// 发送通知
- (void)postNotificaiton {
CFNotificationCenterRef notification = CFNotificationCenterGetDarwinNotifyCenter ();
CFNotificationCenterPostNotification(notification, CFSTR("<notificaiton name>"), NULL,NULL, YES);
} 
// 接收通知
- (void)receiveNotification {
CFNotificationCenterRef notification = CFNotificationCenterGetDarwinNotifyCenter (); 
CFNotificationCenterAddObserver(notification, (__bridge const void *)(self), observerMethod,CFSTR("<notificaiton name>"), NULL, CFNotificationSuspensionBehaviorDeliverImmediately); 
}
void observerMethod (CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{ 
// Your custom work 
} 
// 移除通知
- (void)removeNotification
{
CFNotificationCenterRef notification = CFNotificationCenterGetDarwinNotifyCenter ();
CFNotificationCenterRemoveObserver(notification, (__bridge const void *)(self), CFSTR("<notificaiton name>"), NULL);
}