I am creating Keyboard Extension (swift) But unable to get height of keyboard - swift

Question

import UIKit
class KeyboardViewController: UIInputViewController {
var heightKeyboard : CGFloat?
#IBOutlet var nextKeyboardButton: UIButton!
override func updateViewConstraints() {
super.updateViewConstraints()
// Add custom view sizing constraints here
}
override func viewDidLoad() {
super.viewDidLoad()
// Perform custom UI setup here
self.nextKeyboardButton = UIButton(type: .system)
self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), for: [])
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
self.nextKeyboardButton.addTarget(self, action: #selector(handleInputModeList(from:with:)), for: .allTouchEvents)
self.view.addSubview(self.nextKeyboardButton)
self.nextKeyboardButton.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
self.nextKeyboardButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillDisappear), name: UIResponder.keyboardWillHideNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillAppear(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillAppear(notification:)), name: UIResponder.keyboardDidShowNotification, object: nil)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillAppear(true)
NotificationCenter.default.removeObserver(self)
}
#objc func keyboardWillAppear(notification: NSNotification) {
//Do something here
print("keyboardWillAppear()")
print("keyboardShown")
if let infoKey = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey],let rawFrame = (infoKey as AnyObject).cgRectValue {
let keyboardFrame = view.convert(rawFrame, from: nil)
self.heightKeyboard = keyboardFrame.size.height
print(self.heightKeyboard)
}
}
#objc func keyboardWillDisappear() {
print("keyboardWillDisappear()")
}
override func viewWillLayoutSubviews() {
self.nextKeyboardButton.isHidden = !self.needsInputModeSwitchKey
super.viewWillLayoutSubviews()
}
override func textWillChange(_ textInput: UITextInput?) {
// The app is about to change the document's contents. Perform any preparation here.
}
override func textDidChange(_ textInput: UITextInput?) {
// The app has just changed the document's contents, the document context has been updated.
var textColor: UIColor
let proxy = self.textDocumentProxy
if proxy.keyboardAppearance == UIKeyboardAppearance.dark {
textColor = UIColor.white
} else {
textColor = UIColor.black
}
self.nextKeyboardButton.setTitleColor(textColor, for: [])
}
}
I am creating Keyboard Extension (swift) But unable to get height of keyboard . I am using storyboard for keyboard creation. func keyboardWillAppear(),func keyboardWillDisappear() never getting called.
So unable to get keyboard size based on different sizes and orientation