Custom UIAlertController's textColor and fonts

extension UIView {
    func findDescendantViewsOfType<T: Any>(_ subViewType:T.Type) -> [T]{
        var rs = [T]()
        if self is T {
            rs.append(self as! T)
        }
        for view in self.subviews {
            rs.append(contentsOf: view.findDescendantViewsOfType(T.self))
        }
        return rs
    }
}

class SSAlertController: UIAlertController {
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews();
        //adjust alert-action's font
        let stackViews = self.view.findDescendantViewsOfType(UIStackView.self);
        if let firstStackView = stackViews.first{
            let labels = firstStackView.findDescendantViewsOfType(UILabel.self)
            for l in labels{
                l.font = SSCommonVC.getFont(size: 16)!
            }
        }
        // adjust title's font
        if let title = self.title{
            self.setValue(NSAttributedString(string: title, attributes: [NSAttributedString.Key.foregroundColor : SSCommonVC.app_deep_blue_bg,NSAttributedString.Key.font : SSCommonVC.getFont(size: 24)!]), forKey: "attributedTitle")
            
        }
        // adjust message's font
        if let msg = self.message{
            self.setValue(NSAttributedString(string: msg, attributes: [NSAttributedString.Key.foregroundColor : SSCommonVC.app_deep_blue_bg,NSAttributedString.Key.font : SSCommonVC.getFont(size: 18)!]), forKey: "attributedMessage")
        }
        //adjust alert-action's color
        self.view.tintColor = SSCommonVC.app_deep_blue_bg;
     
        
    }
    
}