public protocol KeyboardSpyAgent {
    var keyboardEventsToSpyOn: [KeyboardSpyEvent] { get }
    func keyboardSpyEventProcessed(event:KeyboardSpyEvent, keyboardInfo: KeyboardSpyInfo)
}

KeyboardSpy.spy(on: self)

KeyboardSpy.unspy(on: self)

public enum KeyboardSpyEvent {
    case willShow
    case didShow
    case willHide
    case didHide
    case willChangeFrame
    case didChangeFrame
}

public class KeyboardSpyInfo: NSObject {
    public private(set) var beginFrame: CGRect!
    public private(set) var endFrame: CGRect!
    public private(set) var animationCurve: UIViewAnimationCurve!
    public private(set) var animationDuration: Double!
    public private(set) var isLocal: Bool!
    public var keyboardHeight: CGFloat
}

import KeyboardSpy

class KeyboardSpyViewController: UIViewController {
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        KeyboardSpy.spy(on: keyboardSpyView) // This can be placed anywhere
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        KeyboardSpy.unspy(on: keyboardSpyView) // This can be placed anywhere
    }
    
}

extension KeyboardSpyViewController: KeyboardSpyAgent {
    
    internal var keyboardEventsToSpyOn: [KeyboardSpyEvent] {
        return [.willShow, .willHide]
    }
    
    internal func keyboardSpyEventProcessed(event: KeyboardSpyEvent, keyboardInfo: KeyboardSpyInfo) {
        if event == .willShow {
            // Do something like moving a view above the keyboard
        } else if event == .willHide {
            // Do something like moving a view back to its original position
        }   
    }

}