Get Height of iOS Keyboard Without Displaying Keyboard

Get height of iOS keyboard without displaying keyboard

A quick solution that you could use, is the same one used when you want to cache the keyboard (the first time you show it, you get a slight delay...). The library is here. The interesting bits:

[[[[UIApplication sharedApplication] windows] lastObject] addSubview:field];
[field becomeFirstResponder];
[field resignFirstResponder];
[field removeFromSuperview];

So basically is showing it and then hiding it. You could listen for notifications and just get the height without actually seeing it. Bonus: you get to cache it. :)

How to get height of Keyboard?

Swift

You can get the keyboard height by subscribing to the UIKeyboardWillShowNotification notification. (Assuming you want to know what the height will be before it's shown).

Swift 4

NotificationCenter.default.addObserver(
    self,
    selector: #selector(keyboardWillShow),
    name: UIResponder.keyboardWillShowNotification,
    object: nil
)

@objc func keyboardWillShow(_ notification: Notification) {
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
    }
}

Swift 3

NotificationCenter.default.addObserver(
    self,
    selector: #selector(keyboardWillShow),
    name: NSNotification.Name.UIKeyboardWillShow,
    object: nil
)

@objc func keyboardWillShow(_ notification: Notification) {
    if let keyboardFrame: NSValue = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
    }
}

Swift 2

NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)

func keyboardWillShow(notification: NSNotification) {
        let userInfo: NSDictionary = notification.userInfo!
        let keyboardFrame: NSValue = userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey) as! NSValue
        let keyboardRectangle = keyboardFrame.CGRectValue()
        let keyboardHeight = keyboardRectangle.height
    }

Get Keyboard frame without keyboardWillAppear userinfo notification, iOS

You can use a UITextField and call becomeFirstResponder and immediately resignFirstResponder on it, so it will be shown and hidden without actually seeing the keyboard.

the action method of the button will look like the following:

@IBAction func showPickerView(sender: AnyObject)
{
    let textField = UITextField()
    view.addSubview(textField)
    textField.becomeFirstResponder()
    textField.resignFirstResponder()
    textField.removeFromSuperview()
}

And you could listen to the notification and get the height.

for further information: Get height of iOS keyboard without UIKeyboardWillShowNotification

How to get keyboard height WITHOUT relying on notifications

You still have to use NSNotificationCenter, but you have to observe a different key. The key you're looking for is UIKeyboardDidChangeFrameNotification which according to the docs is posted immediately after a change in the keyboard’s frame.

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