flutter - 使用 Navigator.push (MaterialPageRoute) 而不是 AlertDialog

Question

我想使用 Navigator.push (MaterialPageRoute) 而不是 AlertDialog，因为现在我认为让我的用户拥有一个完整的页面来发布内容而不是一个对话框更好，我将如何编辑我的代码来做这个？提前致谢

 appBar: AppBar(
    centerTitle: true,
    title: Text('hehe',
    style: TextStyle(fontWeight: FontWeight.bold, fontSize: 25.0),),
    actions: <Widget>[
      Padding(
        padding: const EdgeInsets.only(right: 10.0),
        child: IconButton(icon: Icon(Icons.comment),
            onPressed: () {
          showDialog(context: context,
          builder: (BuildContext context){
            return AlertDialog(
              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
              content: Form(key: formKey,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                  Padding(
                    padding: EdgeInsets.all(8.0),
                    child: TextFormField(
                      initialValue: '',
                      onSaved: (val) => board.subject = val,
                      validator: (val) => val == "" ? val: null,
                    ),
                  ),
                  Padding(
                    padding: EdgeInsets.all(8.0),
                    child: RaisedButton(
                      color: Colors.indigo,
                      child: Text(
                          'Post',
                      style: TextStyle(color: Colors.white),),
                      onPressed: () {
                        handleSubmit();
                        Navigator.of(context).pop();
                      },
                    ),
                  )
                ],
              ),
              ),
            );
          },
          );
            }
            ),
      ),
    ],
  ),

Answer 1

创建一个 StatefulWidget 子类说 MyForm。

class MyForm extends StatefulWidget {
  @override
  _MyFormState createState() => _MyFormState();
}

class _MyFormState extends State<MyForm> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("My form")),
      body: Form(
        key: formKey,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.all(8.0),
              child: TextFormField(
                initialValue: '',
                onSaved: (val) => board.subject = val,
                validator: (val) => val == "" ? val : null,
              ),
            ),
            Padding(
              padding: EdgeInsets.all(8.0),
              child: RaisedButton(
                color: Colors.indigo,
                child: Text(
                  'Post',
                  style: TextStyle(color: Colors.white),
                ),
                onPressed: () {
                  handleSubmit();
                  Navigator.of(context).pop();
                },
              ),
            )
          ],
        ),
      ),
    );
  }
}

然后在您的 onPressed 方法中像这样使用它。

onPressed: () {
  Navigator.push(context, MaterialPagerRoute(builder: (context) => MyForm()));
}

因此，当单击该按钮时，您将被导航到当前是您的表单的新页面。