UIResponder+ResponderChain.swift

extension UIResponder {

    /// The responder chain from the target responder (self)
    ///     to the `UIApplication` and the app delegate
    var responderChain: [UIResponder] {
        var responderChain: [UIResponder] = []
        var currentResponder: UIResponder? = self

        while currentResponder != nil {
            responderChain.append(currentResponder!)
            currentResponder = currentResponder?.next
        }

        return responderChain
    }
}