didPop()不接受flutter中的任何参数吗？

bool didPop<T extends Object>(T result)

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Page'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go Back'),
          onPressed: () {
            Navigator.pop(context, 'Hello from My Page');
          },
        ),
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home Page'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go to My Page'),
          onPressed: () async {
            final result = await Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => MyPage()),
            );
            if (result != null) {
              print(result);
            }
          },
        ),
      ),
    );
  }
}