// 初始化通知中心
        NSNotificationCenter *center =[NSNotificationCenter defaultCenter];

- (void)addObserver:(id)observer selector:(SEL)aSelector name:(NSString *)aName object:(id)anObject;

- (id)addObserverForName:(NSString *)name object:(id)obj queue:(NSOperationQueue *)queue 
　　　　　　　　　　　　　　  usingBlock:(void (^)(NSNotification *note))block;

- (void)removeObserver:(id)observer;
- (void)removeObserver:(id)observer name:(NSString *)aName object:(id)anObject;

- (void)dealloc {
  //[super dealloc];  非ARC中需要调用此句
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

//  新闻发布机构

#import <Foundation/Foundation.h>

@interface NewsCompany : NSObject
/**
 *  机构名称
 */
@property (nonatomic, copy) NSString *name;
@end

#import "NewsCompany.h"

@implementation NewsCompany

@end

#import <Foundation/Foundation.h>

@interface Person : NSObject
/**
 * 姓名
 */
@property (nonatomic, copy) NSString *name;

- (void)newsCome:(NSNotification *)note;
@end

#import "Person.h"
#import "NewsCompany.h"

@implementation Person

// 收到通知后，回调监听器的这个方法，并且把通知对象当做参数传入
- (void)newsCome:(NSNotification *)note
{
    // 通知的发布者
    NewsCompany *obj = note.object;
    
    NSLog(@"%@接收到了%@发出的通知,通知内容是:%@", self.name, obj.name, note.userInfo);
}

// 一般在监听器销毁之前取消注册
- (void)dealloc
{
//    [super dealloc];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end

#import <Foundation/Foundation.h>
#import "Person.h"
#import "NewsCompany.h"

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        // 1.初始化机构
        NewsCompany *tx = [[NewsCompany alloc] init];
        tx.name = @"腾讯新闻";
        
        NewsCompany *sina = [[NewsCompany alloc] init];
        sina.name = @"新浪新闻";
        
        // 2.初始化2个人
        Person *zhangsan = [[Person alloc] init];
        zhangsan.name = @"张三";
        
        Person *lisi = [[Person alloc] init];
        lisi.name = @"李四";
        
        // 初始化通知中心
        NSNotificationCenter *center =[NSNotificationCenter defaultCenter];
        
        // 3.注册通知监听器
        // zhangsan只监听tx发出的junshi_news_come通知
        [center addObserver:zhangsan selector:@selector(newsCome:) name:@"junshi_news_come" object:nil];
        // lisi监听tx发的所有通知
        [center addObserver:lisi selector:@selector(newsCome:) name:nil object:tx];
        
        // 4.发布通知
        // tx发布了一则叫做junshi_news_come的通知
        [center postNotificationName:@"junshi_news_come"
                              object:tx
                            userInfo:@{@"title" : @"伊拉克战争停止了",
                                       @"intro" : @"伊拉克战争停止了.........."}];
        
        // sina发布了一则叫做junshi_news_come的通知
        [center postNotificationName:@"yule_news_come"
                              object:sina
                            userInfo:@{@"title" : @"6456456456456",
                                       @"intro" : @"7657567567567"}];
        
    }
    return 0;
}