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

Swift 4.2

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

@objc func didReceiveKeyboardNotificationObserver(_ notification: Notification) {
    let userInfo = notification.userInfo
    let keyboardBounds = (userInfo!["UIKeyboardBoundsUserInfoKey"] as! NSValue).cgRectValue
    let keyboardFrame = (userInfo!["UIKeyboardFrameEndUserInfoKey"] as! NSValue).cgRectValue
    let duration = userInfo!["UIKeyboardAnimationDurationUserInfoKey"] as! Double
    let curve = userInfo!["UIKeyboardAnimationCurveUserInfoKey"] as! Int
    let frameBegin = (userInfo!["UIKeyboardFrameBeginUserInfoKey"] as! NSValue).cgRectValue
    let centerBegin = (userInfo!["UIKeyboardCenterBeginUserInfoKey"] as! NSValue).cgPointValue
    let center = (userInfo!["UIKeyboardCenterEndUserInfoKey"] as! NSValue).cgPointValue
    let location = userInfo!["UIKeyboardIsLocalUserInfoKey"] as! Int
    println("keyboardBounds: \(keyboardBounds) \nkeyboardFrame: \(keyboardFrame) \nduration: \(duration) \ncurve: \(curve) \nframeBegin:\(frameBegin) \ncenterBegin:\(centerBegin)\ncenter:\(center)\nlocation:\(location)")
    switch notification.name {
    case UIResponder.keyboardWillShowNotification:
    // keyboardWillShowNotification
    case UIResponder.keyboardWillHideNotification:
    // keyboardWillHideNotification
    default:
        break
    }
}