passforios/passKit/Extensions/UITextFieldExtension.swift

//
//  UITextFieldExtension.swift
//  pass
//
//  Created by Yishi Lin on 5/4/17.
//  Copyright © 2017 Yishi Lin. All rights reserved.
//

import Foundation
import UIKit

private var kAssociationKeyNextField: UInt8 = 0

extension UITextField {
    @IBOutlet var nextField: UITextField? {
        get {
            return objc_getAssociatedObject(self, &kAssociationKeyNextField) as? UITextField
        }
        set(newField) {
            objc_setAssociatedObject(self, &kAssociationKeyNextField, newField, .OBJC_ASSOCIATION_RETAIN)
        }
    }
}