NSNotificationCenter

注册一个Notification

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(receivedNotification:)

                                                 name:@"Address Found"

                                               object:nil];

激发一个Notification

[[NSNotificationCenter defaultCenter] postNotificationName:@"Address Found" object:self];

响应函数

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

    if ([[notification name] isEqualToString:@"Address Found"]) {

        //do something;

    } 

}

NSNotificationCenter

原文：http://www.cnblogs.com/scaptain/p/4103933.html