【iOS】NSNotification

NSNotification 常用的几个方法，代码如下：

// 发送通知
[[NSNotificationCenter defaultCenter] postNotificationName:@"broadcastName" object:nil];

// 接收通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doSomething:) name:@"broadcastName" object:nil];

// 移除通知
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"broadcastName" object:nil];