DrawRectExample.swift

override func draw(_ rect: CGRect) {
    StyleKit.drawCheckBox(frame: rect, mainColor: .main, isChecked: isChecked)
}

extension UIColor {
    static var main: UIColor {
        if #available(iOS 13.0, *) {
            return UIColor { (traitCollection) -> UIColor in
                if traitCollection.userInterfaceStyle == .dark {
                    return StyleKit.appMainColorDark
                }
                return StyleKit.appMainColorLight
            }
        }
        return StyleKit.appMainColorLight
    }
}