单选按钮在颤振的底部工作表中不起作用

为了更新模态底部工作表中的单选按钮，您需要使用StatefulBuilder

showModalBottomSheet(
    context: context,
    builder: (context) => StatefulBuilder(builder: (context, state) {

并在按钮处理程序中使用新方法state（本质上是相同的 setState，只是重命名）

                        onChanged: (val) {
                          state(() {
                            selectedRadioTile = val;
                          });
                        },

所有代码都在这里：

class NutritionScreen extends StatefulWidget {
  @override
  _NutritionScreenState createState() => _NutritionScreenState();
}

class _NutritionScreenState extends State<NutritionScreen> {
  double height = 500.0;
  TextEditingController textFieldControllerAge = TextEditingController();
  TextEditingController textFieldControllerGrowth = TextEditingController();
  TextEditingController textFieldControllerWeight = TextEditingController();
  TextEditingController textFieldControllerWeightGoal = TextEditingController();
  bool _validateAge = false;
  bool _validateGrowth = false;
  bool _validateWeight = false;
  bool _validateWeightGoal = false;
  // Declare this variable
  int selectedRadioTile;

  @override
  void initState() {
    super.initState();
    selectedRadioTile = 0;
  }

  setSelectedRadioTile(int val) {
    setState(() {
      selectedRadioTile = val;
    });
  }

  @override
  void dispose() {
    textFieldControllerAge.dispose();
    textFieldControllerGrowth.dispose();
    textFieldControllerWeight.dispose();
    textFieldControllerWeightGoal.dispose();
    super.dispose();
  }

  void _modalBottomSheetMenu() {
    showModalBottomSheet(
        context: context,
        builder: (context) => StatefulBuilder(builder: (context, state) {
              return Padding(
                padding: EdgeInsets.only(
                    bottom: MediaQuery.of(context).viewInsets.bottom),
                child: new Container(
                    height: height,
                    color: Colors
                        .transparent, //could change this to Color(0xFF737373),
                    //so you don't have to change MaterialApp canvasColor
                    child: new Container(
                      decoration: new BoxDecoration(
                          color: Colors.white,
                          borderRadius: new BorderRadius.only(
                              topLeft: const Radius.circular(10.0),
                              topRight: const Radius.circular(10.0))),
                      child: SingleChildScrollView(
                          child: Column(
                        crossAxisAlignment: CrossAxisAlignment.center,
                        mainAxisSize: MainAxisSize.max,
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: <Widget>[
                          Padding(
                              padding: EdgeInsets.all(8.0),
                              child: Text(
                                "Питание",
                                textAlign: TextAlign.center,
                                style: TextStyle(
                                    color: Colors.black, fontSize: 26.0),
                              )),
                          Padding(
                              padding: EdgeInsets.all(8.0),
                              child: TextField(
                                maxLines: 1,
                                textDirection: TextDirection.ltr,
                                controller: textFieldControllerAge,
                                style: TextStyle(
                                    color: Colors.lightGreen[400],
                                    fontSize: 18.5),
                                decoration: InputDecoration(
                                  contentPadding: EdgeInsets.only(bottom: 4.0),
                                  labelText: "Возраст",
                                  errorText: _validateAge
                                      ? 'Поле должно быть заполненным'
                                      : null,
                                  alignLabelWithHint: false,
                                ),
                                keyboardType: TextInputType.phone,
                                textInputAction: TextInputAction.done,
                              )),
                          Padding(
                              padding: EdgeInsets.all(8.0),
                              child: TextField(
                                maxLines: 1,
                                textDirection: TextDirection.ltr,
                                controller: textFieldControllerGrowth,
                                style: TextStyle(
                                    color: Colors.lightGreen[400],
                                    fontSize: 18.5),
                                decoration: InputDecoration(
                                  contentPadding: EdgeInsets.only(bottom: 4.0),
                                  labelText: "Рост",
                                  errorText: _validateGrowth
                                      ? 'Поле должно быть заполненным'
                                      : null,
                                  alignLabelWithHint: false,
                                ),
                                keyboardType: TextInputType.phone,
                                textInputAction: TextInputAction.done,
                              )),
                          Padding(
                              padding: EdgeInsets.all(8.0),
                              child: TextField(
                                maxLines: 1,
                                textDirection: TextDirection.ltr,
                                controller: textFieldControllerWeight,
                                style: TextStyle(
                                    color: Colors.lightGreen[400],
                                    fontSize: 18.5),
                                decoration: InputDecoration(
                                  contentPadding: EdgeInsets.only(bottom: 4.0),
                                  labelText: "Вес",
                                  errorText: _validateWeight
                                      ? 'Поле должно быть заполненным'
                                      : null,
                                  alignLabelWithHint: false,
                                ),
                                keyboardType: TextInputType.phone,
                                textInputAction: TextInputAction.done,
                              )),
                          Padding(
                              padding: EdgeInsets.all(8.0),
                              child: TextField(
                                maxLines: 1,
                                textDirection: TextDirection.ltr,
                                controller: textFieldControllerWeightGoal,
                                style: TextStyle(
                                    color: Colors.lightGreen[400],
                                    fontSize: 18.5),
                                decoration: InputDecoration(
                                  contentPadding: EdgeInsets.only(bottom: 4.0),
                                  labelText: "Целевой вес",
                                  errorText: _validateWeightGoal
                                      ? 'Поле должно быть заполненным'
                                      : null,
                                  alignLabelWithHint: false,
                                ),
                                keyboardType: TextInputType.phone,
                                textInputAction: TextInputAction.done,
                              )),
                          RadioListTile(
                            value: 0,
                            groupValue: selectedRadioTile,
                            title: Text("Мужчина"),
                            onChanged: (val) {
                              state(() {
                                selectedRadioTile = val;
                              });
                            },
                            activeColor: Colors.lightGreen[400],
                            selected: true,
                          ),
                          RadioListTile(
                            value: 1,
                            groupValue: selectedRadioTile,
                            title: Text("Женщина"),
                            onChanged: (val) {
                              state(() {
                                selectedRadioTile = val;
                              });
                            },
                            activeColor: Colors.lightGreen[400],
                            selected: false,
                          ),
                          Container(
                              alignment: Alignment.bottomRight,
                              margin: EdgeInsets.only(top: 30),
                              child: Padding(
                                  padding: EdgeInsets.all(16.0),
                                  child: FloatingActionButton(
                                      heroTag: "tag4",
                                      backgroundColor: Color(0xffFF7070),
                                      child: Icon(Icons.check,
                                          color: Colors.white),
                                      onPressed: () {
                                        setState(() {
                                          textFieldControllerAge.text.isEmpty
                                              ? _validateAge = true
                                              : _validateAge = false;

                                          textFieldControllerGrowth.text.isEmpty
                                              ? _validateGrowth = true
                                              : _validateGrowth = false;

                                          textFieldControllerWeight.text.isEmpty
                                              ? _validateWeight = true
                                              : _validateWeight = false;

                                          textFieldControllerWeightGoal
                                                  .text.isEmpty
                                              ? _validateWeightGoal = true
                                              : _validateWeightGoal = false;
                                        });
                                        if (textFieldControllerAge
                                                .text.isNotEmpty &&
                                            textFieldControllerGrowth
                                                .text.isNotEmpty &&
                                            textFieldControllerWeight
                                                .text.isNotEmpty &&
                                            textFieldControllerWeightGoal
                                                .text.isNotEmpty)
                                          _sendDataToSecondScreen(context);
                                      }))),
                        ],
                      )),
                    )),
              );
            }));
  }

  void _sendDataToSecondScreen(BuildContext context) {
    String textAge = textFieldControllerAge.text;
    String textGrowth = textFieldControllerGrowth.text;
    String textWeight = textFieldControllerWeight.text;
    String textWeightGoal = textFieldControllerWeightGoal.text;
    Navigator.push(
        context,
        MaterialPageRoute(builder: (context) => Container()
            // MainNutrition(
            //     textAge: textAge,
            //     textGrowth: textGrowth,
            //     textWeight: textWeight,
            //     textWeightGoal: textWeightGoal),
            // Этого класса нет
            ));
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      resizeToAvoidBottomInset: false,
      backgroundColor: Color(0xff2b2b2b),
      appBar: AppBar(
        backgroundColor: Colors.lightGreen[400],
        title: Text(
          'Питание',
          style: new TextStyle(color: Colors.white),
        ),
        leading: IconButton(
          icon: Icon(Icons.arrow_back),
          color: Colors.white,
          onPressed: () => Navigator.of(context).pop(),
        ),
      ),
      body: Container(
        alignment: Alignment.center,
        margin: const EdgeInsets.only(bottom: 45.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.end,
          children: <Widget>[
            Padding(
                padding: const EdgeInsets.only(bottom: 200.0),
                child: Text(
                  "Нажми на кнопку, чтобы добавить правильный рацион питания.",
                  textAlign: TextAlign.center,
                  style: TextStyle(color: Colors.white, fontSize: 20.0),
                )),
            FloatingActionButton(
                heroTag: "tag3",
                backgroundColor: Color(0xffFF7070),
                child: Icon(Icons.add, color: Colors.white),
                onPressed: () {
                  _modalBottomSheetMenu();
                }),
          ],
        ),
      ),
    );
  }
}

资源

完整的工作示例。由于您没有提供部分代码（而且我不是 Vanga），我可以假设问题出在其他地方。

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

int selectedRadioTile = 0;

@override
void initState() {
  initState();
  selectedRadioTile = 0;
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Title"),
      ),
      body: Center(
        child: new Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            new RadioListTile(
              value: 1,
              groupValue: selectedRadioTile,
              title: Text("Radio 1"),
              onChanged: (val) {
                print("Radio Tile pressed $val");
                setState(() => selectedRadioTile = val);
              },
              activeColor: Colors.lightGreen[400],
              selected: true,
            ),
            new RadioListTile(
              value: 2,
              groupValue: selectedRadioTile,
              title: Text("Radio 2"),
              onChanged: (val) {
                print("Radio Tile pressed $val");
                setState(() => selectedRadioTile = val);
              },
              activeColor: Colors.lightGreen[400],
              selected: false,
            ),
          ],
        ),
      ),
    );
  }
}

UPD

问题是它showModalBottomSheet没有更新它的状态，为了解决这个问题，我建议看这里。实际上，您radio button正在更新它们的值，但由于没有小部件更新，showModalBottomSheet因此不会显示。这可以在视觉上和在 的帮助下看到print("Radio Tile pressed $val");。我还建议将重复的代码移到单独的方法中，这将减少您将来的时间。