您可以使用ValueNotifier来侦听Page1。然后我们将覆盖Page1上的initState并清除控件。

class _MyTabsState extends State<MyTabs> {
  final ValueNotifier<bool> clearNotifier = ValueNotifier(false);

将其传递给Page1

Page1(
  clearCallback: clearNotifier,
),

通知监听器我们只是在切换值。bool值不重要，我们只需要更新它。

onPressed: () {
  clearNotifier.value = !clearNotifier.value;
},

和第1页

class Page1 extends StatefulWidget {
  final ValueNotifier clearCallback;
  const Page1({Key? key, required this.clearCallback}) : super(key: key);

  @override
  _Page1State createState() => _Page1State();
}

class _Page1State extends State<Page1> {
  @override
  void initState() {
    super.initState();
    widget.clearCallback.addListener(() {
      CleanAll();
    });
  }

测试片段

class MyTabs extends StatefulWidget {
  const MyTabs({Key? key}) : super(key: key);

  @override
  _MyTabsState createState() => _MyTabsState();
}

class _MyTabsState extends State<MyTabs> {
  final ValueNotifier<bool> clearNotifier = ValueNotifier(false);
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        DefaultTabController(
          length: 1, // length of tabs
          initialIndex: 0,
          child: Column(
            children: <Widget>[
              const TabBar(
                labelColor: Colors.green,
                unselectedLabelColor: Colors.blueGrey,
                tabs: [
                  Tab(text: 'Page 1'),
                ],
              ),
              SizedBox(
                height: 200,
                child: TabBarView(children: <Widget>[
                  Page1(
                    clearCallback: clearNotifier,
                  ),
                ]),
              ),
            ],
          ),
        ),
        ElevatedButton(
            onPressed: () {
              clearNotifier.value = !clearNotifier.value;
            },
            child: Text('Clean')),
      ],
    );
  }
}

class Page1 extends StatefulWidget {
  final ValueNotifier clearCallback;
  const Page1({Key? key, required this.clearCallback}) : super(key: key);

  @override
  _Page1State createState() => _Page1State();
}

class _Page1State extends State<Page1> {
  @override
  void initState() {
    super.initState();
    widget.clearCallback.addListener(() {
      CleanAll();
    });
  }

  TextEditingController text1 = TextEditingController();
  TextEditingController text2 = TextEditingController();

  void CleanAll() {
    text1.clear();
    text2.clear();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        TextField(
          controller: text1,
        ),
        TextField(
          controller: text2,
        ),
      ],
    );
  }
}