OC通知中心

//通知中心广播站建立
//1.head.h
#import <Foundation/Foundation.h>

@interface BJBroadcast : NSObject
-(void)sendBroadCast;
-(void)sendBroadCastLoop;
@end

//2.implementation
#import "BJBroadcast.h"

@implementation BJBroadcast
-(void)sendBroadCastLoop
{
    //每隔一秒发送一次广播消息
    [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(sendBroadCast) userInfo:nil repeats:YES];
}

-(void)sendBroadCast
{
    //创建广播站
    NSNotificationCenter * notificationCenter = [NSNotificationCenter defaultCenter];
    
    static NSUInteger i;
    
    NSString *count=[[NSString alloc]initWithFormat:@"broadCount %ld",i++];
    
    NSDictionary *dic=[[NSDictionary alloc]initWithObjectsAndKeys:@"BJBroadcast",@"Name",count,@"Timer", nil];
    
    [notificationCenter postNotificationName:@"BJBroadcast" object:self userInfo:dic];
    [count release];
    [dic release];
}
@end

//广播接受者
//1.head.h

@interface Listener : NSObject
-(void)wantTolistenBroadcast;
@end

//implementation
#import "Listener.h"

@implementation Listener
-(void)wantTolistenBroadcast
{
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(Broadcast:) name:@"BJBroadcast" object:nil];
/*#program mark
    1.addObserver:表示谁对通知中心发出的信息感兴趣
    2.selector:收到该感兴趣信息的处理函数
    3.name:对什么名字的广播感兴趣
    4.object:对谁发出的广播感兴趣,nil表示对任何人发出的广播都感兴趣
*/
}
-(void)Broadcast:(NSNotification *)notification
{
    NSLog(@"%@",notification);
}
@end

//main
#import <Foundation/Foundation.h>
#import "BJBroadcast.h"
#import "Listener.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        Listener *aListener=[[Listener alloc]init];
        
        [aListener wantTolistenBroadcast];
        
        BJBroadcast *Bj=[[BJBroadcast alloc]init];

        [Bj sendBroadCastLoop];
        [[NSRunLoop currentRunLoop] run];//一定要添加该方法,否则无法循环
        
        [aListener release];
        [Bj release];
    }
    return 0;
}