog(@"%@", name);
}
@end

//
//  main.m
//  CategoryProtocol
//
//  Created by God Lin on 14-11-26.
//  Copyright (c) 2014年 hust. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Cat+speak.h"

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        Cat* cat = [[Cat alloc] init];
        
        [cat setName:@"HelloKity"];
        [cat showName];
        [cat speak];
        
    }
    return 0;
}

2014-11-26 22:32:45.488 CategoryProtocol[1741:303] HelloKity
2014-11-26 22:32:45.490 CategoryProtocol[1741:303] HelloKity : 喵喵