NSNotification

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];


 - Notification 받기
[nc addObserver:self selector:@selector(myMethod:) name:@"myNotiName" object:nil];

 - Notification 날리기
[nc postNotificationName:@"myNotiName" object:self userInfo:nil];

 - Notification 해제
[nc removeObserver:self name:@"myNotiName" object:nil];

메소드 선언은 다음과 같이

-(void)myMethod:(NSNotification *)noti{

NSString *stringValue = [[noti userInfo] objectForKey:@"inputKey"];

}

값담기

NSDictionary *dic = [NSDictionary dictionaryWithObject:_textField.text forKey:@"key"]; 

가져올땐

NSString *text = [[note userInfo] objectForKey:@"key"];