UIViewController extension for creating UIAlertController

someAction in ViewController subclass

func newDetail(sender: UIBarButtonItem) {

        let doneAction = UIAlertAction(title: "Done", style: .Default) { (action) -> Void in
            // Do something
        }

        let firstTextFieldConfigure = { (textfield : UITextField) in
            textfield.placeholder = "Please enter the class of detail"
        }

        let secondTextFieldConfigure = {(textfield : UITextField) in
            textfield.placeholder = "Please enter the content of detail"
        }
        

        let controller = alertController("New Detail", message: nil, preferredStyle: .Alert, actions: [doneAction], textFieldConfigures: [firstTextFieldConfigure, secondTextFieldConfigure])


        presentViewController(controller, animated: true, completion: nil)
    }

UIViewController + AlertController

import UIKit

typealias textFieldConfigurationClosure = (UITextField) -> Void

extension UIViewController {

    func alertController(title : String?, message : String?, preferredStyle : UIAlertControllerStyle, actions: [UIAlertAction], textFieldConfigures: [textFieldConfigurationClosure]) -> UIAlertController {

        let alertController = UIAlertController(title: title, message: message, preferredStyle: preferredStyle)

        for action in actions {
            alertController.addAction(action)
        }

        for configureClosure in textFieldConfigures {
            alertController.addTextFieldWithConfigurationHandler(configureClosure)
        }

        return alertController

    }
}