What is he swearing at?

Question

iOS

Tell me what he doesn't like and how to fix it?

import UIKit

class Alert: NSObject {
    
    static func show(title: String, message: String, vc: UIViewController) {
        //Создание контроллера
        
        let alertCT = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        
        
        //Create Alert Action
        let okAc = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default) { (alert:UIAlertAction) -> Void in alertCT.dismissViewControllerAnimated(true, completion: nil)}
        
        //Add Alert Action to Alert Controller
        alertCT.addAction(okAc)
        
        
        //Display Alert Controller
        vc.presentedViewController(alertCT, animated: true, completion: nil)
    }

}