@IBOutlet weak var scrollView: UIScrollView!
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
registerNotifications()
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
unregisterNotifications()
}
private func registerNotifications() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
private func unregisterNotifications() {
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
scrollView.contentInset.bottom = 0
}
@objc private func keyboardWillShow(notification: NSNotification){
guard let keyboardFrame = notification.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }
scrollView.contentInset.bottom = view.convert(keyboardFrame.cgRectValue, from: nil).size.height
}
@objc private func keyboardWillHide(notification: NSNotification){
scrollView.contentInset.bottom = 0
}