Make a whole view scroll up to make the control appear when keyboard shows up. self.rootScrollView is a scrollview that stretches in the whole screen.

keyboard handling in iOS

- (void)observeKeyboard
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)stopObservingKeyboard
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)keyboardWillShow:(NSNotification *)notification
{
    CGFloat verticalShift = 125.0f;
    
    [UIView animateWithDuration:0.3
                     animations:^{
                         self.rootScrollView.contentSize = CGSizeMake(CGRectGetWidth(self.rootScrollView.frame),
                                                                      CGRectGetHeight(self.rootScrollView.frame) + verticalShift);
                         
                         self.rootScrollView.contentOffset = CGPointMake(0, verticalShift);
                     }];
}


- (void)keyboardWillHide:(NSNotification *)notification
{
    [UIView animateWithDuration:0.3
                     animations:^{
                         self.rootScrollView.contentSize = self.rootScrollView.frame.size;
                         self.rootScrollView.contentOffset = CGPointMake(0, 0);
                     }];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self observeKeyboard];
}

-(void) dealloc
{
    [self stopObservingKeyboard];
}