How to Write Keyboard Notifications in Swift 3

How to write Keyboard notifications in Swift 3

Swift 4

override func viewDidLoad() {
    super.viewDidLoad()   
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func keyboardWillShow(notification: NSNotification) {
     print("keyboardWillShow")
}

func keyboardWillHide(notification: NSNotification){
     print("keyboardWillHide")
}

deinit {
     NotificationCenter.default.removeObserver(self)
}

You can also get keyboard info using below code inside these methods.

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil) .      

@objc func keyboardWillChange(notification: NSNotification) {
     let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
     let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
     let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
     let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
     let deltaY = targetFrame.origin.y - curFrame.origin.y
 }

How to write Keyboard notifications in Swift 4.2?

Just replace .UIResponder.keyboardDidShowNotification with UIResponder.keyboardDidShowNotification and it will solve your problem.

And final code will be:

NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardDidShow), name: UIResponder.keyboardDidShowNotification, object: nil)

Swift 3 NSNotificationCenter Keyboardwillshow/hide

Check out the updated Swift Programming Language book. Pages 1027 and 1028 are what you're looking for. It should be something like this:

func keyboardWillHide(_ notification: NSNotification) {…

Notice the additional underscore above. Also:

#selector(LoginViewController.keyboardWillHide(_:))

You also might need to add @objc(keyboardWillHideWithNotification:) to your class.

Swift 5, How do I get notifications from the keyboard

First of all, I am assuming you are listening to keyboard notification events, i.e. Notification.Name.UIKeyboardWillShow

second, it is not of type NotificationCenter it is of type Notification

to get the specific Keyboard frame you can use the UIKeyboardFrameEndUserINfoKey

more info on this enum here

example on how to get the frame inside a Notification's userInfo

  @objc
    func keyboardWillShow(notification: Notification) {
        if let keyboardFrame = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
             let keyboardFrame = keyboardFrame.cgRectValue
              //print keyboardFrame.height
        }
}

App crashing: Exception - unrecognised selector sent to instance

Three issues:

• The creation of the selector is wrong (use #selector)
• The signature of the action is wrong (missing underscore)
• The action must be marked as @objc

---

And the type in Swift is Notification without NS prefix

override func viewDidLoad() {
    super.viewDidLoad()
    // do stuff...
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
    // do other stuff...
}

    ...

@objc func keyboardWillShow(_ notification: Notification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        self.view.frame.origin.y -= keyboardSize.height
    }
}

@objc func keyboardWillHide(_ notification: Notification) {
    self.view.frame.origin.y = 0
}

...

How do we make keyboard appear below textView in swift?

One of the easy and no code of line solution is to use the following pods in your app.

IQKeyboardManger

Later you need to just import that in App Delegate and add this two lines of code in didfinishLaunching method:

  IQKeyboardManager.sharedManager().enable = true

Your problem will be solved for whole app.

For Swift 5:

IQKeyboardManager.shared.enable = true

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