黑马程序员--oc基础第八篇

 1 //
 2 //  main.m
 3 //  Protocal终极练习
 4 //
 5 //  Created by keeganlee on 15/2/11.
 6 //  Copyright (c) 2015年 keeganlee. All rights reserved.
 7 //
10 
11 #import <Foundation/Foundation.h>
12 #import "Student.h"
13 #import "Agenta.h"
14 #import "Agentb.h"
15 #import "MyprotocalB.h"
16 int main(int argc, const char * argv[]) {
17     @autoreleasepool {
18       
19         id<MyprotocalA> agenta=[[Agenta alloc] init];
20         
21         id<MyprotocalB> agentb=[[Agentb alloc] init];
22         
23         
24         Student *stu=[Student new];
25         
26         stu.d=agenta;
27         
28         [stu buyTicket];
29         
30         stu.d=agentb;
31         
32         [stu buyTicket];
33           
34         
35         
36     }
37     return 0;
38 }

//
//  Person.h
//  Protocal终极练习
//
//  Created by keeganlee on 15/2/11.
//  Copyright (c) 2015年 keeganlee. All rights reserved.
//

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


@interface Person : NSObject <MyprotocalB>

@property (nonatomic,assign) int age;


@end

//
//  Person.m
//  Protocal终极练习
//
//  Created by keeganlee on 15/2/11.
//  Copyright (c) 2015年 keeganlee. All rights reserved.
//

#import "Person.h"

@implementation Person

@end

#import "Person.h"

@interface Student : Person

@property (nonatomic,strong) id<MyprotocalB,MyprotocalA> d;//因为是id类型，在student的实现时，用遵循这个协议的类的对象调用特有的方法肯定是通不过的~~但是这时候加上这个协议，就相当于告诉编译器这里面有这些方法 可以使用。所以编译器就准许通过！！~

- (void)buyTicket;

@end

#import "Student.h"

@implementation Student

-(void)buyTicket
{
    int c=[_d ticketRemain];//这里虽然没有agent两个类的。h文件但是编译器仍然可以认识这个具体方法 这就是接口的好处！！
    NSLog(@"There has %d ticket left~",c);
    [_d confirmToBuy];
}

@end

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

@interface Agenta : NSObject <MyprotocalB>

@end

#import <Foundation/Foundation.h>
#import "MyprotocalB.h"
@interface Agentb : NSObject <MyprotocalB>

@end

#import "Agenta.h"

@implementation Agenta

-(int)ticketRemain
{
    return 100;
}

-(void)confirmToBuy
{
    NSLog(@"OK~~!! you have got the ticket~~");
}
@end

#import "Agentb.h"

@implementation Agentb

-(int)ticketRemain
{
    return 1000;
}

-(void)confirmToBuy
{
    NSLog(@"SORRY ~All ticekt has been solded~~~~~");
}
@end

#import <Foundation/Foundation.h>

@protocol MyprotocalA <NSObject>


- (int) ticketRemain;

- (void) confirmToBuy;

@end

#import <Foundation/Foundation.h>

#import "MyprotocalA.h"

@protocol MyprotocalB <NSObject,MyprotocalA>

@end