Objective-C中的发通知的（Notification)

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

//先在通知中心注册
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doSomething:) name:NOTIFICATION_MESSAGE object:nil];
}

- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:YES];

// [[NSNotificationCenter defaultCenter] removeObserver:self];

}

-(void)doSomething:(NSNotification *)notification
{

//接受消息
NSDictionary *Info = [notification userInfo];
//输出收到的信息
NSLog(@“消息收到：%@", Info[@"notification"]);
}

@implementation ChatViewController

- (void)viewDidLoad
{
[super viewDidLoad];

[self initContentView];
}

- (void)initContentView
{
UIButton *_commitBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, 179, kDEVICEWIDTH-30, 45)];
_commitBtn.backgroundColor = [UIColor grayColor];
[_commitBtn addTarget:self action:@selector(commitClick) forControlEvents:UIControlEventTouchUpInside];
[_commitBtn setTitle:@"发消息" forState:UIControlStateNormal];
_commitBtn.titleLabel.textColor = [UIColor whiteColor];
_commitBtn.layer.cornerRadius = 4;
[self.view addSubview:_commitBtn];

}

- (void)commitClick
{
[self sendMessage];
}

#pragma mark - NSNotification method

-(void)sendMessage
{
//把要发送的信息放入字典中
NSDictionary *message = @{@"notification" : @“NSNotification消息测试通过！”};

//创建通知对象
NSNotification * notification = [NSNotification notificationWithName:NOTIFICATION_MESSAGE object:self userInfo:message];

//向通知中心发送消息（发布消息）
//[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_MESSAGE object:nil];
//向通知中心发送消息（发布消息）
[[NSNotificationCenter defaultCenter] postNotification:notification];
}