当我尝试使用funcobjfunc时，出现错误:Cannotinvoke'obj'withanargumentlistoftype'(message:(QueueAddable))'我对Swift类型感到困惑。Objfunc用于获取解码的具体类型。protocolQueueAddable:Encodable{varplaylistsCollection:String?{get}varplaylists:[String]?{get}}structPlaylist:QueueAddable{varplaylistsCollection:String?{return"id"}varplayl