day09-02-协议

Objective-c

//  main.m
//  day09-02-协议
//
//  Created by Aaron on 15/7/13.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
//协议
//网络协议
//应用协议
//OC有协议这种语法
//专门用来规定方法
#import "Student.h"
#import "JiangShi.h"
#import "BanZhuRen.h"
#import "Dog.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        JiangShi *j = [[JiangShi alloc] init];
        Student *std = [[Student alloc] init];
        //[std askToTeacher:j];
        BanZhuRen *b = [[BanZhuRen alloc] init];
        //[std askToTeacher:b];
        [std askToSomeOne:j];
        Dog *d = [[Dog alloc] init];
        [std askToSomeOne:d];
    }
    return 0;
}

#import "Teacher.h"
@interface BanZhuRen : Teacher
//-(NSString *)banZhuRenAnswer;
@end

#import "BanZhuRen.h"
@implementation BanZhuRen
//-(NSString *)banZhuRenAnswer
//{
//    return @"考得非常好";
//}
@end

#import <Foundation/Foundation.h>
//#import "Teacher.h"
//#import "JiangShi.h"
//#import "BanZhuRen.h"
//协议的制定
@protocol StudentScore <NSObject>
//协议里面规定的是方法
-(NSInteger)answerScore;
@end
@interface Student : NSObject
//-(void)askToJiangShi:(JiangShi *)j;
//-(void)askToBanZhuRen:(BanZhuRen *)b;
//-(void)askToTeacher:(Teacher *)teacher;
//让someOne遵守协议
-(void)askToSomeOne:(id <StudentScore>) someOne;
@end

#import "Student.h"
@implementation Student
//-(void)askToJiangShi:(JiangShi *)j
//{
//    NSLog(@"讲师,我考了多少分?");
//    NSLog(@"讲师回答:%ld",
//          [j jiangShiAnswer]);
//}
//
//-(void)askToBanZhuRen:(BanZhuRen *)b
//{
//    NSLog(@"讲师,我考了多少分?");
//    NSLog(@"班主任回答:%@",
//          [b banZhuRenAnswer]);
//}
//-(void)askToTeacher:(Teacher *)teacher
//{
//    NSLog(@"考了多少分");
//    NSLog(@"考了%ld分",
//          [teacher teacherAnswer]);
//}
-(void)askToSomeOne:(id <StudentScore>) someOne
{
    NSLog(@"考了多少分");
    //协议的作用是统一接口
    //统一接口用协议更常用,因为代码更通用,耦合性更低
    NSLog(@"考了%ld分",
          [someOne answerScore]);
}
@end

import "Teacher.h"
#import "Student.h"
//包含头文件
//遵循协议,<协议名>
@interface JiangShi : Teacher <StudentScore>
//-(NSInteger)jiangShiAnswer;
@end

#import "JiangShi.h"
@implementation JiangShi
//-(NSInteger)jiangShiAnswer
//{
//    return 98;
//}
//遵循了协议,就要实现协议的方法
//协议里面的方法,不需要再声明
-(NSInteger)answerScore
{
    return 98;
}
@end

#import <Foundation/Foundation.h>
#import "Student.h"
@interface Dog : NSObject <StudentScore>
@end

import "Dog.h"
@implementation Dog
-(NSInteger)answerScore
{
    return 10000;
}
@end

#import <Foundation/Foundation.h>
@interface Teacher : NSObject
-(NSInteger)teacherAnswer;
@end

#import "Teacher.h"
@implementation Teacher
-(NSInteger)teacherAnswer
{
    return 99;
}
@end