Get UITableView to scroll to the selected UITextField and Avoid Being Hidden by Keyboard

Question

I have a UITextField in a table view on a UIViewController (not a UITableViewController). If the table view is on a UITableViewC

Answer 1

Swift

@objc private func keyboardWillShow(_ notification: Notification) {
    guard let userinfo = notification.userInfo else {
        return
    }

    guard
        let duration = (userinfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue,
        let endFrame = (userinfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
        let curveOption = userinfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? UInt else {
            return
    }
    
    UIView.animate(withDuration: duration, delay: 0, options: [.beginFromCurrentState, .init(rawValue: curveOption)], animations: {
        let edgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: endFrame.height, right: 0)
        self.scrollView.contentInset = edgeInsets
        self.scrollView.scrollIndicatorInsets = edgeInsets
    })
}

@objc private func keyboardWillHide(_ notification: Notification) {
    guard let userinfo = notification.userInfo else {
        return
    }

    guard
        let duration = (userinfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue,
        let curveOption = userinfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? UInt else {
            return
    }
    
    UIView.animate(withDuration: duration, delay: 0, options: [.beginFromCurrentState, .init(rawValue: curveOption)], animations: {
        let edgeInsets = UIEdgeInsets.zero
        self.scrollView.contentInset = edgeInsets
        self.scrollView.scrollIndicatorInsets = edgeInsets
    })
}


override func viewDidLoad() {
    super.viewDidLoad()
    
    // ...

    subscribeToKeyboardNotifications()
}

deinit {
    unsubscribeFromKeyboardNotifications()
}

private func subscribeToKeyboardNotifications() {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIWindow.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIWindow.keyboardWillHideNotification, object: nil)
}

private func unsubscribeFromKeyboardNotifications() {
    NotificationCenter.default.removeObserver(self, name: UIWindow.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIWindow.keyboardWillHideNotification, object: nil)
}

Objective C

- (void)keyboardWillShow:(NSNotification *)sender
{
    CGFloat height = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
    NSTimeInterval duration = [[sender.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationOptions curveOption = [[sender.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue] << 16;
    
    [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionBeginFromCurrentState|curveOption animations:^{
        UIEdgeInsets edgeInsets = UIEdgeInsetsMake(0, 0, height, 0);
        tableView.contentInset = edgeInsets;
        tableView.scrollIndicatorInsets = edgeInsets;
    } completion:nil];
}

- (void)keyboardWillHide:(NSNotification *)sender
{
    NSTimeInterval duration = [[sender.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationOptions curveOption = [[sender.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue] << 16;

    [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionBeginFromCurrentState|curveOption animations:^{
        UIEdgeInsets edgeInsets = UIEdgeInsetsZero;
        tableView.contentInset = edgeInsets;
        tableView.scrollIndicatorInsets = edgeInsets;
    } completion:nil];
}

And in - (void)viewDidLoad

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

Then

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