抖动复选框在StatelessWidget中不起作用 [英] flutter checkbox not working in StatelessWidget

问题描述

这是我的课程

class Home extends StatelessWidget {

，然后复选框在这里.

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.all(20.0),
              child: Column(
                children: <Widget>[
                  TextField(
                      controller: ctrlMotherName,
                      decoration: InputDecoration(
                          labelText: "Name of Mother",
                          border: OutlineInputBorder()
                      )
                  ),
                  SizedBox(height: 10,),
                  Checkbox(
                    value: false,
                    onChanged: (bool val){

                    },
                  ),

我无法选中该复选框.当我也使用单选按钮时，也会发现相同的问题.

I can't able to check the checkbox. Same issue found when I use Radiobutton also.

推荐答案

由于要处理更改的值，因此需要使用 StatefulWidget .我提供了一个示例:

You need to use a StatefulWidget since you're dealing with changing values. I've provided an example:

class MyAppOne extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyAppOne> {
  bool _myBoolean = false;

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Checkbox(
        value: _myBoolean,
        onChanged: (value) {
          setState(() {
            _myBoolean = value; // rebuilds with new value
          });
        },
      ),
    );
  }
}

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