Fix Mobile Navigator Error

lib/utils/navigator.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+
+class NavigatorHelper {
+  //私有构造方法
+  NavigatorHelper._internal();
+
+  factory NavigatorHelper() {
+    return _instance;
+  }
+
+  GlobalKey<NavigatorState> get navigatorKey => _navigatorKey;
+
+  BuildContext get context =>
+      NavigatorHelper().navigatorKey.currentState!.context;
+
+  static final NavigatorHelper _instance = NavigatorHelper._internal();
+
+  //保存单例
+  final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
+
+  //返回上一页
+  static void pop<T extends Object?>([T? result]) {
+    Navigator.of(NavigatorHelper().context).pop<T>(result);
+  }
+
+  //跳转到指定页面
+  static Future<T?> push<T extends Object?>(Route<T> route) {
+    return Navigator.of(NavigatorHelper().context).push(route);
+  }
+
+  //返回上一页
+  static Future<bool> maybePop<T extends Object?>( [ T? result ]) {
+    return Navigator.of(NavigatorHelper().context).maybePop<T>(result);
+  }
+}
+
+///定义全局的NavigatorHelper对象，页面引入该文件后可以直接使用
+NavigatorHelper navigatorHelper = NavigatorHelper();