UIWebViewにCookieをセット・削除

セット

// 1
let storage = NSHTTPCookieStorage.sharedHTTPCookieStorage()
let cookies = NSHTTPCookieStorage.cookiesForURL(storage)(NSURL(string: host_url)!)
NSHTTPCookieStorage.sharedHTTPCookieStorage().setCookies(cookies!, forURL: host_url)

// 2
NSURL(string: host_url)!, mainDocumentURL: NSURL(string: host_url)!)
        for cookie : NSHTTPCookie in NSHTTPCookieStorage.sharedHTTPCookieStorage().cookiesForURL(NSURL(string: host_url)!) as [NSHTTPCookie] {
            NSHTTPCookieStorage.sharedHTTPCookieStorage().setCookie(cookie)
        }

削除

let storage = NSHTTPCookieStorage.sharedHTTPCookieStorage()
for cookie : NSHTTPCookie in NSHTTPCookieStorage.sharedHTTPCookieStorage().cookiesForURL(NSURL(string: url.host)!) as [NSHTTPCookie] {
    storage.deleteCookie(cookie)
}