通知

送信

//通知送信
NSNotification *notification = [NSNotification notificationWithName:@"hoge" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];

受信

//通知受信
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(test) name:@"hoge" object:nil];

//呼ばれる関数
- (void)test {
    NSLog(@"notification!");
}

削除

- (void) dealloc {
    //通知受信の削除
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc removeObserver:self name:@hoge" object:nil];
    [super dealloc];
}