我目前正在使用Alamofire，我使用枚举来描述我按照自述文件中的建议使用的API。端点表示如下:publicenumAPI{caseGetStops(stopCode:String?)caseGetPhysicalStopscaseGetLinesColorscaseGetNextDepartures(stopCode:String,departureCode:String?,linesCode:String?,destinationsCode:String?)}可选参数是互斥的:publicvarURLRequest:NSMutableURLRequest{letresult:(