NSNotificationCenter 通知的发布和监听

1.发布通知

    NSDictionary *dic_info = @{
                               @"name":@"water",
                               @"sex":@"man",
                               @"age":@"22"
                               };
    /* self:发送通知的对象
     * dic_info:通知的内容
     */
    /* 创建通知
     */
    NSNotification *note = [NSNotification notificationWithName:@"通知的标题" object:self userInfo:dic_info];
    /* 发送通知
     */
    [[NSNotificationCenter defaultCenter] postNotification:note];

2.监听通知

/* 监听通知
     */
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doSomething:) name:@"通知的标题" object:nil];

3.监听到通知以后,做一些处理

-(void)doSomething:(NSNotification*)note
{
    /* 监听到通知以后,做一些反应,比如通知吃饭去了,然后就要收拾东西,准备吃饭
     */
    NSLog(@"doSomething");
}

4.移除通知

-(void)dealloc
{
    /* 移除通知
     */
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}