我花了很多时间研究这个问题。有类似的线程，但我不认为这是相同的情况，所以让我问你一个问题。
我想做的是在单击加号按钮时使用HookConsumerWidget中的TabController添加一个选项卡，并转到最后添加的选项卡。
但在启动时，当点击加号按钮时，我得到以下错误：
控制器的长度属性（0）与TabBar的tabs属性中存在的选项卡数（3）不匹配。

• 3是加号按钮被单击的次数。

控制器长度似乎未从零开始更改。
下面是代码：

import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:flutter_hooks/flutter_hooks.dart';

class SampleListNotifier extends StateNotifier<List<String>> {
  SampleListNotifier() : super(<String>[]);

  // 値の操作を行う
  void createSample(String title) {
    state = [...state, title];
  }
}

final sampleListProvider = StateNotifierProvider<SampleListNotifier, List<String>>(
      (ref) => SampleListNotifier(),
);

class CustomTabController extends HookConsumerWidget {
  const CustomTabController({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final samples = ref.watch(sampleListProvider);
    final controller = useTabController(initialLength: samples.length);
    final index = useState(samples.length);
    final key = GlobalKey();

    controller.addListener(() {
      index.value = controller.index;
    });

    return Scaffold(
      appBar: AppBar(
        elevation: 0,
        leading: IconButton(
            icon: const Icon(Icons.add),
            onPressed: () async {
              const result = 'test';
              if (result?.isNotEmpty ?? true) {
                ref.read(sampleListProvider.notifier).createSample(result!);
                controller.animateTo(samples.length-1);
              }
            }),
        title: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            TabBar(
              onTap: (index) {},
              controller: controller,
              isScrollable: true,
              tabs: samples
                  .map((String sample) => Tab(text: sample))
                  .toList(),
            ),
          ],
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.settings),
            onPressed: () async {
              print('pressed!');
            },
          ),
        ],
      ),
      body: TabBarView(
        key: key,
        controller: controller,
        children: samples
            .map((String sample) =>
            TabPage(key: UniqueKey() , title: sample))
            .toList(),
      ),
    );
  }
}

class TabPage extends StatelessWidget {
  const TabPage({required Key key, required this.title}) : super(key: key);
  final String title;

  @override
  Widget build(BuildContext context) {
    return Center(
        child: Text(title)
    );
  }
}

先谢了。