title: method does not override any method from its superclass
body: <pre><code>import UIKit
  
  class LoginController: UIViewController {
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          view.backgroundColor = UIColor(r: 61, g: 91, b: 151)
      }
  
      override func preferredStatusBarStyle() -&gt; UIStatusBarStyle {
          return .lightContent
  
      }
  }
  
  extension UIColor {
  
      convenience init(r: CGFloat, g: CGFloat, b: CGFloat) {
          self.init(red: r/255, green: g/255, blue: b/255, alpha: 1)
  </code></pre>
  
  <p>whenever i change</p>
  
  <pre><code>override var preferredStatusBarStyle: UIStatusBarStyle {
          return UIStatusBarStyle.lightContent
  }
  </code></pre>
  
  <p>i get threaded error that wouldn't let my simulator load</p>