#130 opt.

lib/view/page/private_key/edit.dart

@@ -5,7 +5,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
-import 'package:nil/nil.dart';
 import 'package:toolbox/core/extension/navigator.dart';
 import 'package:toolbox/core/extension/numx.dart';
 import 'package:toolbox/core/utils/misc.dart';
@@ -43,7 +42,7 @@ class _PrivateKeyEditPageState extends State<PrivateKeyEditPage>
   late PrivateKeyProvider _provider;
   late S _s;
 
-  Widget _loading = nil;
+  Widget? _loading;
 
   @override
   void initState() {
@@ -124,7 +123,7 @@ class _PrivateKeyEditPageState extends State<PrivateKeyEditPage>
           rethrow;
         } finally {
           setState(() {
-            _loading = nil;
+            _loading = null;
           });
         }
         context.pop();
@@ -196,7 +195,7 @@ class _PrivateKeyEditPageState extends State<PrivateKeyEditPage>
           icon: Icons.password,
         ),
         SizedBox(height: MediaQuery.of(context).size.height * 0.1),
-        _loading
+        _loading ?? placeholder,
       ],
     );
   }

lib/view/page/private_key/list.dart

@@ -24,7 +24,8 @@ class PrivateKeysListPage extends StatefulWidget {
   _PrivateKeyListState createState() => _PrivateKeyListState();
 }
 
-class _PrivateKeyListState extends State<PrivateKeysListPage> with AfterLayoutMixin {
+class _PrivateKeyListState extends State<PrivateKeysListPage>
+    with AfterLayoutMixin {
   late S _s;
 
   @override
@@ -115,7 +116,7 @@ class _PrivateKeyListState extends State<PrivateKeysListPage> with AfterLayoutMi
       );
     }
   }
-  
+
   @override
   FutureOr<void> afterFirstLayout(BuildContext context) {
     autoAddSystemPriavteKey();