观察者模式的使用

44、不带参数通知的使用

//新建通知

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(newMsg)

                                                 name: @"newmsg1"

                                               object: nil];

//通知调用的方法

- (void)newMsg{

}

//调用通知

    [[NSNotificationCenter defaultCenter] postNotificationName:@"newmsg" object:self];

45、带参数通知的使用

//新建通知

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(newMsg:)

                                                 name: @"newmsg1"

                                               object: nil];

//通知调用的方法

- (void)newMsg:(NSNotification *)note{

    NSLog(@"%@", [note userInfo]);

}

//调用通知

[[NSNotificationCenter defaultCenter] postNotificationName:@"newmsg1" object:nil userInfo:[NSDictionary dictionaryWithObject:@"succ" forKey:@"result"]];