在iOS应用程序中下载用户个人资料照片时发生崩溃:letdataPhoto=try!Data(contentsOf:photoURL,options:.mappedIfSafe)(lldb)pophotoURL▿https:/scontent.xx.fbcdn.net/v/t1.0-1/p200x200/13418946_10208553701714177_3969269576626117653_n.jpg%3Foh=add39246ec9693ecead0529ecbbbfc53&oe=5862D7ED--file:///fatalerror:'try!'expressionunex