Flutter 我怎样才能一次只选中一个复选框

Option1 - Using a map to maintain the state

创建 map :

final Map<int, bool> _state = {};

然后，判断该索引的值是否为true/false:

return ListView.builder(itemBuilder: (context, index) {
      return CheckboxListTile(
        value: _state[index] ?? false,
        onChanged: (value) {
          setState(() {
            _state[index] = value!;
          });
        },
        title: Text(_data[index].text),
      );
    });

选项2--使用模型:

class CheckBoxModel {
  bool isChecked = false;
  String text = "";
  CheckBoxModel({required this.isChecked, required this.text});
}

然后，生成包含30个小部件的列表:

final _data = List.generate(
    30, (index) => CheckBoxModel(isChecked: false, text: "Item $index"));

现在，使用ListView.builder并基于index更新相应的值:

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

  @override
  State<Testing> createState() => _TestingState();
}

class _TestingState extends State<Testing> {
  @override
  Widget build(BuildContext context) {
    return ListView.builder(itemBuilder: (context, index) {
      return CheckboxListTile(
        value: _data[index].isChecked,
        onChanged: (value) {
          setState(() {
            _data[index].isChecked = value!;
          });
        },
        title: Text(_data[index].text),
      );
    });
  }
}

See also

Expansion tile trailing icon updates all in list on interaction with one tile. How can I only change the icon for the expanded tile?个