修复权限使用目的提醒bug:用户自主按返回键遮罩层消失，定时器还会执行返回上一层页面，当用户在home页，即栈顶层，则会出现黑屏

+import 'dart:async';
 import 'dart:convert';
 import 'dart:ui';
 
@@ -60,15 +61,15 @@ typedef ClickCallback = void Function(String value);
 
 class DialogUtil {
   static showAuthorityDestination(
-      BuildContext context, String name, String title, String subTitle) {
-    Future.delayed(const Duration(seconds: 5), () {
+      BuildContext context, String name, String title, String subTitle) async {
+ 
+    Timer _timer = Timer(const Duration(seconds: 5), () {
       Navigator.of(context).pop(true);
     });
-    return showDialog(
+    final action = await showDialog(
         context: context,
         barrierDismissible: true,
-        anchorPoint:Offset(0,0),
-        
+        anchorPoint: Offset(0, 0),
         builder: (BuildContext context) {
           return StatefulBuilder(builder: (context, state) {
             // locationState = state;
@@ -114,9 +115,13 @@ class DialogUtil {
           });
         });
 
-    ;
+    print(action);
+    _timer.cancel();
+
+    return action;
   }
 
+
   //模块快过期提醒
   static showSellerVersionEdateDialog(BuildContext context,
       List<SellerVersionSunModel> showData, CustomCallBack callback,