调用停止方法 不在调用返回方法，返回方法里有删除变音文件操作

Introduce/Record/INIntroduceController.swift

@@ -296,7 +296,7 @@ class INIntroduceController: BFBaseViewController {
             return
         }
         
-        recordScreenVC.backBtnClick()
+        recordScreenVC.pause()
 
         let controller = INVideoExportController()
         controller.export.data = recordScreenVC.itemModels