NSNotificationCenter addObserver in Swift

Question

How do you add an observer in Swift to the default notification center? I\'m trying to port this line of code that sends a notification when the battery level changes.

Answer 1

NSNotificationCenter add observer syntax in Swift 4.0 for iOS 11

  NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

This is for keyboardWillShow notification name type. Other type can be selected from the available option

the Selector is of type @objc func which handle how the keyboard will show ( this is your user function )