第二十一讲：Objective-C基本数据结构之协议
本帖最后由 Sian 于 2014-1-20 22:11 编辑1、什么是协议
2、如何定义协议
3、如何实现协议
MyProtocol.h
//
//MyProtocol.h
//Protocol
//
//Created by yusian on 14-1-20.
//Copyright (c) 2014年 yusian. All rights reserved.
//
#import <Foundation/Foundation.h>
@protocol MyProtocol <NSObject>
@required
- (int)printValue:(int)value1 andValue:(int)value2;
@optional
- (void)print:(int)value;
@end
MyTest.h
//
//MyTest.h
//Protocol
//
//Created by yusian on 14-1-20.
//Copyright (c) 2014年 yusian. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "MyProtocol.h"
@interface MyTest : NSObject <MyProtocol>
- (void)showInfo;
@end
MyTest.m
//
//MyTest.m
//Protocol
//
//Created by yusian on 14-1-20.
//Copyright (c) 2014年 yusian. All rights reserved.
//
#import "MyTest.h"
@implementation MyTest
- (void)showInfo
{
NSLog(@"showInfo is calling");
}
- (int)printValue:(int)value1 andValue:(int)value2
{
NSLog(@"printValue is %d, printValue is %d",value1,value2);
return 0;
}
- (void)print:(int)value
{
NSLog(@"print is %d",value);
}
@end
main.m
//
//main.m
//Protocol
//
//Created by yusian on 14-1-20.
//Copyright (c) 2014年 yusian. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "MyTest.h"
#import "MyProtocol.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
MyTest * myTest = [ init];
;
//**************************************************
//实现方法一：
NSLog(@"实现方法一：");
;
SEL sel = @selector(print:);
if () {
;
}
;
//**************************************************
//实现方法二：
NSLog(@"实现方法二：");
id <MyProtocol> myTest_Protocol = [ init];
;
if () {
;
}
;
//**************************************************
}
return 0;
}
输出结果：
2014-01-20 21:38:06.164 Protocol showInfo is calling
2014-01-20 21:38:06.165 Protocol 实现方法一：
2014-01-20 21:38:06.166 Protocol printValue is 10, printValue is 20
2014-01-20 21:38:06.166 Protocol print is 100
2014-01-20 21:38:06.166 Protocol 实现方法二：
2014-01-20 21:38:06.167 Protocol printValue is 100, printValue is 200
2014-01-20 21:38:06.167 Protocol print is 1000
Program ended with exit code: 0
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