ログインのcookieをwebViewに渡したりAlmofireに渡したりして使用します。

CookieManager.swift

/*
 
 Cookie Manager
 
 howto:
    load:
        let hasCookie = CookieManager().loadCookies()
    save:
        CookieManager().saveCookies()
    delete:
        CookieManager().deleteCookies()
 
 */

import UIKit
import CoreData

class CookieManager {
    
    let targetDomain = "logb.herokuapp.com"
    let dataKey = "cookie"
    
    func loadCookies() -> Bool {
        let ud: UserDefaults = UserDefaults.standard
        let data: Data? = ud.object(forKey: dataKey) as? Data
        if (data != nil){
            let cookie: HTTPCookie? = NSKeyedUnarchiver.unarchiveObject(with: data!) as? HTTPCookie
            HTTPCookieStorage.shared.setCookie(cookie!)
            return true
        } else {
            return false
        }
    }
    
    func saveCookies() {
        for cookie:HTTPCookie in HTTPCookieStorage.shared.cookies! as [HTTPCookie] {
            if cookie.domain as String == targetDomain {
                let ud: UserDefaults = UserDefaults.standard
                let data: Data = NSKeyedArchiver.archivedData(withRootObject: cookie)
                ud.set(data, forKey: dataKey)
            }
        }
    }
    
    func deleteCookies() {
        let ud: UserDefaults = UserDefaults.standard
        let data: Data? = ud.object(forKey: dataKey) as? Data
        if (data != nil) {
            ud.removeObject(forKey: dataKey)
        }
    }
}