[[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillShow:)

                                                 name:UIKeyboardWillShowNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardShow:)

                                                 name:UIKeyboardDidShowNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillHide:)

                                                 name:UIKeyboardWillHideNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardHide:)

                                                 name:UIKeyboardDidHideNotification

                                               object:nil];

- (void)keyboardWillShow:(NSNotification *)notif {

    if (self.hidden == YES) {

        return;

    }

    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    CGFloat y = rect.origin.y;

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:0.25];

    NSArray *subviews = [self subviews];

    for (UIView *sub in subviews) {

        CGFloat maxY = CGRectGetMaxY(sub.frame);

        if (maxY > y - 2) {

            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);

        }

    }

    [UIView commitAnimations];

}

- (void)keyboardShow:(NSNotification *)notif {

    if (self.hidden == YES) {

        return;

    }

}

- (void)keyboardWillHide:(NSNotification *)notif {

    if (self.hidden == YES) {

        return;

    }

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:0.25];

    NSArray *subviews = [self subviews];

    for (UIView *sub in subviews) {

        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {

            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);

        }

    }

    [UIView commitAnimations];

}

- (void)keyboardHide:(NSNotification *)notif {

    if (self.hidden == YES) {

        return;

    }

}