oc 通知中心
这是我在 千峰视频网上看到的 对于学习通知的例子还是挺有用的。
一、首先创建一个简单的命令行工程
//
// BJBroadcast.m
// 通知中心
//
// Created by qin on 14-4-29.
// Copyright (c) 2014年 zhou. All rights reserved.
//
//通知中心代码
#import "BJBroadcast.h"
@implementation BJBroadcast
- (void)broadvastLooper
{
[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(broadcast) userInfo:nil repeats:YES];
}
- (void)broadcast
{
//1.取得通知中心
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
static int i;
NSString *count = [NSString stringWithFormat:@"bcast %d",i++];
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"BJ broadcast",@"name",count,@"Value", nil];
//2.发送广播
[nc postNotificationName:@"BJBroadcast" object:self userInfo:dict];
}
@end
//接收方代码
#import "Listener.h"
@implementation Listener
- (void)wantToListen
{
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(recvBcast:) name:@"BJBroadcast" object:nil];
//param1 param2 这两个参数是只要有BJBroadcast广播就调用[self recvBcast]
//第四个蚕食一般都设为nil
//要真正的接收广播数据
}
- (void)recvBcast:(NSNotification *)notify
{
// NSString *name = notify.name;
NSLog(@"notiy is %@",notify);
}
@end
主函数：
#import <Foundation/Foundation.h>
#import "BJBroadcast.h"
#import "Listener.h"
int main(int argc, const char * argv[])
{
@autoreleasepool
{
Listener *l1 = [[Listener alloc]init];
[l1 wantToListen]; //监听者
BJBroadcast *bj = [[BJBroadcast alloc]init];
[bj broadcast]; //通知者
[[NSRunLoop currentRunLoop]run];
}
return 0;
}
打印：
2014-04-29 23:41:21.131 通知[760:303] notiy is NSConcreteNotification 0x10010c790 {name = BJBroadcast; object = <BJBroadcast: 0x10010c200>; userInfo = {
Value = "bcast 0";
name = "BJ broadcast";
}}
主要的代码 就是发送广播和接收广播
[nc postNotificationName:@"BJBroadcast" object:self userInfo:dict];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(recvBcast:) name:@"BJBroadcast" object:nil];
开发中经常会用到通知....