How to detect when user changes keyboards?

Question

Is there some way to detect when the user changes keyboard types, specifically to the Emoji keyboard in this case?

Answer 1

Swift 4:

NotificationCenter.default.addObserver(self,
     selector: #selector(FirstViewController.changeInputMode(_:)),
     name: NSNotification.Name.UITextInputCurrentInputModeDidChange, object: nil)

func changeInputMode(_ notification: Notification) 
    {
        let inputMethod = UITextInputMode.activeInputModes.description
        print("keyboard changed to \(inputMethod.description)")
    }