NSNotificationCenter Swift 3.0 on keyboard show and hide

Swift 3:

override func viewDidLoad() {    super.viewDidLoad()    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: Notification.Name.UIKeyboardWillShow, object: nil)    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: Notification.Name.UIKeyboardWillHide, object: nil)}func keyboardWillShow(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {        print("notification: Keyboard will show")        if self.view.frame.origin.y == 0{            self.view.frame.origin.y -= keyboardSize.height        }    }}func keyboardWillHide(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {        if self.view.frame.origin.y != 0 {            self.view.frame.origin.y += keyboardSize.height        }    }}

Swift 4.2.1:

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)@objc fileprivate func keyboardWillShow(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {        // Do something with size    }}@objc fileprivate func keyboardWillHide(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {        // Do something with size    }}

Swift 4.2+

override func viewDidLoad() {    super.viewDidLoad()    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)}@objc func keyboardWillShow(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {        if self.view.frame.origin.y == 0{            self.view.frame.origin.y -= keyboardSize.height        }    }}@objc func keyboardWillHide(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {        if self.view.frame.origin.y != 0 {            self.view.frame.origin.y += keyboardSize.height        }    }}

Swift 4.2+

@vandana's answer updated to reflect changes to native Notifications in Swift 4.2.

override func viewDidLoad() {    super.viewDidLoad()    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)}@objc func keyboardWillShow(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {        print("notification: Keyboard will show")        if self.view.frame.origin.y == 0{            self.view.frame.origin.y -= keyboardSize.height        }    }}@objc func keyboardWillHide(notification: Notification) {    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {        if self.view.frame.origin.y != 0 {            self.view.frame.origin.y += keyboardSize.height        }    }}

Also, you need to use UIKeyboardFrameEndUserInfoKey to account for safeAreaInset changes introduced with iOS 11.

set keyboard notification observer in

override func viewDidLoad() {    super.viewDidLoad()    // Do any additional setup after loading the view.    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardNotification(notification:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)}

and in your function handle it

func keyboardNotification(notification: NSNotification) {  print("keyboard displayed!!")}

hope this will help you.