Why override UIStatusBarStyle is not running?

Question

I try to implement lightcontent and darkcontent for my mobile apps status bar

I put override function in my viewcontroller (Xib)

   var statusBarStyle: UIStatusBarStyle = .lightContent
    
    public override var preferredStatusBarStyle: UIStatusBarStyle {
        print("this is running")
        return statusBarStyle
    }

But if i debug the process. it's not going inside override module. Is it a wrong implementatiion? How to make this things work?