1 //  Myprotocol.h
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import <Foundation/Foundation.h>
 9 
10 @protocol Myprotocol 
11 @property(nonatomic,assign)NSInteger integer;
12 -(id)initWithInteger:(NSInteger) i;
13 -(void) show2;
14 -(void)print;
15 -(void) initialize;
16 @end

 1 //  Teacher.h
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import <Foundation/Foundation.h>
 9 @protocol TeacherDelegate//老师制定协议规则
10 @required //在协议代理人类中必须要全部实现的方法
11 -(void) show1;
12 -(void) Standup;
13 -(void) Answerquestion;
14 @optional //协议代理人类中可以选择性的实现(可以实现，也可以不用实现)
15 -(void) Setdown;
16 @end
17 
18 
19 @interface Teacher : NSObject
20 @property(nonatomic,weak) id<TeacherDelegate> delegate;
21 -(void)ordering;
22 @end

 1 //  Teacher.m
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import "Teacher.h"
 9 
10 @implementation Teacher
11 @synthesize delegate;
12 -(void)ordering
13 {
14     [delegate show1];
15     NSLog(@"teacher is ordering!");
16     [self.delegate Standup];
17     [self.delegate Answerquestion];
18     [self.delegate Setdown];
19 }
20 @end

 1 //  Student.h
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import "Teacher.h"
 9 #import "TeacherDelegate.h"
10 #import "Myprotocol.h"
11 @interface Student : Teacher<TeacherDelegate,Myprotocol>
12 @end

 1 //  Student.m
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import "Student.h"
 9 
10 @implementation Student
11 @synthesize integer;
12 //TeacherDelegate
13 -(void) show1
14 {
15     NSLog(@"the teacher's protocol is running!");
16 }
17 -(void) Standup
18 {
19     NSLog(@"student stand up.");
20 }
21 -(void) Answerquestion
22 {
23     NSLog(@"student answer question.");
24 }
25 -(void) Setdown
26 {
27     NSLog(@"student set down!");
28 }
29 //Myprotocol
30 -(void) show2
31 {
32     NSLog(@"the my protocol is running!");
33 }
34 -(id)initWithInteger:(NSInteger) i
35 {
36     self = [super init];
37     if(self)
38     {
39         self.integer = i;
40     }
41     return self;
42 }
43 -(void)print
44 {
45     NSLog(@"integer=%ld",self.integer);
46 }
47 -(void) initialize
48 {
49     NSLog(@"Integer's initialization succeed.");
50 }
51 @end

 1 //  main.m
 2 //  协议
 3 //
 4 //  Created by ma c on 15/8/12.
 5 //  Copyright (c) 2015年. All rights reserved.
 6 //
 7 
 8 #import <Foundation/Foundation.h>
 9 #import "Teacher.h"
10 #import "Student.h"
11 #import "Myprotocol.h"
12 int main(int argc, const char * argv[])
13 {
14     @autoreleasepool
15     {
16         Teacher *teacher = [[Teacher alloc]init];
17         
18         //老师设置学生代理实现老师设置的协议(TeacherDelegate)
19         Student *student = [[Student alloc]init];
20         [teacher setDelegate:student];
21         [teacher ordering];
22         printf("\n");
23         
24         //我设置学生代理实现我设置的协议(Myprotocol)
25         Student *stu = [[Student alloc]initWithInteger:10];
26         [stu show2];
27         [stu print];
28         [stu initialize];
29     }
30     return 0;
31 }

2015-08-12 19:55:51.498 协议[1965:139749] the teacher's protocol is running!
2015-08-12 19:55:51.499 协议[1965:139749] teacher is ordering!
2015-08-12 19:55:51.499 协议[1965:139749] student stand up.
2015-08-12 19:55:51.500 协议[1965:139749] student answer question.
2015-08-12 19:55:51.500 协议[1965:139749] student set down!

2015-08-12 19:55:51.500 协议[1965:139749] the my protocol is running!
2015-08-12 19:55:51.500 协议[1965:139749] integer=10
2015-08-12 19:55:51.500 协议[1965:139749] Integer's initialization succeed.
Program ended with exit code: 0