Dynamic colors in Swift. Use it for dark mode.

UIColor+System.swift

extension UIColor {
  
  	static func system(light: UIColor, dark: UIColor) -> UIColor {
        guard #available(iOS 13, *) else { return light }
      
        return UIColor { traits in
            switch traits.userInterfaceStyle {
            case .dark: return dark
            case .light: return light
            case .unspecified: return light
            @unknown default: return light
            }
        }
    }
}