Frequently used static functions for iOs app (swift 3)

Helpers.swift

import Foundation
import UIKit

struct H {
    
    static func showOneBtnAlert(_ ctx: UIViewController, header: String, msg: String) {
        
        let alert = UIAlertController(title: header, message: msg, preferredStyle: UIAlertControllerStyle.alert)
        
        alert.addAction(UIAlertAction(title: Btn.ok, style: UIAlertActionStyle.default, handler: nil))
        
        ctx.present(alert, animated: true, completion: nil)
    }
    
    static func clearSharedCookies () {
        
        let jar = HTTPCookieStorage.shared
        
        for cookie in jar.cookies! {
            jar.deleteCookie(cookie)
        }
    }
    
    static func setSharedCookies(url: URL, cookie: String) {
        
        let jar = HTTPCookieStorage.shared
        
        let cookieHeaderField = ["Set-Cookie": cookie]
        
        let cookies = HTTPCookie.cookies(withResponseHeaderFields: cookieHeaderField, for: url)
        
        jar.setCookies(cookies, for: url, mainDocumentURL: url)
    }
}