swift通过字符串创建类

func addChildViewController(childVCName: String, title: String, image: String) {
        
        //获取命名空间
        
        guard let nameSpace = Bundle.main.infoDictionary![kCFBundleExecutableKey as String] as? String else {
            return
        }
        
        guard let childClass = NSClassFromString(nameSpace + "." +  childVCName) else {
            print("没有获取到对用的类")
            return
        }
        
        //将anyClass转化成控制器类型
        guard let childVCType = childClass as? UIViewController.Type else {
            return
        }
        
        //创建控制器对象
        let childVC = childVCType.init()
        childVC.title = title
        let childNav = UINavigationController(rootViewController: childVC)
        addChildViewController(childNav)
        
    }