swift的新手，我试图创建一个服务注册表:classServiceRegistry{staticvarinstance=ServiceRegistry()privatevarregistry=[String:AnyObject]()privateinit(){}funcregister(key:T,value:AnyObject){self.registry["\(T.self)"]=value}funcget(_:T)->AnyObject?{returnregistry["\(T.self)"]}}但不是super友好:注册:ServiceRegistry.instance.re