notification，protocol,extension,class的混用

程式如下：

協定部分：

//定義了一個拍賣的代理協定，裡面有四個參數，分别是物主，拍賣物的名字，物主提供的價格，拍賣物年代

#import <Foundation/Foundation.h>

@protocol auctionDelegate <NSObject>

-(void)owner:(id)aowner

        name:(id)aname

       price:(int)aprice

       times:(id)atimes;

@end

主人類：

<.h檔案>

#import <Foundation/Foundation.h>

#import "auctionDelegate.h"

@class Company;

@interface Host : NSObject

{

    NSString * _name;

    NSString *_owner;

    int _price;

    NSString * _times;

    BOOL _jewellery;//是否有寶貝

    id<auctionDelegate> _delegate;//聲明了一個代理

}

@property(nonatomic,assign)id<auctionDelegate>delegate;

@property(nonatomic,retain)NSString * name;

@property(nonatomic,retain)NSString*owner;

@property(nonatomic,assign)int price;

@property(nonatomic,retain)NSString * times;

@property(nonatomic,assign)BOOL jewellery;

-(id)initWithName:(NSString *)aName

            Owner:(NSString *)aOwner

            Price:(int)aPrice

            Times:(NSString *)aTimes

         Delegate:(id<auctionDelegate>)aDelegate

         Jewellery:(BOOL)aJewellery;

-(void)adelegate;//協定傳參執行個體方法

-(void)getinfo;//收到通知的反應

-(void)answer1:(Company *)c;//電話回複1

-(void)answer2;//電話回複2

@end

<.m>

#import "Host.h"

//定義了一個延展，裡面含有一個私有方法

#import "Company.h"

@interface Host()

-(BOOL)treasure;

@end

@implementation Host

@synthesize delegate=_delegate;

@synthesize name=_name;

@synthesize owner=_owner;

@synthesize price=_price;

@synthesize times=_times;

@synthesize jewellery=_jewellery;

-(id)initWithName:(NSString *)aName

            Owner:(NSString *)aOwner

            Price:(int)aPrice

            Times:(NSString *)aTimes

         Delegate:(id<auctionDelegate>)aDelegate

        Jewellery:(BOOL)aJewellery;

{

if(self=[super init])

{

    self.name=aName;

    self.owner=aOwner;

    self.price=aPrice;

    self.times=aTimes;

    self.delegate=aDelegate;

    self.jewellery=aJewellery;

//注冊通知

    NSNotificationCenter * center=[NSNotificationCenter defaultCenter];

    [center addObserver:self selector:@selector(getinfo) name:@"auctionResult" object:nil];

}

    return self;}

//如果有寶貝傳回1，沒有傳回0

-(BOOL)treasure

{

    BOOL value=0;

if(self.jewellery==1)

{

    value=1;

}

    return value;

}

//傳參，如果有寶貝，才傳參，沒有則無法進行拍賣

-(void)adelegate

{

    if([self treasure])

    {

        [self.delegate owner:self.owner name:self.name price:self.price times:self.times];

    }

    else

    {

        NSLog(@"沒有寶貝提供拍賣");

    }

}

//物主收到消息後的反應

-(void)getinfo

{

    NSLog(@"%@:我已經知道了",self.owner);

}

//電話回複1

-(void)answer1:(Company *)c

{

    NSLog(@"繼續拍賣！");

    [self.delegate owner:self.owner name:self.name price:c.money times:self.times];

}

//電話回複2

-(void)answer2

{

    NSLog(@"我不拍賣了!");

}

//釋放記憶體

-(void)dealloc

{  

    NSNotificationCenter * center=[NSNotificationCenter defaultCenter];

    [center removeObserver:self name:@"auctionResult" object:nil];

    [_name release];

    [_owner release];

    [_times release];

    [super dealloc];

}

@end

公司類：

<.h>

#import <Foundation/Foundation.h>

#import "auctionDelegate.h"

@class Host;

@interface Company : NSObject<auctionDelegate>

{

//拍賣會現場提供的報價

    int _money;

}

@property(nonatomic,assign)int money;

//在現場供價後，打電話給物主，是否繼續進行拍賣

-(void)phone1:(Host *)h;

-(id)initWithMoney:(int)aMoney;

@end

;

<.m>

#import "Company.h"

#import "Host.h"

@implementation Company

@synthesize money=_money;

-(id)initWithMoney:(int)aMoney;

{

if(self =[super init])

{

    self.money=aMoney;

}

    return self;}

-(void)phone

{

//拍賣成功後，給物主發送通知

    NSNotificationCenter * center=[NSNotificationCenter defaultCenter];

    [center postNotificationName:@"auctionResult" object:self];

}

//實作協定方法

-(void)owner:(id)aowner name:(id)aname price:(int)aprice times:(id)atimes

{

    NSLog(@"物主:%@,寶物名稱:%@,價錢:%d,年代:%@",aowner,aname,aprice,atimes);

     [self phone];

}

//正常拍賣，價格不可能和物主提供的價格一樣，是以拍賣方進行了比較人性化的處理，打電話給物主

//如果價格相等，繼續拍賣；如果大于物主價格，調用物主的第一通回複電話，如果小于，調用物主的第二桶電話

-(void)phone1:(Host *)h

{

if(self.money==h.price)

    [h adelegate];

else if(self.money>=h.price)

{

    [h answer1:self];

}

else if(self.money<h.price)

    [h answer2];

}

啟發：如果代理不遵守協定，oc是支援強行将不遵守協定的對象作為代理的；

我是一個菜雞，如果上面有錯誤或者可優化之處，請各位不吝賜教。