How to add a constructor in UIViewController in Swift IOS

class ViewController: UIViewController {
    var imageURL: NSURL?
    // this is a convenient way to create this view controller without a imageURL
    convenience init() {
        self.init(imageURL: nil)
    init(imageURL: NSURL?) {
        self.imageURL = imageURL
        super.init(nibName: nil, bundle: nil)
    // if this view controller is loaded from a storyboard, imageURL will be nil
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

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