NSNotificationCenter Swift 3.0 on keyboard show and hide

Question

I am trying to run a function when the keyboard shows and disappears and have the following code:

let notificationCenter = NotificationCenter.default
notific         


        

Answer 1

KeyBoard Will Show And Hide With TxtField In Swift 4

class ViewController: UIViewController {


@IBOutlet weak var commentsTxt: UITextField!
@IBOutlet weak var keyboardBottom: NSLayoutConstraint!

override func viewWillAppear(_ animated: Bool) {
    IQKeyboardManager.shared.enable = false
    NotificationCenter.default.addObserver(
        self,
        selector: #selector(keyboardWillShow),
        name: UIResponder.keyboardWillShowNotification,
        object: nil
    )
    NotificationCenter.default.addObserver(
        self,
        selector: #selector(keyboarddidHide),
        name: UIResponder.keyboardWillHideNotification,
        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
        self.keyboardBottom.constant = keyboardHeight - self.bottomLayoutGuide.length
        DispatchQueue.main.asyncAfter(deadline: .now()+0.1, execute: {
            let bottomOffset = CGPoint(x: 0, y: self.scrlView.contentSize.height - self.scrlView.bounds.size.height)
            self.scrlView.setContentOffset(bottomOffset, animated: true)
        })
    }
}
@objc func keyboarddidHide(_ notification: Notification) {
    self.keyboardBottom.constant = 0
    
}

   override func viewWillDisappear(_ animated: Bool) {
    IQKeyboardManager.shared.enable = true
     NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

}