When the keyboard appears, scroll the tableView up a pre-defined amount, so the content is nicely centered. I find this useful on a login page.

offsetTableViewWhenKeyboardShown.mm

//-----------------------------------------------------
#pragma mark - When the keyboard appears, scroll the tableView up a pre-defined amount, so the content is nicely centered.
//-----------------------------------------------------
// http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present


// Call this is viewDidLoad
- (void) setupKeyboard {
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:self.view.window];
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:self.view.window];
    _keyboardIsShown = NO;
}


// Call this in dealloc
- (void) cleanKeyboard {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)keyboardWillHide:(NSNotification *)n
{
    [UIView animateWithDuration:.25 animations:^{
        self.tableView.contentOffset = CGPointMake(0, 0);
    }];

    _keyboardIsShown = NO;
}

- (void)keyboardWillShow:(NSNotification *)n
{
    // This is an ivar I'm using to ensure that we do not do the frame size adjustment on the UIScrollView if the keyboard is already shown.  This can happen if the user, after fixing editing a UITextField, scrolls the resized UIScrollView to another UITextField and attempts to edit the next UITextField.  If we were to resize the UIScrollView again, it would be disastrous.  NOTE: The keyboard notification will fire even when the keyboard is already shown.
    if (_keyboardIsShown) {
        return;
    }
    
    [UIView animateWithDuration:.25 animations:^{
        self.tableView.contentOffset = CGPointMake(0, 70);
    }];
    
    _keyboardIsShown = YES;
}