Question

I have a UITableView, which I am controlling from a custom UIViewController. When the user clicks the ‘add’ button, I add a row to the UITableView with a text field in it, and make it the first responder. The problem is, when the bottom of the table is out of view (or hidden by the keyboard), the UITableView doesn’t scroll to bring the text field into view.

UITableViewController does this automatically, but my View Controller can’t be a subclass of UITableViewController.

Answer 1

I fixed this by twiddling contentInset on the UITableView when the keyboard appears or disappears.

- (void)registerForKeyboardNotifications {
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasHidden:)
                                                 name:UIKeyboardDidHideNotification object:nil];
}

- (void)keyboardWasShown:(NSNotification *)aNotification {
    CGRect keyboardBounds;
    [[aNotification.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &keyboardBounds];
    keyboardHeight = keyboardBounds.size.height;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0);
    [UIView commitAnimations];
    [tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:[items count] inSection:0]
                     atScrollPosition:UITableViewScrollPositionMiddle
                             animated:YES];
}

- (void)keyboardWasHidden:(NSNotification *)aNotification {
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    tableView.contentInset = UIEdgeInsetsZero;
    [UIView commitAnimations];
}

call registerForKeyboardNotifications when you load the UITableView, and everything else should Just Work.