add function

lib/base/ui/empty_widget.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:qinglong_app/base/theme.dart';
+
+class EmptyWidget extends ConsumerWidget {
+  const EmptyWidget({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context,WidgetRef ref) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Text(
+            "暂无数据",
+            style: TextStyle(
+              fontSize: 14,
+              color:ref.watch(themeProvider).themeColor.descColor(),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}