Adjust content insets of a tableview when keyboard opens.

KeyboardNotification.m

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

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)keyboardWillShow:(NSNotification *)notification
{    
    CGSize keyboardSize = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
    
    UIEdgeInsets contentInsets;
    if (UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation])) {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.height), 0.0);
    } else {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.width), 0.0);
    }
    
    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = contentInsets;
        self.tableView.scrollIndicatorInsets = contentInsets;
    }];
    [self.tableView scrollToRowAtIndexPath:self.editingIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)keyboardWillHide:(NSNotification *)notification
{
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = UIEdgeInsetsZero;
        self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero;
    }];
}

Should be UIKeyboardFrameEndUserInfoKey. In iOS11, the height is 0 when you use UIKeyboardFrameBeginUserInfoKey! Also, on iPhoneX the height is 75 pts more in portrait mode. So, you are better off adjusting a constraint of the tableview that is pinned to the bottom of the superview because the keyboard is pinned to the bottom of the superview too. Then you don't need to change the tableview contentInset at all. This works on all devices.