UnderlinedTextField.swift

import ReactiveKit
import UIKit

class UnderlinedTextField: UITextField {

    @IBOutlet weak var underlineView: UIView!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        underlineView.backgroundColor = UIColor.lightGray
        
        // Highlight/unhighlight the underlined view when it's being edited.
        reactive.controlEvents(.editingDidBegin).map { _ in
            return UIColor.green
        }.bind(to: underlineView.reactive.backgroundColor).dispose(in: reactive.bag)
        
        reactive.controlEvents(.editingDidEnd).map { _ in
            return UIColor.lightGray
        }.bind(to: underlineView.reactive.backgroundColor).dispose(in: reactive.bag)
    }
}

Dear Alan,

I have been trying since today morning to fix this error but something is wrong. I installed cocoa and all the kits required but it still gives me this error:

/Users/.../ViewController.swift:31:54: Value of type 'Signal<UIColor, NoError>' has no member 'bind'

I