Navigation handle

  func camelFirst() -> String? {
        let item = self.matchingStrings(regex: "[^A-Z]+")
        if item.count > 0 {
            if item[0].count > 0 {
                return item[0][0]
            }
            else { return nil }
        }
        else {
            return nil
        }
    }



class func openStoryboardId(_ caller: UIViewController, id: String) -> UIViewController? {
        if let name = id.camelFirst() {
            if let currentID = caller.restorationIdentifier {
                if let current = currentID.camelFirst() {
                    if current == name {
                        return caller.storyboard?.instantiateViewController(withIdentifier: id)
                    }
                    else {
                        let storyboard = UIStoryboard(name: name.capitalized, bundle: nil)
                        return storyboard.instantiateViewController(withIdentifier: id)
                    }
                }
                else {
                    let storyboard = UIStoryboard(name: name.capitalized, bundle: nil)
                    return storyboard.instantiateViewController(withIdentifier: id)
                }
            }
            else {
                let storyboard = UIStoryboard(name: name.capitalized, bundle: nil)
                return storyboard.instantiateViewController(withIdentifier: id)
            }
        }
        else {
            return nil
        }
    }


  func openOtherView() {
        if let viewController = DTUI.openStoryboardId(self, id: "settingSettings") {
            self.navigationController?.pushViewController(viewController, animated: true)
        }
    }